工学博士, 東京大学

工学修士, 電気通信大学

optical fiber communications

electromagnetic field analysis

optical waveguides

optical fibers

optical fiber sensors

optical fibre sensings

electromagnetic wave engineering

optical communications

nonlinear optics

optical communication systems and equipments

Nanotechnology/Materials, Optical engineering and photonics

Manufacturing technology (mechanical, electrical/electronic, chemical engineering), Communication and network engineering

Manufacturing technology (mechanical, electrical/electronic, chemical engineering), Electronic devices and equipment

Apr. 2023 - Present
The University of Electro-Communications, Education and research council, 評議員

Apr. 2016 - Present
The University of Electro-Communications, Department of Computer and Network Engineering, Graduate School of Informatics and Engineering, 教授

Apr. 2023 - Mar. 2024
The University of Electro-Communications, School of Informatics and Engineering, Vice Dean

Apr. 2021 - Mar. 2022
The University of Electro-Communications, School of Informatics and Engineering Cluster II Emerging Multi-interdisciplinary Engineering, Dean

Apr. 2017 - Mar. 2018
The University of Electro-Communications, 情報理工学域 先端工学基礎課程, 課程長

Apr. 2010 - Mar. 2016
The University of Electro-Communications, Department of Communication Engineering and Informatics, Graduate School of Informatics and Engineering, Faculty of Informatics and Engineering, Professor

Apr. 2011 - Mar. 2012
The University of Electro-Communications, 情報理工学部 情報・通信工学科, 学科長

Apr. 2011 - Mar. 2012
電気通信大学, 情報理工学研究科情報・通信工学専攻, 専攻長

Apr. 2009 - Mar. 2010
The University of Electro-Communications, Department of Information and Communication Engineering, Faculty of Electro-Communications, Professor

Apr. 2007 - Mar. 2009
The University of Electro-Communications, Faculty of Electro-Communications, Department of Information and Communication Engineering, 准教授

Apr. 1999 - Mar. 2007
The University of Electro-Communications, Faculty of Electro-Communications, Department of Information and Communication Engineering, 助教授

Oct. 1992 - Mar. 1999
The University of Electro-Communications, Faculty of Electro-Communications Department of Electronic Engineering, Associate Professor

Apr. 1990 - Sep. 1992
The University of Electro-Communications, Faculty of Electro-Communications Department of Electronic Engineering, 講師

30 Mar. 1990 - 29 Sep. 1991
University of Southampton, Overseas Research Fellow/Visiting Fellow

Apr. 1987 - Mar. 1990
The University of Electro-Communications, Faculty of Electro-Communications Department of Electronic Engineering, Research Associate

09 Apr. 1984 - 30 Mar. 1987
The University of Tokyo, Graduate School, Faculty of Engineering, Department of Electronic Engineering

Apr. 1982 - Mar. 1984
The University of Electro-Communications, Graduate School, Faculty of Electro Communications, Department of Applied Electronics

Apr. 1978 - Mar. 1982
The University of Electro-Communications, Faculty of Electro Communications, Department of Applied Electronics

07 Apr. 1975 - 14 Mar. 1978
東京都立府中東高等学校, 全日制普通科

Apr. 2011 - Present
光ファイバ応用技術研究専門委員会 顧問, 電子情報通信学会, Society

Apr. 2011 - Mar. 2023
マイクロ波ミリ波フォトニクス研究専門委員会 委員, 電子情報通信学会

Jan. 1998 - Mar. 2013
東京支部学生会顧問, 電子情報通信学会, Society

Apr. 2009 - Mar. 2011
マイクロ波ミリ波フォトニクス時限研究専門委員会 委員, 電子情報通信学会, Society

Apr. 1998 - Mar. 2011
光ファイバ応用技術研究専門委員会委員, 電子情報通信学会, Society

Aug. 2006 - Jan. 2007
フォトニックネットワーク適応型リンク分科会委員, 超高速フォトニックネットワーク開発推進協議会, Others

Apr. 1998 - Mar. 2003
技術評価委員会専門委員, 基盤技術研究促進センター, Others

Feb. 1996 - Jun. 2001
光計測技術調査専門委員, 電気学会, Society

Sep. 1997 - Mar. 2000
光センサ応用研究会専門委員, 一般財団法人光産業技術振興協会, Society

Apr. 1998 - Mar. 1999
「情報リテラシー」検討委員会委員, 電気系6学会「情報リテラシー」検討委員会委員, Society

May 1997 - Apr. 1998
「情報科社会の発展に向けた提言」検討委員, Others

Mar. 2011
電気通信普及財団
第26回電気通信普及財団賞(テレコムシステム技術賞)

Dec. 2005
Fourth Interrnational Conference on Optical Communications and Networks
Thailand
ICOSN2005 Good quality paper award
Thailand

Mar. 1989
電子情報通信学会学術奨励賞

A temperature-insensitive refractive index sensor based on in-line Mach–Zehnder interferometer with micro spindle structures and photonic crystal fibers
Jian Geng; Naoto Kishi
Corresponding, Optical Fiber Technology, Elsevier BV, 89, 104039-104039, Jan. 2025, Peer-reviwed, True, A high-sensitivity refractive index (RI) sensor is proposed and designed, which is an in-line Mach-Zehnder interferometer (IMZI) with a photonic crystal fiber (PCF) and multilevel micro spindle structures fabricated by the arc-discharging and tapering method. To improve the sensitivity, a tapered multimode fiber (MMF) is inserted into the PCF. The performance of RI and temperature detection has been analyzed and discussed. The maximum RI sensitivity of -2958.875 nm/RIU is achieved by detecting the NaCl solution. In addition, the maximum temperature sensitivity is 6.4 pm/degree in the range of 25 degree - 65 degree, and the maximum measurement error changes caused by temperature is -0.0170 per mille/degree. It shows that the sensor is very sensitive to RI yet insensitive to temperature.
Scientific journal, English

A simultaneous audio and temperature sensing system based on in-line Mach–Zehnder interferometer
Jian Geng; Naoto Kishi
Optical Fiber Technology, Elsevier BV, 81, 103524-103524, Dec. 2023, Peer-reviwed, True, We propose a fiber-based in-line Mach-Zehnder interferometer capable of simultaneous measurement of acoustic signals and temperature. This interferometer employs distinctive peanut-shaped junctions which are fabricated by the discharge function of an optical fiber fusion splicer. With the peanut-shaped junctions, a single-mode optical fiber(SMF), a polarization-maintaining optical fiber(PMF), and another single-mode optical fiber(SMF) are connected to form a SMF-PMF-SMF structure. By using the curvature and temperature dependencies of the sensor's extinction wavelength in the interferometer, we have achieved a highly sensitive acoustic and temperature sensor.
Scientific journal, English

Detection and Analysis of Collapsed Buildings after the Kumamoto Earthquake by Using ALOS2-PALSAR2 Data
Fang Shang; Momoko Sumida; Koki Oketani; Naoto Kishi
Last, 2023 IEEE International Geoscience and Remote Sensing Symposium(IGARSS 2023), TH3.R4.4, Jul. 2023, Peer-reviwed
International conference proceedings, English

Coniferous and broad-leaved forest distinguishing using L-band polarimetric SAR data
Fang Shang; Taiga Saito; Saya Ohi; Naoto Kishi
IEEE Transactions on Geoscience and Remote Sensing, IEEE, 59, 9, 7487-7499, Sep. 2021, Peer-reviwed, This article proposes a coniferous and broad-leaved forest distinguishing method using L-band polarimetric SAR data based on the structure-orientation parameter. The structure-orientation parameter is one of the averaged Stokes vector-based discriminators which is sensitive to the composition of equivalent horizontal and vertical structures. In the proposed method, the structure-orientation parameters is compensated by employing the scattered power information to remove the influence of the topography. The final distinguishing result is generated based on the statistical feature of the compensated parameters. The experiments using several sets of ALOS2-PALSAR2 level 1.1 data prove that the proposed method has high performance for forest-type distinguishing.
Scientific journal, English

Averaged Stokes vector features based man-made targets analysis Using POLSAR data
Fang Shang; Natsuki Fujiwara; Naoto Kishi
Last, 2021 IEEE International Geoscience and Remote Sensing Symposium(IGARSS 2021), TU1.O-11.5, Jul. 2021, Peer-reviwed
International conference proceedings, English

Stokes-vector-based discriminator for distinguishing coniferous and broad-leaved forests with L band POLSAR data
Taiga Saito; Fang Shang; Naoto Kishi
International Geoscience and Remote Sensing Symposium(IGARSS 2019), WEP1.PD1, 01 Aug. 2019, Peer-reviwed
International conference proceedings, English

Degree of polarization-based data filter for fully polarimetric synthetic aperture radar
Fang Shang; Naoto Kishi; Akira Hirose
IEEE Transactions on Geoscience and Remote Sensing, IEEE, 57, 6, 3767-3777, Jun. 2019, Peer-reviwed, A novel data filtering algorithm for fully polarimetric synthetic aperture radar (PolSAR) based on the degree of polarization (DoP) information is proposed. We define the homogeneity degree and polarization independence degree using the DoP information, and propose a feature plane to characterize the target feature. By employing the feature plane, we categorize the targets into three types and assign specific filtering policy for each type to estimate the optimal filtering window sizes. The T-matrices of fully PolSAR data are filtered using the windows with estimated optimal sizes.
Scientific journal, English

高次の四光波混合を用いたNRZ-to-RZ変換及び波長マルチキャスト
松本浩希; 來住直人
電子情報通信学会論文誌B, 電子情報通信学会, J101-B, 12, 1055-1057, 01 Dec. 2018, Peer-reviwed, NRZ-to-RZ変換と波長マルチキャストを一括で実現する方法を提案した。クロック光数を増やすことで、エラーフリーでマルチキャストされる光の数を、OOK信号では19波長、DPSK信号では10波長までに高めた。
Scientific journal, Japanese

Automatic-zooming-type window size optimization for PolSAR data Interpretation
Masanari Sugita; Naoto Kishi; Fang Shang
International Geoscience and Remote Sensing Symposium(IGARSS 2018), WEP1.PD1, 25 Jul. 2018, Peer-reviwed
International conference proceedings, English

DPSK OTDM demultiplexing using flexible pulse clock from Raman amplifier-Soliton compressor
Irneza Ismail; Naoto Kishi; Wan Zakiah; Wan Ismail; Musab Sahrim; Juliza Jamal
Advanced Science Letters, American Scientific Publishers, 24, 3, 1676-1679, Mar. 2018, Peer-reviwed, An all-optical demultiplexing of 40-Gb/s DPSK OTDM channels by using Raman-amplifier-soliton-compressor (RASC) flexible control-window is demonstrated. In comparison with other scheme, the function of RASC is not only as a control gate controller but also to amplify the signal with picosecond width-tunable output signal. Error-free operation was achieved for the proposed all-optical 1:4 demultiplexer over all time demultiplexed 10 Gb/s return-to-zero (RZ)- differential phase-shift keying (DPSK) signals with less than 2-dB power penalties at 10-9 bit-error-rate (BER). The experimental results show that this scheme is expected to be scalable toward higher bit-rates.
Scientific journal, English

Performance of an Inline RZ-DPSK Pulse Compression Using Raman Amplifier and Its Application in OTDM Tributary
Quynh Nguyen Quang Nhu; Hung Nguyen Tan; Quang Nguyen-The; Motoharu Matsuura; Naoto Kishi
IEICE TRANSACTIONS ON ELECTRONICS, IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, E99C, 2, 227-234, Feb. 2016, Peer-reviwed, We experimentally investigate the performance of a distributed Raman amplifier (DRA)-based pulse compressor for a phase modulated signal. A 10 Gb/s return-to-zero (RZ)-differential phase shift keying (DPSK) signal is compressed to picosecond range after transmission. Pulsewidth is continuously compressed in a wide range from 20 to 3.2 ps by changing the pump power of the DRA while the compressed waveforms are well-matched with sech(2) function. Error-free operations at bit-error-rate (BER) of 10(-9) are achieved for the compressed signals of various pulsewidths with low power penalties within 2.3 dB compared to the back-to-back. After the compression, the 10 Gb/s signal is used to generate a 40 Gb/s RZ-DPSK optical time division multiplexing (OTDM) signal. This 40 Gb/s OTDM signal is then successfully demultiplexed to 10 Gb/s DPSK signal by using an optical gate based on four-wave mixing (FWM) in a highly nonlinear fiber (HNLF).
Scientific journal, English

All-optical pulsewidth-tunable wavelength conversion of return-to-zero differential phase-shift keying signal
Gazi Mohammad Sharif; Quang Nguyen-The; Motoharu Matsuura; Naoto Kishi
OPTICAL REVIEW, OPTICAL SOC JAPAN, 22, 4, 553-559, Aug. 2015, Peer-reviwed, We demonstrate the wavelength conversion of return-to-zero differential phase-shift keying (RZ-DPSK) signal with the pulsewidth-tunable operation using a Raman amplifier (RA)-based ultrashort pulse compressor and a highly nonlinear fiber (HNLF)-based four-wave mixing (FWM) switch. The wavelength of the input RZ-DPSK signal is converted to new wavelengths owing to the FWM effect in HNLF. On the other hand, the pulsewidth of the wavelength-converted RZ-DPSK signal is tuned from 10 to 3 ps by using the ultrashort pulse source based on RA-based adiabatic soliton pulse compression. The bit error rate characteristics of the input RZ-DPSK and the wavelength-converted RZ-DPSK signals with different pulsewidths are measured and error-free operations are achieved in all cases. The optical spectra, autocorrelation traces, and clear and opening eye diagrams show high conversion performance with wide-range pulsewidth tunability.
Scientific journal, English

Waveform Conversion and Wavelength Multicasting with Pulsewidth Tunability Using Raman Amplification Multiwavelength Pulse Compressor
Quynh Nguyen Quang Nhu; Quang Nguyen-The; Hung Nguyen Tan; Motoharu Matsuura; Naoto Kishi
IEICE TRANSACTIONS ON ELECTRONICS, IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, E98C, 8, 824-831, Aug. 2015, Peer-reviwed, A combination of nonreturn-to-zero (NRZ)-to-return-to-zero (RZ) waveform conversion and wavelength multicasting with pulsewidth tunability is experimentally demonstrated. A NRZ data signal is injected into a highly nonlinear fiber (HNLF)-based four-wave mixing (FWM) switch with four RZ clocks compressed by a Raman amplification-based multiwavelength pulse compressor (RA-MPC). The NRZ signal is multicast and converted to RZ signals in a continuously wide pulsewidth tuning range between around 12.17 and 4.68 ps by changing the Raman pump power of the RA-MPC. Error-free operations of the converted RZ signals with different pulsewidths are achieved with negative power penalties compared with the back-to-back NRZ signal and the small variation among received powers of RZ output channels at a bit-error-rate (BER) of 10-9. The NRZ-to-RZ waveform conversion and wavelength multicasting without using the RA-MPC are also successfully implemented.
Scientific journal, English

One to Six Wavelength Multicasting of RZ-OOK Based on Picosecond-Width-Tunable Pulse Source with Distributed Raman Amplification
Irneza Ismail; Quang Nguyen-The; Motoharu Matsuura; Naoto Kishi
IEICE TRANSACTIONS ON ELECTRONICS, IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, E98C, 8, 816-823, Aug. 2015, Peer-reviwed, All-optical 1-to-6 wavelength multicasting of a 10-Gb/s picosecond-tunable-width converted return-to-zero (RZ)-on-off-keying (OOK) data signal using a wideband-parametric pulse source from a distributed Raman amplifier (DRA) is experimentally demonstrated. Width-tunable wavelength multicasting within the C-band with approximately 40.6-nm of separation with various compressed RZ data signal inputs have been proposed and demonstrated. The converted multicast pulse widths can be flexibly controlled down to 2.67 ps by tuning the Raman pump powers of the DRA. Nearly equal pulse widths at all multicast wavelengths are obtained. Furthermore, wide open eye patterns and penalties less than 1.2 dB at the 10-9 bit-error-rate (BER) level are found.
Scientific journal, English

Wide range operation of an all-optical NRZ-DPSK-to-RZ-DPSK regenerative waveform-wavelength conversion with flexible width-tunability
Irneza Ismail; Quang Nguyen-The; Motoharu Matsuura; Gazi Mohammad Sharif; Naoto Kishi
OPTICAL REVIEW, OPTICAL SOC JAPAN, 22, 3, 489-495, Jun. 2015, Peer-reviwed, For the first time, we demonstrated a wide range operation of an all-optical non-return-to-zero (NRZ)-differential-phase-shift-keying (DPSK)-to-return-to-zero (RZ)-DPSK waveform-wavelength conversion with flexible picosecond width-tunablity and regenerative functionality. The scheme is based on a Raman amplifier soliton compressor (RASC) and a fiber-based four-wave mixing (FWM) AND-gate. In the first demonstration, we demonstrated waveform-wavelength conversion of a 10-Gb/s DPSK signal without input signal degradation over 54-nm input-output wavelength ranges. The measurement results of the converted RZ-DPSK signal are pedestal-free, and its converted pulse width from 13.0 to 2.87-ps can be adjusted by tuning the Raman pump power between 0.20 and 0.90 W. An investigation of the regenerative waveform-wavelength conversion is further conducted at different Raman pump power settings over 40-km standard single-mode fibers without dispersion compensation. Error-free operation with a low power penalty less than -1.95 dB is obtained for the RZ-DPSK regenerated converted signal.
Scientific journal, English

Raman Amplifier-Soliton Compressor and Its Application to All-Channel Hybrid OTDM Demultiplexing
Irneza Ismail; Motoharu Matsuura; Naoto Kishi; Quang Nguyen-The
2015 OPTO-ELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC), IEEE, PWe.35, 2015, Peer-reviwed, An all-optical demultiplexing of 40-Gb/s hybrid OTDM channels by using Raman-amplifier-soliton-compressor-flexible control-window is demonstrated. Error-free operations with less than 1.3-dB power penalties were obtained and this scheme is expected to be scalable toward higher bit-rates.
International conference proceedings, English

Wavelength Multicasting of RZ-DPSK Signal with Tunable Pulsewidth Using Raman Amplification Pulse Compressor
Quynh Nguyen Quang Nhu; Hung Nguyen Tan; Quang Nguyen-The; Motoharu Matsuura; Naoto Kishi
2015 21ST ASIA-PACIFIC CONFERENCE ON COMMUNICATIONS (APCC), IEEE, 14-AM2-C-3, 29-32, 2015, Peer-reviwed, We have demonstrated a 4x10 Gb/s RZ-DPSK wavelength multicasting using Raman amplification-based compressor with adjustable pulsewidth down to around 7.89 ps. Bit-error-rate at 10(-9) of multicast signals are achieved with low power penalties.
International conference proceedings, English

NRZ-DPSK-to-RZ-DPSK format conversion with multiple-function using Raman adiabatic-soliton compressor
Irneza Ismail; Motoharu Matsuura; Naoto Kishi
Asia Communications and Photonics Conference (ACP2014), AF3D.7, 14 Nov. 2014, Peer-reviwed, NRZ-DPSK(nonreturn to zero differential phase-shift keying)からRZ-DPSK(return to zero DPSK) 方式に信号型式を変換する手法をラマン増幅器を用いて実現し、その特性を評価した。
International conference proceedings, English

Multichannel-mixed OOK and DPSK format transmission performance between midspan TDCM and OPC system
Irneza Ismail; Quang Nguyen-The; Motoharu Matsuura; Naoto Kishi
Asia Communications and Photonics Conference (ACP2014), ATh3A.137, 13 Nov. 2014, Peer-reviwed, on-off keying と differential phase-shift keying 方式を混合した波長多重信号の歪みを、伝送路中途に置いた位相共役波発生器を用いて一括して効果的に行う手法を実現した。
International conference proceedings, English

WDM-to-OTDM Conversion Using Supercontinuum Generation in a Highly Nonlinear Fiber
Quang Nguyen-The; Motoharu Matsuura; Naoto Kishi
IEEE PHOTONICS TECHNOLOGY LETTERS, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 26, 18, 1882-1885, Sep. 2014, Peer-reviwed, We demonstrated an all-optical wavelengthdivision- multiplexing (WDM)-to-optical-time-division-multiplexing (OTDM) conversion using spectral broadening of super continuum (SC) generation in a highly nonlinear fiber. Four 10-Gb/s WDM channels were injected into time delay blocks for controlling the timing among them, and converted to OTDM channel by the SC-based multiplexing. The SC generation had advantages of eliminated the use of any pump in the WDM-to-OTDM conversion. All OTDM demultiplexed optical signals achieved error-free performance with <2-dB power penalty at BER = 10(-9) compared with the back-to-back signal.
Scientific journal, English

All-Optical Wavelength-Shift-Free NRZ-DPSK to RZ-DPSK Format Conversion with Pulsewidth Tunability by an SOA-Based Switch
Gazi Mohammad Sharif; Quang Nguyen-The; Motoharu Matsuura; Naoto Kishi
IEICE TRANSACTIONS ON ELECTRONICS, IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, E97C, 7, 755-761, Jul. 2014, Peer-reviwed, We demonstrate an all-optical non-return-to-zero differential phase shift keying (NRZ-DPSK) to return-to-zero differential phase shift keying (RZ-DPSK) format conversion with wavelength-shift-free and pulsewidth tunable operations by using a semiconductor optical amplifier (SOA)-based switch. An NRZ-DPSK signal is injected into the SOA-based switch with an RZ clock, and is converted to RZ-DPSK signal owing to the nonlinear effects inside the SOA. In this scheme, the wavelength of the converted RZ-DPSK signal is maintained as the original wavelength of the input NRZ-DPSK signal during the format conversion. Moreover, the pulsewidth of the converted signal is tunable in a wider operating range from 30 to 60 ps. The format conversion with pulsewidth tunability is based on cross-phase modulation (XPM) and cross-gain modulation (XGM) effects in the SOA. The clear eye diagrams, optical spectra and the bit-error-rate (BER) characteristics show high conversion performance with the wide pulsewidth tuning range. For all cases of the converted RZ-DPSK signal with different pulsewidths, the receiver sensitivities at a BER of 10(-9) for the converted RZ-DPSK signal were 0.7 to 1.5 dB higher than the receiver sensitivity of the input NRZ-DPSK signal.
Scientific journal, English

Power-efficient design scheme for survivable networks with partial bandwidth path protection
Ruchaneeya Leepila; Eiji Oki; Naoto Kishi
IEICE Communications Express, IEICE, 3, 1, 1-6, Jan. 2014, Peer-reviwed, This letter proposes a design scheme for the power-efficient network with partial bandwidth path protection. The network with the proposed scheme utilizes resources efficiently, which leads to less power consumption. This scheme employs a Linear Programming (LP) approach to minimize power consumption by considering the number of active devices and capacity consumption. Simulations show that, with the partial bandwidth path protection, the proposed scheme saves more power than the conventional scheme, which minimizes the power consumption relying on capacity consumption.
Scientific journal, English

Use of state of polarization transparent scheme for polarization shift keying signal as optical phase conjugator to improve the transmission performance
Md Nur-Al-Safa Bhuiyan; Motoharu Matsuura; Hung Nguyen Tan; Naoto Kishi
OPTICAL REVIEW, OPTICAL SOC JAPAN, 21, 1, 48-53, Jan. 2014, Peer-reviwed, Transmission characteristics of polarization shift keying (PolSK) signal is experimentally demonstrated in this work. Performance degradation due to transmission is improved using optical phase conjugation (OPC) technique. The wavelength converter based on the proposed state of polarization (SOP) transparent scheme for PolSK signal is effective to use it as mid-link optical phase conjugator and which is difficult to achieve using conventional wavelength conversion scheme. It is found that for fiber transmission, the performance of both of the orthogonal SOPs of the PolSK signal is different for their respective chirping characteristics which can be optimized to be similar using proposed OPC technique. (C) 2014 The Japan Society of Applied Physics
Scientific journal, English

ALL-OPTICAL WAVEFORM SAMPLING USING RAMAN AMPLIFICATION MULTIWAVELENGTH PULSE COMPRESSOR
Q. Nguyen Quang Nhu; Q. Nguyen-The; H. Nguyen Tan; M. Matsuura; N. Kishi
2014 OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE AND AUSTRALIAN CONFERENCE ON OPTICAL FIBRE TECHNOLOGY (OECC/ACOFT 2014), IEEE, 462-464, 2014, Peer-reviwed, A 40 GSymbol/s FWM-based all-optical sampling of NRZ and arbitrary waveforms using a Raman amplification multiwavelength pulse compressor and a HLNF is realized. The reconstructed waveforms match well with input waveforms.
International conference proceedings, English

ALL-OPTICAL OTDM-TO-WDM CONVERSION BASED ON CROSS PHASE MODULATION IN HIGHLY NONLINEAR FIBER
Q. Nguyen-The; Q. Nguyen Quang Nhu; N. Kishi; M. Matsuura
2014 OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE AND AUSTRALIAN CONFERENCE ON OPTICAL FIBRE TECHNOLOGY (OECC/ACOFT 2014), IEEE, 465-466, 2014, Peer-reviwed, We have been experimentally demonstrated OTDM-to-WDM conversion from 20 Gb/s to 2 x 10 Gb/s based on cross-phase modulation in a highly nonlinear fiber. Error-free performance was achieved for all channels with power penalties below 1.5 dB.
International conference proceedings, English

MULTICHANNEL TUNABLE PULSEWIDTH NRZ-TO-RZ CONVERSION OF INTENSITY- AND PHASE-MODULATED SIGNALS USING RAMAN ADIABATIC-SOLITON COMPRESSOR
I. Ismail; Q. Nguyen-The; M. Matsuura; N. Kishi
2014 OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE AND AUSTRALIAN CONFERENCE ON OPTICAL FIBRE TECHNOLOGY (OECC/ACOFT 2014), IEEE, 554-556, 2014, Peer-reviwed, A picosecond width-tunable and pedestal-free multichannel mixed format conversion of NRZ-to-RZ intensity- and phase-modulated signals were experimentally demonstrated. Adjusting the Raman-pump power makes the width-tunable converted signals possible until 2.73-ps resulting in negative power penalties.
International conference proceedings, English

WAVELENGTH CONVERSION OF RZ-DPSK SIGNAL WITH PULSEWIDTH TUNABILITY USING FOUR WAVE MIXING AND RAMAN AMPLIFIER BASED PULSE COMPRESSOR
G. M. Sharif; Q. Nguyen-The; M. Matsuura; N. Kishi
2014 OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE AND AUSTRALIAN CONFERENCE ON OPTICAL FIBRE TECHNOLOGY (OECC/ACOFT 2014), IEEE, 583-585, 2014, Peer-reviwed, We demonstrate wavelength conversion of RZ-DPSK signal with pulsewidth tunability. In this scheme, the pulsewidth of the wavelength converted signal can be tuned in a wider operating range by using Raman amplifier based pulse compressor.
International conference proceedings, English

6-FOLD WAVELENGTH MULTICASTING USING TUNABLE-WIDTH PICOSECOND PULSE SOURCE FROM RAMAN ADIABATIC-SOLITON COMPRESSOR
I. Ismail; Q. Nguyen-The; M. Matsuura; N. Kishi
2014 OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE AND AUSTRALIAN CONFERENCE ON OPTICAL FIBRE TECHNOLOGY (OECC/ACOFT 2014), IEEE, 586-588, 2014, Peer-reviwed, All-optical 1-to-6 wavelength multicasting of 10-Gb/s RZ-OOK signal using picosecond tunable-width wideband-parametric pulse source amplifier from Raman adiabatic-soliton-compressor. Error-free operations with less than 1-dB power penalty were achieved in the representative multicast outputs.
International conference proceedings, English

ALL-OPTICAL NRZ TO RZ FORMAT CONVERSION WITH PULSE COMPRESSION BY USING ONLY ONE HIGHLY NONLINEAR FIBER
H. Sakamoto; Q. Nguyen-The; G. M. Sharif; N. Kishi
2014 OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE AND AUSTRALIAN CONFERENCE ON OPTICAL FIBRE TECHNOLOGY (OECC/ACOFT 2014), IEEE, 774-775, 2014, Peer-reviwed, An all-optical waveform conversion from NRZ-OOK to pulse width compressed RZ-OOK is achieved by using only one highly nonlinear fiber. The pulse-width of the converted RZ signal was compressed to 5.45 ps.
International conference proceedings, English

Parametric NRZ-to-RZ Wavelength Multicasting with Pulsewidth Tunability Using Raman Amplification Multiwavelength Pulse Compressor
Quynh Nguyen Quang Nhu; Quang Nguyen-The; Hung Nguyen Tan; Motoharu Matsuura; Naoto Kishi
2014 INTERNATIONAL TOPICAL MEETING ON MICROWAVE PHOTONICS (MWP) AND THE 2014 9TH ASIA-PACIFIC MICROWAVE PHOTONICS CONFERENCE (APMP), IEEE, 276-279, 2014, Peer-reviwed, A novel technique for all-optical 4x10 Gb/s NRZ-to-RZ format conversion and wavelength multicasting with pulsewidth tunability using a Raman amplification-based multiwavelength pulses compressor and a high nonlinear fiber is successfully demonstrated. The input NRZ signal is multicast and converted to RZ signals at four wave mixing products and the pulsewidths follow those of the compressed clocks. The tunable pulsewidth of RZ signals outputs are around from 4.68 ps to 12.17 ps. Error-free operations are achieved with small penalty variations among RZ outputs channels.
International conference proceedings, English

NRZ-DPSK to RZ-DPSK Format Conversion With Wavelength Shift Free and Pulsewidth Tunable Operations
Gazi Mohammad Sharif; Quang Nguyen-The; Motoharu Matsuura; Naoto Kishi
10th Conference on Lasers and Electro-Optics Pacific Rim, and the 18th OptoElectronics and Communications Conference / Photonics in Switching 2013 (CLEO-PR&OECC/PS 2013), MO1-3, Jul. 2013
International conference proceedings, English

All-Optical WDM-to-OTDM Conversion Based on Supercontinuum Generation in a Highly Nonlinear Fiber
Quang Nguyen-The; Motoharu Matsuura; Naoto Kishi
10th Conference on Lasers and Electro-Optics Pacific Rim, and the 18th OptoElectronics and Communications Conference / Photonics in Switching 2013 (CLEO-PR&OECC/PS 2013), MO1-5, Jul. 2013
International conference proceedings, English

Multichannel transmission of intensity- and phase-modulated signals by optical phase conjugation using a quantum-dot semiconductor optical amplifier
Motoharu Matsuura; Naoto Kishi
Optics Letters, 38, 10, 1700-1702, 15 May 2013, Peer-reviwed, We report the demonstration of optical phase conjugation using a quantum-dot semiconductor optical amplifier. The transmission performance of wavelength-multiplexed 10-Gbit/s intensity- and phase-modulated signals is investigated for different channel alignments. In a 100-km transmission, we have successfully achieved high transmission performance with low power penalties for all the transmitted signals. © 2013 Optical Society of America.
Scientific journal, English

All-optical polarization-insensitive non-return-to-zero-to-pulsewidth tunable return-to-zero conversion
Gazi Mohammad Sharif; Quang Nguyen-The; Motoharu Matsuura; Naoto Kishi
OPTICAL REVIEW, OPTICAL SOC JAPAN, 20, 3, 266-270, May 2013, Peer-reviwed, We demonstrate polarization-insensitive non-return-to-zero (NRZ)-to-pulsewidth tunable return-to-zero (RZ) conversion based on a Raman amplifier (RA)-based pulse compressor and a fiber-based NRZ-to-RZ converter, which consists of a polarization diversity loop. We measure the bit-error rate (BER) characteristics of the input NRZ signal and the converted RZ signals. The power penalty of less than 0.2 dB between the converted RZ signals with different power ratios proved the polarization insensitivity. Moreover, by changing the Raman pump power of the RA-based pulse compressor, the pulsewidths of the converted RZ signals were flexibly tuned from 10 to 2 ps, which proved NRZto-RZ conversion with pulsewidth tunability. In all cases, clear eye diagrams were obtained. (C) 2013 The Japan Society of Applied Physics
Scientific journal, English

Simultaneous Multichannel Transmission of Intensity- and Phase-Modulated Signals Based on Optical Phase Conjugation Using a Quantum-Dot SOA
Motoharu Matsuura; Naoto Kishi
2013 OPTICAL FIBER COMMUNICATION CONFERENCE AND EXPOSITION AND THE NATIONAL FIBER OPTIC ENGINEERS CONFERENCE (OFC/NFOEC), IEEE, OTh1C.7, 2013, Peer-reviwed, We report the first demonstration of optical phase conjugation using a quantum-dot semiconductor optical amplifier. The 100-km transmission performances of the multiplexed 10-Gb/s intensity- and phase-modulated signals are investigated for different channel alignments.
International conference proceedings, English

A novel single-mode, linearly polarized, erbium-doped fiber laser with a stabilized frequency
Yuanyue Guo; Dongjin Wang; Falin Liu; Naoto Kishi
2013 International Conference on Computer, Information and Telecommunication Systems, CITS 2013, 1-4, 2013, Peer-reviwed, We report on an experimental study of a stabilized single-mode, linearly polarized, erbium-doped fiber laser with an unique structure of double-cavities. In its linear cavity, the effect of spatial-hole burning (SHB) is eliminated to prevent multi-longitudinal-mode oscillation by using 45° Faraday rotator mirror, meanwhile, in its another polarization maintaining ring cavity, the effect of SHB induced by a stable external light and the lasing light is enhanced efficiently to suppress the mode-hopping by the polarization state control method. Consequently, a single-mode, linearly polarized operation is demonstrated with the lasing frequency shift of less than 20MHz, its linewidth less than 3.5 kHz and the degree of polarization of 99. 9%. © 2013 IEEE.
International conference proceedings, English

Energy-efficient networks with optimal traffic splitting
Ruchaneeya Leepila; Eiji Oki; Naoto Kishi
Proceedings - 2013 IEEE International Conference on Green Computing and Communications and IEEE Internet of Things and IEEE Cyber, Physical and Social Computing, GreenCom-iThings-CPSCom 2013, ?, 324-326, 2013, Peer-reviwed, This paper proposes a method to minimize the power consumption in networks while providing working paths with optimal splitting traffic and a backup path. Due to a tradeoff between energy-efficiency and survivability of networks, the reduction of power consumption for survivable networks is a required issue. In the proposed method, the problem is formalized as a Linear Programming (LP) formulation. The proportional power, which is traffic-dependent power, is determined as a power model in the formulation. The results show that the working traffic in the network without sleep mode is split with satisfying the minimum proportional power consumption. The traffic splitting reduces the total capacity. It affects to the power consumption in the survivable networks. © 2013 IEEE.
International conference proceedings, English

Energy efficient routing for transferring data sets across networks
Ruchaneeya Leepila; Eiji Oki; Naoto Kishi
IEICE Communications Express, The Institute of Electronics, Information and Communication Engineers, 1, 7, 270-274, Dec. 2012, Peer-reviwed, This letter proposes a routing scheme to send a data set in units of bits rather than bits/s by considering the predefined transfer time, the period within which the data set should be transferred from the source node to the destination node, to minimize the energy consumed. The energy consumption is minimized with an optimal transfer time. The results show that routing at the optimal transfer time is, for the data set being sent, able to reduce energy consumption at least 7.7% for the networks examined.
Scientific journal, English

All-Optical WDM-to-OTDM Conversion Using a Multiwavelength Picosecond Pulse Generation in Raman Compression
Quang Nguyen-The; Hung Nguyen Tan; Motoharu Matsuura; Naoto Kishi
IEEE PHOTONICS TECHNOLOGY LETTERS, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 24, 24, 2235-2238, Dec. 2012, Peer-reviwed, An all-optical wavelength-division-multiplexing (WDM) to optical time-division-multiplexing (OTDM) conversion is described. The scheme is based on a Raman amplification-based multiwavelength pulse compressor and fiber-based cross phase modulation switch. In this letter, we experimentally demonstrate the conversion from 4 x 10-Gb/s WDM channels to one 40-Gb/s OTDM channel with the power penalties of less than 2 dB.
Scientific journal, English

Demonstration of bufferless optical packet switch with recursive stages of parametric wavelength converter
Hung Nguyen Tan; Nattapong Kitsuwan; Motoharu Matsuura; Naoto Kishi; Eiji Oki
OPTICAL SWITCHING AND NETWORKING, ELSEVIER SCIENCE BV, 9, 4, 336-342, Nov. 2012, Peer-reviwed, We demonstrate in an experiment an optical packet switching (OPS) using recursive parametric wavelength converters (PWCs) which uses the combination of two or more PWCs for wavelength conversions. The PWCs, which are based on four-wave mixing in highly nonlinear fibers, are possible for multiple wavelength conversion, allowing a shareper-node switching scheme, and thus significantly reducing the number of wavelength converters. Detailed demonstration of a developed OPS prototype using the joint of two PWCs indicates the generation of various wavelength conversion patterns which play an important role for OPS performance. The converted signals after two stages of PWC are obtained with error-free operations and low power penalties (BER = 10(-9)) of about 2.0 dB. Numerical results also show significant improvement in packet blocking probability by the proposed recursive PWC-based OPS in comparison with the previous non-recursive schemes. (C) 2012 Elsevier B.V. All rights reserved.
Scientific journal, English

Reconfigurable All-Optical OTDM-to-WDM Conversion Using a Multiwavelength Ultrashort Pulse Source Based on Raman Compression
Hung Nguyen Tan; Quang Nguyen-The; Motoharu Matsuura; Naoto Kishi
JOURNAL OF LIGHTWAVE TECHNOLOGY, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 30, 6, 853-863, Mar. 2012, Peer-reviwed, We propose and demonstrate a reconfigurable all-optical format conversion from optical time-division multiplexing (OTDM) to wavelength division multiplexing (WDM) providing full flexibility in terms of channel spacing and wavelength allocation. The system consists of a Raman amplification-based multiwavelength pulse compressor and a parametric sampling gate. Four conventionally generated WDM 10 GHz pulse trains are compressed at the same time to around 2.5 ps and, then, used for multiwavelength sampling of a 40 Gb/s 3.49 ps OTDM signal. Simultaneous extraction of all four 10 Gb/s tributaries to WDM channels in WDM grid with tunable channel spacing is demonstrated. Controlling time delays among the WDM clock channels makes it flexible to map OTDM tributaries onto any desired wavelength order, which is also called wavelength-and time-selective function. The reconfigurable functions can be realized independently on the coming OTDM signal by simply setting corresponding parameters of the WDM synchronous pulse trains at the terminals. This is also the key for the good overall performance obtained for all demultiplexed channels. Low power penalties below 1.9 and 2.1 dB are achieved with small penalty variations, 0.3 and 0.5 dB, among channels as the OTDM tributaries are converted to WDM grid with spacing of 400 and 200 GHz, respectively.
Scientific journal, English

40-Fold 4-Channel sub-picosecond pulse compression by Raman amplification and self-phase modulation
Hung Nguyen Tan; Quang Nguyen-The; Motoharu Matsuura; Naoto Kishi
Optical Fiber Communication Conference(OFC2012), OM2C.2, Mar. 2012, Peer-reviwed
International conference proceedings, English

All-Optical WDM-to-OTDM conversion using a Raman amplification-based multi-wavelength pulse compressor
Quang Nguyen-The; Hung Nguyen Tan; Motoharu Matsuura; Naoto Kishi
Optical Fiber Communication Conference(OFC2012), OM2C.3, Mar. 2012, Peer-reviwed
International conference proceedings, English

Parallel WDM Signal Processing in Mixed NRZ and RZ Transmission Networks Using a Single Optical Gate With Multiple Switching Windows
Hung Nguyen Tan; Motoharu Matsuura; Naoto Kishi
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 18, 2, 926-934, Mar. 2012, Peer-reviwed, We propose and demonstrate in experiment a multiple switching-window optical gate (MW-OG) for applications on parallel multiwavelength processing. The proposed scheme is a multiwavelength compatible version of the conventional Sagnac interferometric switch that offers independent controllability of switching windows at different wavelengths. This feature makes possible the data format conversion from nonreturn-to-zero (NRZ) and return-to-zero (RZ) with parallel pulsewidth tunability for wavelength-division-multiplexed signals. It also leads to the multiwavelength regeneration against chromatic dispersion and amplified spontaneous emission noise for both NRZ and RZ signals over the optical sampling processes. The MW-OG is then used as inline signal regeneration in a mixed NRZ and RZ data format transmission network over standard single-mode fiber without dispersion compensation. The regeneration is carried out at a central node that works as a terminal and an intermediate for various interconnections among nodes. Transmission performances are significantly improved for all channels simultaneously by parallel pulsewidth management in accordance with their modulation formats and lightpaths.
Scientific journal, English

Generation of multi-wavelength picosecond pulses with tunable pulsewidth and channel spacing using a Raman amplification-based adiabatic soliton compressor
Quang Nguyen-The; Hung Nguyen Tan; Motoharu Matsuura; Naoto Kishi
OPTICS EXPRESS, OPTICAL SOC AMER, 20, 2, 1230-1236, Jan. 2012, Peer-reviwed, We experimentally demonstrate pulsewidth-tunable picosecond multi-wavelength pulse generation at 10 Gb/s by the use of a Raman amplification-based adiabatic soliton compressor (RA-ASC). Multi-wavelength seed pulse trains are generated by a commercially available electroabsorption modulator and then compressed by using the RA-ASC. The pulsewidths of the compressed pulses can be simultaneously controlled from 16.0 ps to 2.0 ps by adjusting Raman pump power. Operating wavelength range of our scheme are also investigated, showing the possibility for wide channel spacing operations. (C) 2012 Optical Society of America
Scientific journal, English

Polarization-insensitive NRZ-to-RZ conversion with pulsewidth tunability
Gazi Mohammad Sharif; Quang Nguyen-The; Motoharu Matsuura; Naoto Kishi
Technical Digest - 2012 17th Opto-Electronics and Communications Conference, OECC 2012, 893-894, 2012, Peer-reviwed, We present a polarization-insensitive non-return-to-zero (NRZ) to return-to-zero (RZ) conversion. In this scheme, the pulsewidth of the converted RZ signal can be flexibly tuned from 10 ps to 2 ps. © 2012 IEEE.
International conference proceedings, English

Evaluating Tradeoff between PDP and k-FDP Algorithms under Sharing Reliable Links
Ruchaneeya Leepila; Eiji Oki; Naoto Kishi
18TH ASIA-PACIFIC CONFERENCE ON COMMUNICATIONS (APCC 2012): GREEN AND SMART COMMUNICATIONS FOR IT INNOVATION, IEEE, 692-697, 2012, Peer-reviwed, This paper evaluates tradeoff between the partial disjoint path (PDP) and the k failure-disjoint path (k-FDP) algorithms for finding k disjoint paths that share reliable links, which have no failures. Adopting a suitable algorithm for each network scenario is able to save time for network operators or save cost for network providers. We provide examined data under sharing reliable links scenario for implementing survivability of networks. The PDP algorithm finds k disjoint paths with sharing reliable links. The FDP algorithm finds disjoint paths with minimum summation of two disjoint path costs. The k-FDP algorithm is extended from the original FDP algorithm. However, k-FDP takes longer time to find the disjoint paths than PDP for same cases. In this paper, computational time and summation of path costs are considered as performance indicators. The performance of both algorithms is examined using computer simulations with various network topologies. The simulation results show that the k-FDP algorithm takes a large amount of computational time to find k disjoint paths when the number of nodes increases. The PDP algorithm is able to reduce the computational time to find k disjoint paths in the networks by 99% compared to the k-FDP algorithm. However, the summation of path costs of PDP is higher when the number of required disjoint paths increases. Our comparative results assist network operators or planners to understand the tradeoff between PDP and k-FDP which in turn helps them to make an appropriate decision in network implementations.
International conference proceedings, English

OTDM Add-Drop Multiplexing Using a Raman Amplification-Based Adiabatic Soliton Compressor
Quang Nguyen-The; Hung Nguyen Tan; Motoharu Matsuura; Naoto Kishi
2012 INTERNATIONAL CONFERENCE ON ADVANCED TECHNOLOGIES FOR COMMUNICATIONS (ATC 2012), IEEE, 349-352, 2012, An optical time division multiplexing (OTDM) adddrop multiplexing using Raman amplification-based adiabatic soliton compressor (RA-ASC) and a fiber-based cross phase modulation (XPM) switch is experimentally demonstrated. A 10 Gb/s clock train is compressed by the RA-ASC and then acts as a control signal in the fiber-based XPM switch to perform the OTDM add-drop multiplexing. A 10 Gb/s data channel is dropped from a 40 Gb/s OTDM data signal and a new 10 Gb/s data channel is added in its place. Below 2-dB power penalties are obtained for all demultiplexed channels after OTDM add-drop multiplexing.
International conference proceedings, English

Multichannel NRZ-to-RZ Modulation Format Conversion Using Cross-Gain Modulation in a Semiconductor Optical Amplifier
Hung Nguyen Tan; Tomoya Katafuchi; Motoharu Matsuura; Quang Nguyen-The; Naoto Kishi
2012 INTERNATIONAL CONFERENCE ON ADVANCED TECHNOLOGIES FOR COMMUNICATIONS (ATC 2012), IEEE, 353-356, 2012, We propose the use of cross-gain modulation (XGM) for multichannel NRZ-to-RZ data format conversion in a single semiconductor optical amplifier (SOA). Four 10Gb/s WDM NRZ signals are converted simultaneously to RZ format without logic inversion. The proposed technique is advantageous over previous schemes due to its particular simplicity, polarization independency, and wavelength-shift-free operation. It maintains good performance under 16.5dB input power dynamic range, and large time and wavelength offsets between input signals and control clock.
International conference proceedings, English

Finding k Disjoint Paths in Multi-Cost Networks
R. Leepila; E. Oki; N. Kishi
The 6th Triangle Symposium on Advanced ICT (TriSAI 2011), 1, 1, 1, Aug. 2011, Peer-reviwed
International conference proceedings, English

Flexible Broadband Wavelength Conversion in Quantum-Dot Semiconductor Optical Amplifiers
Motoharu Matsuura; Naoto Kishi
IEEE PHOTONICS TECHNOLOGY LETTERS, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 23, 15, 1097-1099, Aug. 2011, Peer-reviwed, We successfully demonstrate error-free broadband wavelength conversion using cross-gain modulation in a quantum-dot semiconductor optical amplifier (QD-SOA). Because of the wide gain bandwidth of the QD-SOA, a wide gain range is available for the wavelengths of the original and converted signals. As a result, the operating wavelength of the converted signal is flexibly tuned in a 150-nm wavelength range covering the S/C/L-bands.
Scientific journal, English

Survivable multi-cost networks with k disjoint paths
Ruchaneeya Leepila; Eiji Oki; Naoto Kishi
Cyber Journals, 2011 July Edition, 26-33, Jul. 2011, Peer-reviwed
Scientific journal, English

All-Optical NRZ-to-RZ Data Format Conversion with Picosecond Duration-Tunable and Pedestal Suppressed Operations
Quang Nguyen-The; Motoharu Matsuura; Hung Nguyen Tan; Naoto Kishi
IEICE TRANSACTIONS ON ELECTRONICS, IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, E94C, 7, 1160-1166, Jul. 2011, Peer-reviwed, We demonstrate an all-optical picosecond pulse duration-tunable nonreturn-to-zero (NRZ)-to-return-to-zero (RZ) data format conversion using a Raman amplifier-based compressor and a fiber-based four-wave mixing (FWM) switch. A NRZ data signal is injected into the fiber-based FWM switch (AND gate) with a compressed RZ clock by the Raman amplifier-based compressor, and convert to RZ data signal by the fiber-based FWM switch. The compressed RZ clock train acts as a pump signal in the fiber-based FWM switch to perform the NRZ-to-RZ data format conversion. By changing the Raman pump power of the Raman amplifier-based compressor, it is possible to tune the pulse duration of the converted RZ data signal from 15 ps to 2 Ps. In all the tuning range, the receiver sensitivity at bit error rate (HER) of 10(-9) for the converted RZ data signal was about 1.3 similar to 1.7 dB better than the receiver sensitivity of the input NRZ data signal. Moreover, the pulse pedestal of the converted RZ data signals is well suppressed owing to the FWM process in the fiber-based FWM switch.
Scientific journal, English

Transmission performance improvement by inline pulsewidth management using a single SOA-based waveform converter
Hung Nguyen Tan; Motoharu Matsuura; Naoto Kishi
16th Optoelectronics and Communications Conference, 5D4-4, Jul. 2011, Peer-reviwed
International conference proceedings, English

Transmission performance investigation of PolSK signal based on optical phase conjugation using SOP transparent schem
Md. Nur-Al-Safa Bhuiyan; Motoharu Matsuura; Hung Nguyen Tan; Naoto Kishi
16th Optoelectronics and Communications Conference, 7C4-2, Jul. 2011, Peer-reviwed
International conference proceedings, English

Recursive Parametric Wavelength Conversion Scheme for Optical Packet Switch
Nattapong Kitsuwan; Hung Nguyen Tan; Motoharu Matsuura; Naoto Kishi; Eiji Oki
JOURNAL OF LIGHTWAVE TECHNOLOGY, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 29, 11, 1659-1670, Jun. 2011, Peer-reviwed, This paper proposes a scheme to increase possible patterns of wavelength-conversion for an optical packet switch (OPS) with parametric wavelength converters (PWCs) by obtaining additional converted wavelengths using the existing resources. It is called a recursive parametric wavelength conversion (RPWC) scheme. A PWC uses a pump wavelength to define the original and converted wavelengths, called wavelength conversion pairs. None of conversion pairs from any PWCs can sometime support the request, although some wavelengths at the requested output fiber are available. Therefore, packet loss occurs and several conversion pairs are wasteful. In RPWC, unused conversion pairs are used to create additional conversion pairs. The OPS allows each wavelength to be converted using combination of unused conversion pairs using more than one PWC, instead of using only a single PWC as in a conventional scheme. Simulation results show that RPWC achieves lower packet loss rate than the conventional scheme, under both uniform and non-uniform traffic. To show the feasibility of RPWC, we develop a prototype of an optical switch with RPWC and demonstrate it in experiment.
Scientific journal, English

High-Speed Wavelength Conversion of RZ-DPSK Signal Using FWM in a Quantum-Dot SOA
Motoharu Matsuura; Naoto Kishi
IEEE PHOTONICS TECHNOLOGY LETTERS, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 23, 10, 615-617, May 2011, Peer-reviwed, We demonstrate an all-optical wavelength conversion of a return-to-zero differential phase-shift keying (RZ-DPSK) signal using four-wave mixing in a quantum-dot semiconductor optical amplifier. We successfully achieved low penalty operation of 0.56 dB using 40-Gb/s RZ-DPSK signal.
Scientific journal, English

Experimental demonstration of an optical packet switch using recursive parametric wavelength conversions
Hung Nguyen Tan; Nattapong Kitsuwan; Motoharu Matsuura; Naoto Kishi; Eiji Oki
Optical Fiber Communication Conference(OFC2011), JWA011, Mar. 2011, Peer-reviwed
International conference proceedings, English

4×10 Gb/s WDM picosecond pulse source based on Raman amplification-based adiabatic soliton compression for OTDM applications
Quang Nguyen-The; Hung Nguyen Tan; Motoharu Matsuura; Naoto Kishi
TriSAI 2011 - Proceedings of Triangle Symposium on Advanced ICT 2011, 111-114, 2011, We have demonstrated a 4×10 Gb/s WDM picosecond pulse generation using adiabatic soliton compression in Raman amplifier and its application in optical time division multiplexing (OTDM) demultiplexing. Four WDM synchronous pulses are simultaneously compressed to smaller than 3-ps before all channel OTDM demultiplexing. Bit-error-rate (BER) measurement shows error-free operation of our demultiplexing scheme with less than 1.5 dB and 0.2 dBm sensitivity variation among demultiplexing channels.
International conference proceedings, English

Parallel multichannel processing by a multiple switching-window semiconductor-based switch
Hung Nguyen Tan; Motoharu Matsuura; Naoto Kishi
TriSAI 2011 - Proceedings of Triangle Symposium on Advanced ICT 2011, 115-119, 2011, We propose and demonstrate in experiment a multiple switching-window optical gate (MW-OG) for applications on parallel multiwavelength processing. The proposed scheme is a multiwavelength compatible version of the conventional Sagnac interferometric switch which offers independent controllability of switching windows at different wavelengths. The MW-OG is used as inline signal regeneration in a mixed NRZ and RZ data format transmission network over standard single-mode fiber (SSMF) without dispersion compensation. The regeneration is carried out at a central node which works as a terminal and an intermediate for various interconnections among nodes. Transmission performances are significantly improved for all channels simultaneously by parallel pulsewidth management in accordance with their modulation formats and lightpaths.
International conference proceedings, English

Broadband wavelength conversion using cross-gain modulation in quantum-dot semiconductor optical amplifiers
Motoharu Matsuura; Naoto Kishi
TriSAI 2011 - Proceedings of Triangle Symposium on Advanced ICT 2011, 165-168, 2011, We successfully demonstrate error-free broadband wavelength conversion using cross-gain modulation in a quantum-dot semiconductor optical amplifier (QD-SOA). Because of the wide gain bandwidth of the QD-SOA, a wide gain range is available for the wavelengths of the original and converted signals. As a result, the operating wavelength of the converted signal is flexibly tuned in a 150-nm wavelength range covering the S/C/L-bands.
International conference proceedings, English

Scheme to Find k Disjoint Paths in Multi-Cost.
Ruchaneeya Leepila; Eiji Oki; Naoto Kishi
Proceedings of IEEE International Conference on Communications(ICC), IEEE, 1-5, 2011, Peer-reviwed, This paper proposes a scheme to find k disjoint paths in multi-cost networks. This scheme, called the k-penalty scheme with initial arc cost matrix (KPI), penalizes the use of conflicting arcs found in previously set paths and increases the costs of these arcs in accordance with the initially given arc cost matrix. Simulations show that the KPI scheme is able to find k disjoint paths faster than the conventional scheme that uses the incrementally updated auxiliary arc cost matrix to increases the cost of conflicting arcs. Moreover, the KPI scheme yields k disjoint paths with lower total cost than the conventional scheme. © 2011 IEEE.
International conference proceedings, English

Optical packet switch with recursive parametric wavelength conversions
Nattapong Kitsuwan; Hung Nguyen Tan; Motoharu Matsuura; Naoto Kishi; Eiji Oki
IEEE International Conference on Communications, 2011, Peer-reviwed, This paper proposes a scheme to increase possible patterns of wavelength-conversion for an optical packet switch (OPS) with parametric wavelength converters (PWCs) by obtaining additional converted wavelengths using the existing resources. It is called a recursive parametric wavelength conversion (RPWC) scheme. A PWC uses a pump wavelength to define the original and converted wavelengths, called wavelength conversion pairs. None of conversion pairs from any PWCs can sometime support the original and available converted wavelength, although some wavelengths at the requested output fiber are available. Since the original wavelength is not converted, some packet losses may occur. Several conversion pairs are wasteful since they are not utilized. In RPWC scheme, unused conversion pairs are used to create additional conversion pairs. The OPS allows each wavelength to be converted using combination of unused conversion pairs using more than one PWCs, instead of using only a single PWC as in a conventional scheme. Numerical results via simulation show that the RPWC scheme achieves lower packet loss rate than the conventional scheme. To show the feasibility of the RPWC scheme, we develop a prototype of an optical switch with RPWC and demonstrate it in experiment. © 2011 IEEE.
International conference proceedings, English

Simultaneous multi channel wavelength conversion of polarization shift keying signal with different channel group-delay and state of polarization
Md. Nur-Al-Safa Bhuiyan; Motoharu Matsuura; Hung Nguyen Tan; Naoto Kishi
OPTICS COMMUNICATIONS, ELSEVIER SCIENCE BV, 284, 2, 665-669, Jan. 2011, Peer-reviwed, Simultaneous wavelength conversion of multichannel polarization shift keying (PoISK) signal using four-wave-mixing in highly non-linear fiber is demonstrated. In the proposed wavelength converter, the wavelengths of four 10-Gb/s polarization shift keying channels are simultaneously converted without any performance degradation for the converted channels. We successfully achieved high conversion performances for all the converted channels even though the input PoISK channels have different delay time and state of polarization. (C) 2010 Elsevier B.V. All rights reserved.
Scientific journal, English

Parallel WDM Regenerative Waveform Conversion for Mixed NRZ and RZ Transmission Networks Using a SOA-Based Multiple Switching-Window Optical Gate
Hung Nguyen Tan; Motoharu Matsuura; Naoto Kishi
2011 OPTICAL FIBER COMMUNICATION CONFERENCE AND EXPOSITION (OFC/NFOEC) AND THE NATIONAL FIBER OPTIC ENGINEERS CONFERENCE, OPTICAL SOC AMERICA, OWG4, 2011, Peer-reviwed, We propose and demonstrate parallel regenerative waveform conversion with tunable pulsewidths using SOA-based multiple switching-window optical-gate (MW-OG). MW-OG based inline regenerations improve performance of a mixed NRZ/RZ transmission network.
International conference proceedings, English

Broadband Wavelength Conversion with S/C/L-band Flexible Operation Using Cross-Gain-Modulation in a Single Quantum Dot SOA
Motoharu Matsuura; Naoto Kishi
2011 OPTICAL FIBER COMMUNICATION CONFERENCE AND EXPOSITION (OFC/NFOEC) AND THE NATIONAL FIBER OPTIC ENGINEERS CONFERENCE, OPTICAL SOC AMERICA, OThY6, 2011, Peer-reviwed, We experimentally demonstrated operating original and converted wavelengths flexible wavelength conversion using cross-gain-modulation in a single quantum dot semiconductor optical amplifier with covering the entire S-, C-, and L-bands. (C)2011 Optical Society of America
International conference proceedings, English

40-Gbit/s RZ-DPSK Wavelength Conversion Using Four-Wave Mixing in a Quantum Dot SOA
Motoharu Matsuura; Naoto Kishi
2011 OPTICAL FIBER COMMUNICATION CONFERENCE AND EXPOSITION (OFC/NFOEC) AND THE NATIONAL FIBER OPTIC ENGINEERS CONFERENCE, OPTICAL SOC AMERICA, JThA24, 2011, Peer-reviwed, We demonstrate, for the first time, all-optical wavelength conversion of 40-Gbit/s RZ-DPSK signal using four-wave mixing in a quantum dot semiconductor optical amplifier. We achieved error-free operations with high conversion performances. (C) 2011 Optical Society of America
International conference proceedings, English

Scheme to Find k Disjoint Paths in Multi-Cost Networks
Ruchaneeya Leepila; Eiji Oki; Naoto Kishi
2011 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS (ICC), IEEE, CQRM-01-1, 2011, Peer-reviwed, This paper proposes a scheme to find k disjoint paths in multi-cost networks. This scheme, called the k-penalty scheme with initial arc cost matrix (KPI), penalizes the use of conflicting arcs found in previously set paths and increases the costs of these arcs in accordance with the initially given arc cost matrix. Simulations show that the KPI scheme is able to find k disjoint paths faster than the conventional scheme that uses the incrementally updated auxiliary arc cost matrix to increase the cost of conflicting arcs in our examined networks. Moreover, the KPI scheme yields k disjoint paths with lower total cost than the conventional scheme.
International conference proceedings, English

Optical Packet Switch with Recursive Parametric Wavelength Conversions
Nattapong Kitsuwan; Hung Nguyen Tan; Motoharu Matsuura; Naoto Kishi; Eiji Oki
2011 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS (ICC), IEEE, ONS-06-1, 2011, Peer-reviwed, This paper proposes a scheme to increase possible patterns of wavelength-conversion for an optical packet switch (OPS) with parametric wavelength converters (PWCs) by obtaining additional converted wavelengths using the existing resources. It is called a recursive parametric wavelength conversion (RPWC). A PWC uses a pump wavelength to define the original and converted wavelengths, called wavelength conversion pairs. None of conversion pairs from any PWCs can sometime support the original and available converted wavelength, although some wavelengths at the requested output fiber are available. Since the original wavelength is not converted, some packet losses may occur. Several conversion pairs are wasteful since they are not utilized. In RPWC, unused conversion pairs are used to create additional conversion pairs. The OPS allows each wavelength to be converted using combination of unused conversion pairs using more than one PWCs, instead of using only a single PWC as in a conventional scheme. Numerical results via simulation show that RPWC achieves lower packet loss rate than the conventional scheme. To show the feasibility of RPWC, we develop a prototype of an optical switch with RPWC and demonstrate it in experiment.
International conference proceedings, English

Wavelength-and Time-Selective OTDM-to-WDM Conversion with Variable Channel Spacing in WDM Grid Using a Reconfigurable Multiwavelength Pulse Compressor
Hung Nguyen Tan; Quang Nguyen-The; Motoharu Matsuura; Naoto Kishi
2011 37TH EUROPEAN CONFERENCE AND EXHIBITION ON OPTICAL COMMUNICATIONS (ECOC 2011), IEEE, Tu.5.LeCervin.2, 2011, Peer-reviwed, We present OTDM-to-WDM conversion with channel-spacing and wavelength allocation reconfigurable in WDM-grid by using multiwavelength Raman pulse compressor. 40Gb/s OTDM are extracted with low penalties into WDM at 400GHz and 200GHz-spacing and different wavelength orders.
International conference proceedings, English

Multi-wavelength Pulse Generation Using A Raman Amplification-Based Adiabatic Soliton Compressor
Quang Nguyen-The; Hung Nguyen Tan; Motoharu Matsuura; Naoto Kishi
2011 37TH EUROPEAN CONFERENCE AND EXHIBITION ON OPTICAL COMMUNICATIONS (ECOC 2011), IEEE, We.10.P1.10, 2011, Peer-reviwed, A multi-wavelength pulse generation at 10 Gb/s using Raman amplification-based adiabatic soliton compressor is demonstrated. The duration of both compressed pulses can be simultaneously controlled from 16.0 ps to 2.0 ps by adjusting Raman pump power.
International conference proceedings, English

Enhancement of Input Power Dynamic Range for Multiwavelength Amplification and Optical Signal Processing in a Semiconductor Optical Amplifier Using Holding Beam Effect
Hung Nguyen Tan; Motoharu Matsuura; Naoto Kishi
JOURNAL OF LIGHTWAVE TECHNOLOGY, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 28, 17, 2593-2602, Sep. 2010, Peer-reviwed, We demonstrate a considerable enhancement of input power dynamic range (IPDR) for multiwavelength amplification and optical signal processing in a semiconductor optical amplifier (SOA) by using holding beam effect. The effect is used in SOA gain region at power level well below 10 dBm, which is much smaller than the required power as the setting at transparency wavelength. The IPDR is extended not only to high power range due to the reduction of nonlinear crosstalks, but also to low power range due to the compression of amplified spontaneous emission (ASE) noise. The technique is first applied to the amplification of wavelength-division multiplexed (WDM) channels using a continuous wave (CW) holding beam. The holding beam is particularly useful for the amplification of large number of channels thanks to the suppression effect of interactions among WDM channels. It is then carried out for one of extensively-used optical processing schemes, terahertz optical asymmetric demultiplexer (TOAD), for multiwavelength data format conversion without the need of an external CW light. The IPDR of TOAD reaches over 20 dB as control clock behaves simultaneously as the holding beam. We also present that the patterning effect and the impact of ASE noise on the converted signal are strongly dependent on the TOAD's switching window, which is optimized at 40% duty ratio for the largest IPDR.
Scientific journal, English

A resilent star-ring optical broadcast-and-select network with a centeralized multi-carrier light source
Yueping Cai; Motoharu Matsuura; Eiji Oki; Naoto Kishi; Tetsuya Miki
Springer Photonic Network Communications, DOI 10.1007/s11107-010-0271-1, Aug. 2010, Peer-reviwed
Scientific journal, English

Resilient Optical Broadcast-and-Select Network Using Centralized Multi-Carrier Light Source
Y. Cai; M. Matsuura; E. Oki; N. Kishi; T. Miki
14th Conference on Optical Network Design and Modeling (ONDM 2010), 1, 1, 1, Feb. 2010, Peer-reviwed
International conference proceedings, English

Polarization-insensitive and widely tunable wavelength conversion for polarization shift keying signal based on four wave mixing in highly non-linear fiber
Md. Nur-Al-Safa Bhuiyan; Motoharu Matsuura; Hung Nguyen Tan; Naoto Kishi
OPTICS EXPRESS, OPTICAL SOC AMER, 18, 3, 2467-2476, Feb. 2010, Peer-reviwed, A fiber-based polarization-insensitive and widely tunable all-optical wavelength conversion for polarization shift keying (PolSK) signal is experimentally demonstrated by means of four-wave-mixing (FWM) in highly non-linear fiber. Polarization sensitivity of our scheme is compared with the conventional one and the conversion performance of the PolSK signal is investigated. In our scheme, preservation of state of polarization (SOP) of input PolSK signal is possible on both of the converted spectral components in FWM spectrum. In addition, over 23 nm of wavelength tunable operation with high conversion performance is achieved and detailed bit-error-rate (BER) characteristics are measured for both the up-and down-converted signal. (C) 2009 Optical Society of America
Scientific journal, English

Channel-independent performance for simultaneous multichannel wavelength conversion of polarization shift keying signal with different channel group-delay and state of polarization
Md. Nur-Al-Safa Bhuiyan; Motoharu Matsuura; Hung Nguyen Tan; Naoto Kishi
TriSAI 2010 - Proceedings of Triangle Symposium on Advanced ICT 2010, 79-82, 2010, A multichannel all-optical wavelength conversion of polarization-shift keying (PolSK) signal using four-wave-mixing (FWM) in highly non-linear fiber (HNLF) is demonstrated. The proposed wavelength converter realizes similar performance of multiple converted channels for simultaneous wavelength conversion of multiple PolSK signals with each different channel group-delay and state of polarization (SOP). It is found that the signal quality of each converted channel remain almost same for both with and without decorrelation among the input channels.
International conference proceedings, English

Channel Group-Delay-and Polarization-Insensitive Wavelength Conversion of Multichannel Polarization-Shift Keying Signal
Md Nur-Al-Safa Bhuiyan; Motoharu Matsuura; Hung Nguyen Tan; Naoto Kishi
2010 CONFERENCE ON OPTICAL FIBER COMMUNICATION OFC COLLOCATED NATIONAL FIBER OPTIC ENGINEERS CONFERENCE OFC-NFOEC, IEEE, JWA50, 2010, Peer-reviwed, We experimentally demonstrate, simultaneous all-optical wavelength conversion for multichannel polarization-shift keying (PolSK) signal using four-wave-mixing in highly non-linear fiber. The proposed multichannel wavelength converter can realize channel group-delay and polarization-insensitive operation among the channels. (C) 2010 Optical Society of America
International conference proceedings, English

Performances of All-Optical Wavelength Conversion by Means of Nonlinear Polarization Rotation in an SOA for WLAN Systems Using RoF Technologies
Motoharu Matsuura; Nanang Krisdianto; Naoto Kishi
2010 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) AND QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE (QELS), IEEE, CThBB2, 2010, Peer-reviwed, We report an all-optical wavelength conversion for WLAN systems using radio-overfiber technologies. We investigate the performances and successfully achieve high conversion performances in the operating wavelength range of 60 nm. (C) 2010 Optical Society of America
International conference proceedings, English

Reduction of FWM and XGM for Dynamic Range Improvement in SOA-Based Multiwavelength Amplification Using Holding Beam
Hung Nguyen Tan; Motoharu Matsuura; Naoto Kishi
2010 15TH OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC), IEICE-INST ELECTRONICS INFORMATION & COMMUNICATION ENGINEERS, 192-+, 2010, Peer-reviwed, We demonstrate reduction of nonlinear crosstalks for dynamic range (DR) enhancement in SOA-based multiwavelength amplification using holding beam (HB). DR is improved to 18dB with extension to low- and high-power ranges by HB at 7.6dBm.
International conference proceedings, English

Wavelength-Shift-Free Multi-Channel Width-Tunable NRZ-to-RZ Modulation Format Conversion Using a Single SOA-Based Sagnac Interferometer
Hung Nguyen Tan; Motoharu Matsuura; Naoto Kishi
2010 15TH OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC), IEICE-INST ELECTRONICS INFORMATION & COMMUNICATION ENGINEERS, 208-+, 2010, Peer-reviwed, We demonstrate wavelength-shift-free multi-channel width-tunable NRZ-to-RZ modulation format conversion using single SOA-based Sagnac interferometer. Optimization of the control clock power results in the considerable improvement of receiver sensitivity and input-power dynamic range to over 20dB.
International conference proceedings, English

All-Optical Picosecond Duration-Tunable NRZ-to-RZ Data Format Conversion With Pedestal Suppression
Quang Nguyen-The; Motoharu Matsuura; Hung Nguyen Tan; Naoto Kishi
2010 15TH OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC), IEICE-INST ELECTRONICS INFORMATION & COMMUNICATION ENGINEERS, 490-+, 2010, Peer-reviwed, We demonstrate all-optical picosecond duration-tunable NRZ-to-RZ data format conversion with pedestal suppression. Adjusting the Raman pump power makes possible the duration tunability in the range between 15 ps and 2 ps.
International conference proceedings, English

Dual-Wavelength, Duration-Tunable Picosecond Pulse Generation Using Raman Amplifier-Based Compressor
Quang Nguyen-The; Hung Nguyen Tan; Motoharu Matsuura; Naoto Kishi
2010 15TH OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC), IEICE-INST ELECTRONICS INFORMATION & COMMUNICATION ENGINEERS, 682-+, 2010, Peer-reviwed, Dual-wavelength, duration-tunable picosecond pulse compression. The pulsewidth of both compressed pulses can be simultaneously controlled from 16.0 ps to 2.0 ps with a peak-to-pedestal ratio of more than 11 dB by adjusting the launched Raman pump power.
International conference proceedings, English

Wavelength Tunable Operation of the Polarization Insensitive Wavelength Conversion Based on Polarization Shift Keying Signal
Md. Nur-Al-Safa Bhuiyan; Motoharu Matsuura; Hung Nguyen Tan; Naoto Kishi
2010 15TH OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC), IEICE-INST ELECTRONICS INFORMATION & COMMUNICATION ENGINEERS, 762-763, 2010, Peer-reviwed, We demonstrate wavelength tunable operation of a polarization-insensitive wavelength converter based on highly non-linear fiber (HNLF) using polarization shift keying signal. 23-nm tuning range is achieved with high conversion performances and preserving the input state-of-polarization.
International conference proceedings, English

Raman Amplification-Based Multiwavelength Synchronous Pulse Compressor and its Application to All-Channel OTDM Demultiplexing in a Single-Parametric-Gate
Hung Nguyen Tan; Quang Nguyen-The; Motoharu Matsuura; Naoto Kishi
2010 36TH EUROPEAN CONFERENCE AND EXHIBITION ON OPTICAL COMMUNICATION (ECOC), VOLS 1 AND 2, IEEE, P1.14, 2010, Peer-reviwed, We demonstrate full OTDM demultiplexing in single-parametric-gate using Raman amplification-based multiwavelength pulse compressor. Four WDM synchronous pulses are simultaneously compressed to smaller than 3-ps before multiwavelength demultiplexing. Less than 1.5-dB penalties are obtained with 0.2-dB sensitivity variation among demultiplexed channels.
International conference proceedings, English

Multiple-channel optical signal processing with wavelength-waveform conversions, pulsewidth tunability, and signal regeneration
Hung Nguyen Tan; Motoharu Matsuura; Tomoya Katafuchi; Naoto Kishi
OPTICS EXPRESS, OPTICAL SOC AMER, 17, 25, 22960-22973, Dec. 2009, Peer-reviwed, A multiple-channel multiple-function optical signal processor (MCMF-OSP) including wavelength-waveform conversions, pulsewidth tunability, and signal regeneration is realized through AND logic gate based on optical parametric processing with a pulsewidth-tunable RZ clock pump. The proposed scheme simultaneously offers four signal processing functions which are useful in wavelength-division multiplexing (WDM) transmission systems, and at network nodes with the necessity for multiple-channel data processing. After the discussions on the concept of MCMF-OSP, a proof-of concept experiment is demonstrated on four 10 Gb/s nonreturn-to-zero (NRZ) data format channels using nonlinearities in semiconductor optical amplifier (SOA) and highly nonlinear fiber (HNLF). A wavelength and waveform conversions to return-to-zero (RZ) modulation format are obtained together with pulsewidth-tunable range from 20% to 80% duty cycles for all input signals. The converted signals inherit the timing and waveform of the RZ clock pump, thus resulting in a time regeneration and large tolerance to narrow-band optical filtering (NAOF) and fiber accumulated chromatic dispersion (CD). (C) 2009 Optical Society of America
Scientific journal, English

Design and Evaluation of an Optical Broadcast-and-Select Network Architecture With a Centralized Multicarrier Light Source
Yueping Cai; Eiji Oki; Motoharu Matsuura; Naoto Kishi; Tetsuya Miki
JOURNAL OF LIGHTWAVE TECHNOLOGY, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 27, 21, 4897-4906, Nov. 2009, Peer-reviwed, This paper presents the design and evaluation of our optical broadcast-and-select wavelength-routed network architecture that uses a centralized multicarrier light source (C-MCLS). The large number of optical carriers/wavelengths generated by the C-MCLS are distributed to all edge nodes (ENs), which select and modulate wavelengths to realize upstream transmission. To utilize wavelengths efficiently, we introduce a framework for wavelength allocation and selection (WAS). Both static and dynamic schemes are adopted for WAS and their implementations are shown. By using fixed or tunable band pass filters and periodic arrayed waveguide grating demultiplexers, wavelengths are selected and utilized by ENs in a static or dynamic manner. After considering the design parameters used in the implementations, wavelength allocation procedures are described. We evaluate the cost, power consumption and network performance of the proposed network. Numerical results show that it offers greatly reduced cost and power consumption compared to the conventional one when the number of required access wavelengths at EN becomes large. We delineate its applicable areas through cost comparisons. Blocking probabilities of static and dynamic schemes are analyzed to evaluate network performance. Numerical results show that by choosing appropriate design parameters, the dynamic scheme offers about 25% increase in admissible offered load under the specified blocking probability, compared to the static scheme. This indicates that the dynamic scheme makes the proposed network more robust against traffic fluctuations.
Scientific journal, English

Performance Analysis on Dynamics of Parallel Iterative Matching in an Input-buffered Switch
N. Kitsuwan; E. Oki; R. Rojas-Cessa; N. Kishi
15th Asia-Pasiffic Conference on Communications (APCC 2009), 1, 1, 1, Oct. 2009, Peer-reviwed
International conference proceedings, English

Nonreservation Fair Bandwidth Allocation Based on Dynamic Replacement in Optical Burst Ring Networks
Nattapong Kitsuwan; Eiji Oki; Naoto Kishi; Tetsuya Miki
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING, OPTICAL SOC AMER, 1, 5, 416-427, Oct. 2009, Peer-reviwed, This paper proposes a real-time allocation scheme for photonic networks that use wavelength division multiplexing (WDM) and optical time division multiplexing (OTDM) technologies in the backbone and ring regional networks, respectively. A frame that is used for transferring data and control information in a ring regional network takes only one round to complete data allocation processing, instead of two rounds as required by the prior reservation scheme, so that data can be transmitted immediately. The objective is to provide max-min fair share in terms of throughput with just one round. If no free space is left on the frame, the proposed scheme allows a group (some) of the newly requested data to replace some of the already allocated data to provide max-min fair share, in terms of throughput. Data replacement and defragmentation are processed in the optical domain. Simulations show that the proposed scheme maintains max-min fair share even in unbalanced traffic scenarios. The complexity of defragmentation depends on the number of delay lines needed to regenerate the original data groups. The maximum number of delay lines is determined.
Scientific journal, English

ENVIRONMENTALLY STABLE NONLINEAR OPTICAL POLARIZATION SWITCHING BY USING A NONRECIPROCAL ALL-OPTICAL CIRCUIT
Naoto Kishi; Islam Ehsan Ul
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, JOHN WILEY & SONS INC, 51, 9, 2056-2059, Sep. 2009, Peer-reviwed, We proposed and demonstrated a stable nonlinear optical polarization self-switching based on nonreciprocal nonlinear phase shift induced by self-phase modulation in optical fiber. The polarization self-switching was achieved at input power levels of around 10 mW in a nonreciprocal circuit using Faraday rotator mirrors. This nonlinear polarization switching is quite stable against polarzation fluctuation caused by environmental perturbation. (C) 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2056-2059, 2009: Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24548
Scientific journal, English

Optical Drop-Add-Drop Network Architecture with Centralized Multi-Carrier Light Source
Yueping Cai; Motoharu Matsuura; Eiji Oki; Naoto Kishi; Tetsuya Miki
IEEE COMMUNICATIONS LETTERS, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 13, 9, 700-702, Sep. 2009, Peer-reviwed, This letter proposes an optical drop-add-drop network architecture with a centralized multi-carrier light source (C-MCLS) for regional and metro network applications., In the drop-add-drop network, optical carriers generated by the G MCLS are dropped at the source nodes and used for uplink transmission. Data are added to the network after external modulations of the carriers. Data are then dropped at the destination nodes. The reconfigurable optical add/drop multiplexer (ROADM) at each node is not only used to add and drop data, but also to drop carriers, which eliminates the distributed laser diodes needed by the conventional network. Network cost analysis and numerical results show that it offers significantly lower network cost compared to the conventional network if the total number of used wavelengths in the network is large. We evaluate its optical performance through an optical signal-to-noise ratio (OSNR) analysis. We show its applicable network size in terms of fiber span length and the number of nodes under a specified bit error rate (BER) when changing the OSNR of the C-MCLS.
Scientific journal, English

Wideband wavelength-flexible all-optical signal regeneration using gain-band tunable Raman amplification and self-phase-modulation-based spectral filtering
Motoharu Matsuura; Naoto Kishi
OPTICS LETTERS, OPTICAL SOC AMER, 34, 16, 2420-2422, Aug. 2009, Peer-reviwed, We demonstrate operating wavelength-flexible all-optical signal regeneration with 80 nm wavelength range by simply controlling the pump wavelength of the Raman preamplifier and the passband of broadened signal spectral filtering. In the operating wavelength range, improvements in receiver sensitivity of more than 2.2 dB are successfully achieved. (C) 2009 Optical Society of America
Scientific journal, English

Dynamic Wavelength Allocation and Selection for Optical Network with Centralized Multi-Carrier Light Source
Y. Cai; E. Oki; M. Matsuura; N. Kishi; T. Miki
iPOP 2009, 1, 1, 1, Jun. 2009, Peer-reviwed
International conference proceedings, English

Wavelength-Shift-Free Adjustment of the Pulsewidth in Return-to-Zero On-Off Keyed Signals by Means of Pulse Compression in Distributed Raman Amplification
Motoharu Matsuura; Buddhika Praneeth Samarakoon; Naoto Kishi
IEEE PHOTONICS TECHNOLOGY LETTERS, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 21, 9-12, 572-574, May 2009, Peer-reviwed, A wavelength-shift-free adjustment of pulsewidth in return-to-zero on-off keyed signals is demonstrated by means of adiabatic pulse compression in distributed Raman amplification. The pulsewidth of output signal can be controlled by adjusting the launched pump power into the distributed Raman amplifier. We have successfully demonstrated high conversion performances with low power penalties of less than 1.0 dB at bit-error-rate = 10(-9) in a wide pulsewidth tuning range between 13.0 and 3.06 ps at 10 Gb/s.
Scientific journal, English

Simultaneous WDM-Channel NRZ to RZ Format Conversion With Wide Pulsewidth Tunability Using Nonlinearities in SOA and Fiber
Hung Nguyen Tan; Motoharu Matsuura; Tomoya Katafuchi; Naoto Kishi
2009 14TH OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC 2009), IEEE, 734-735, 2009, Peer-reviwed, We demonstrate simultaneous 4x10Gb/s all-optical pulsewidth tunable NRZ-to-RZ format conversion using nonlinearities in SOA and fiber Pulsewidth tuning range from 20ps to 80ps is obtained for RZ outputs with negative power penalties compared to NRZ.
International conference proceedings, English

Polarization-Insensitive Wavelength Conversion for Polarization Shift Keying Signal Based on Four Wave Mixing in Highly Non-linear Fiber
Md Nur-Al-Safa Bhuiyan; Motoharu Matsuura; Hung Nguyen Tan; Naoto Kishi
2009 14TH OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC 2009), IEEE, 36-37, 2009, Peer-reviwed, We demonstrate polarization insensitive all-optical wavelength conversion for polarization shift keying (PolSK) signal. Polarization sensitivity of our scheme is compared with the conventional one and the conversion performance of the PolSK signal is investigated.
International conference proceedings, English

Real-time data allocation scheme based on dynamic replacement in burst photonic networks
Nattapong Kitsuwan; Eiji Oki; Naoto Kishi; Tetsuya Miki
Proceedings - International Conference on Computer Communications and Networks, ICCCN, ON2-1, 2009, Peer-reviwed, This paper proposes a real-time allocation scheme for photonic networks that use wavelength division multiplexing (WDM) and optical time division multiplexing (OTDM) technologies in the backbone and ring regional networks, respectively. A frame that is used for transferring data and control information in a ring regional network takes only one round to complete data allocation processing, instead of two rounds as required by the prior reservation scheme, so that data can be transmitted immediately. Our challenge is to provide max-min fair share in terms of throughput with just one round. If no free space is left on the frame, the proposed scheme allows a group (some) of the newly requested data to replace some of the already allocated data to provide max-min fair share, in terms of throughput. Data replacement and de-fragmentation are processed in the optical domain. Simulations show that the proposed scheme maintains max-min fair share even in unbalanced traffic scenarios. The complexity of de-fragmentation depends on the number of delay lines needed to regenerate the original data groups. The maximum number of delay lines is determined. © 2009 IEEE.
International conference proceedings, English

Widely Wavelength Flexible Operation of All-Optical Regeneration in RZ-OOK Signals Using Gain-Band Tunable Raman Amplifier
Motoharu Matsuura; Naoto Kishi
2009 35TH EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC), VDE VERLAG GMBH, P3.05, 2009, Peer-reviwed, We demonstrate operating wavelength flexible all-optical signal regeneration with 80 nm wavelength range by simply controlling the pump wavelength of Raman amplifier and the passband of broadened signal spectrum filtering.
International conference proceedings, English

Real-time Data Allocation using Dynamic-Shared Method in Burst Photonic Network
Nattapong Kitsuwan; Tetsuya Miki; Naoto Kishi
Proceedings of the 7th International Conference on Optical Communications and Networks (ICOCN 2008), C240-C243, Dec. 2008, Peer-reviwed
International conference proceedings, English

Time-resolved chirp properties of SOAs measured with an optical bandpass filter
Motoharu Matsuura; Nozomi Iwatsu; Kei Kitamura; Naoto Kishi
IEEE Photonics Technology Letters, 20, 23, 2001-2003, 01 Dec. 2008, Peer-reviwed, Chirp properties induced by semiconductor optical amplifiers (SOAs) are investigated by a simple chirp measurement method using an optical bandpass filter. We measure the chirp properties of signals generated by an SOA-based wavelength converter at noninverted and inverted logic operations. These results demonstrate well the features of the chirp properties induced by SOA. © 2008 IEEE.
Scientific journal, English

S, C, L-band signal transmission using a widely tunable optical clock generator
Motoharu Matsuura; Masayoshi Taguchi; Naoto Kishi
OPTICS COMMUNICATIONS, ELSEVIER SCIENCE BV, 281, 21, 5423-5428, Nov. 2008, Peer-reviwed, A widely tunable optical clock pulse train generation and transmission experiments with the generated pulse train are demonstrated. The clock pulse train is generated by means of all-optical wavelength conversion using seed clock signal, probe signal, and single semiconductor optical amplifier (SOA) with the gain peak wavelength at short side. By adjusting the injected signal powers into the converter, the generated clock pulse train at the bit-rate of 10 Gb/s has high optical signal-to-noise ratio (OSNR) and low excess timing-jitter in a wide operating wavelength range. We also demonstrate 20-km transmission experiment using the generated signal in the range of 1460-1610 nm. In this experiment, we achieve transmission performances comparable to that of 1550 nm seed clock signal. (C) 2008 Elsevier B.V. All rights reserved.
Scientific journal, English

Transmission performance of a wavelength and NRZ-to-RZ format conversion with pulsewidth tunability by combination of SOA- and fiber-based switches
Hung Nguyen Tan; Motoharu Matsuura; Naoto Kishi
OPTICS EXPRESS, OPTICAL SOC AMER, 16, 23, 19063-19071, Nov. 2008, Peer-reviwed, An all-optical signal processing scheme coupling wavelength conversion and NRZ-to-RZ data format conversion with pulsewidth tunability into one by combination of SOA- and fiber-based switches, is experimentally demonstrated, and its transmission performance is investigated. An 1558 nm NRZ data signal is converted to RZ data format at 1546 nm with widely tunable pulsewidth from 20 % to 80 % duty cycle at the bit-rate of 10 Gb/s. The investigation on transmission performance of the converted RZ signals at each different pulsewidth is carried out over various standard single-mode fiber (SSMF) links up to 65 km long without dispersion compensation. The results clarify a significant improvement on transmission performance of converted signal in comparison with the conventional NRZ signal through tunable pulsewidth management and show the existence of an optimal pulsewidth for the RZ data format at each transmission distance with particular cumulative dispersion. The optimal pulsewidths of the converted RZ signal and its corresponding power penalties against the NRZ signal are also investigated in different SSMF links. (C) 2008 Optical Society of America
Scientific journal, English

Real-time reservation using dynamic-shared method in burst photonic network Seventh International Conference on Optical Communications and Networks (ICOCN2008)
Nattapong Kitsuwan; Tetsuya Miki; Naoto Kishi
Seventh International Conference on Optical Communications and Networks (ICOCN2008), *****, Nov. 2008, Peer-reviwed
International conference proceedings, English

Optical broadcast-and-select network architecture with centralized multi-carrier light source
Yueping Cai; Motoharu Matsuura; Eiji Oki; Naoto Kishi; Testuya Miki
IEICE ELECTRONICS EXPRESS, IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, 5, 19, 796-801, Oct. 2008, Peer-reviwed, We propose an optical broadcast-and-select network architecture with centralized multi-carrier light source (C-MCLS). It enables all network nodes access a large number of optical carriers in a cost-effective manner through dynamic optical broadcast and select. Cost analysis and numerical results show that it greatly reduces the light source cost compared with the conventional one, as the number of required access wavelengths at network nodes becomes large. We also show its cost-effective areas in different cases of cost calculation. The obtained results indicate that it is very promising for future regional/metro networks, which demand a large number of wavelengths.
Scientific journal, English

Optimal Capacity per Channel for WDM Transmission System with Several Modulation Formats
Hideki Oku; Naoto Kishi; Tetsuya Miki
Proceedings of ILLMC2008, 24-TP4-9, Apr. 2008, Peer-reviwed
International conference proceedings, English

Survivable Optical Broadcast-and-Select Network with Centralized Multi-Carrier Light Source
Yueping Cai; Motoharu Matsuura; Naoto Kishi; Tetsuya Miki
2008 14TH ASIA-PACIFIC CONFERENCE ON COMMUNICATIONS, (APCC), VOLS 1 AND 2, IEEE, 387-391, 2008, Peer-reviwed, This paper presents a survivable optical broadcast-and-select network architecture with centralized multi-carrier light source for regional or metro-core network applications. A large number of optical carriers generated by the single multi-carrier light source are shared and utilized by all edge nodes of the regional network through dynamic wavelength/waveband broadcast and select. The design of this network architecture aims to reduce network cost and increase network survivability. Combined with optical couplers and 1 x 2 optical switches based protection architecture, the proposed network enables a fast failure-recovery scheme design. It recovers the network from different fiber cut failures in a fast and cost-effective way. The recovery time analysis and calculations under different situations are carried out to evaluate the performance of the proposed failure-recovery scheme. Results show that the recovery time is largely impacted by the switching time of 1 x 2 optical switches and it is small enough to meet the standard 50 ms requirements with 1 ms switches.
International conference proceedings, English

Pulsewidth Tunable NRZ-to-RZ Data Format Conversion by Combination of SOA- and Fiber-Based Switches
Hung Nguyen Tan; Motoharu Matsuura; Naoto Kishi
2008 JOINT CONFERENCE OF THE OPTO-ELECTRONICS AND COMMUNICATIONS CONFERENCE AND THE AUSTRALIAN CONFERENCE ON OPTICAL FIBRE TECHNOLOGY, VOLS 1 AND 2, IEEE, 51-52, 2008, Peer-reviwed, We demonstrate a pulsewidth tunable NRZ-to-RZ data format conversion by combination of SOA- and fiber-based switches. The negative-power penalties of the converted signals for 0-km and 20-km SMF transmission are achieved for various pulsewidths at 10 Gb/s.
International conference proceedings, English

Chirp properties induced by SOA for amplification and wavelength conversions measured by an optical tunable bandpass filter
Motoharu Matsuura; Nozomi Iwatsu; Kei Kitamura; Naoto Kishi
2008 JOINT CONFERENCE OF THE OPTO-ELECTRONICS AND COMMUNICATIONS CONFERENCE AND THE AUSTRALIAN CONFERENCE ON OPTICAL FIBRE TECHNOLOGY, VOLS 1 AND 2, IEEE, 181-182, 2008, Peer-reviwed, Chirp properties induced by a semiconductor optical amplifier (SOA) are investigated by simple chirp measurement method using an optical bandpass filter. We compare the properties among signal amplification and two types of wavelength conversions.
International conference proceedings, English

Modeling and Architecture Design of Novel Optical Broadcast-and-Select Network with Centralized Multi-carrier Light Source
Yueping Cai; Motoharu Matsuura; Naoto Kishi; Tetsuya Miki
2008 JOINT CONFERENCE OF THE OPTO-ELECTRONICS AND COMMUNICATIONS CONFERENCE AND THE AUSTRALIAN CONFERENCE ON OPTICAL FIBRE TECHNOLOGY, VOLS 1 AND 2, IEEE, 622-623, 2008, Peer-reviwed, We present the modeling and architecture design of proposed optical regional networks with centralized multi-carrier light source. The analysis results show that our proposal achieves better network performance and lower cost than traditional ones.
International conference proceedings, English

Pulsewidth-tunable all-optical signal conversion by pulse compression in distributed raman amplifier
Motoharu Matsuura; Buddhika Praneeth Samarakoon; Naoto Kishi
Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS, 131-132, 2008, Peer-reviwed, We have successfully demonstrated wavelength-shift-free, widely pulsewidth-tunable, all-optical signal conversion with low power penalties of less than 1.0 dB in a wide pulsewidth tuning range between 13.0 ps and 3.06 ps at 10 Gbit/s. ©2008 IEEE.
International conference proceedings, English

S, C, L-band signal transmission by widely tunable pulse source using a single SOA-based wavelength converter
Motoharu Matsuura; Masayoshi Taguchi; Naoto Kishi
Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS, 328-329, 2008, Peer-reviwed, A widely tunable pulse source using broadband SOA-based wavelength converter is proposed. We demonstrate 20-km transmission experiment using the generated signal in the wavelength range of 1460 nm to 1610 nm. ©2008 IEEE.
International conference proceedings, English

Discrete wavelength tuning characteristics of a single-frequency fiber laser with dual-wavelength external frequency-stable light injection
Motoharu Matsuura; Kaoru Mori; Naoto Kishi
OPTICS EXPRESS, OPTICAL SOC AMER, 15, 25, 16316-16321, Dec. 2007, Peer-reviwed, We investigate discrete wavelength tuning characteristics of a single-frequency fiber laser locked to either of two external lights. Frequency locking is achieved by the cooperatively induced spatial-hole burning (SHB) of a saturable absorber in the laser cavity. We show that lasing frequency is well locked to either of the two external lights when the lasing wavelength of the fiber laser is adjusted to the corresponding wavelength of the external light by tuning the bandpass filter in the laser cavity. The locked frequency stability of the fiber laser is as high as that of the employed external light source. (c) 2007 Optical Society of America.
Scientific journal, English

RF output power improvement using heterodyne technique for radio-on-fiber down-link transmission system eliminating electric power supply at bass station
Motoharu Matsuura; Taichiro Okabe; Naoto Kishi; Tetsuya Miki
12th Optoelectronics and Communications Conference/16th International Conference on Integrated Optics and Optical Fibre Communications(IOOC/OECC2007), 11P-1, Jul. 2007, Peer-reviwed
International conference proceedings, English

Frequency locking of a single-frequency fiber laser with dual-wavelength external frequency-stabilized light source
Kaoru Mori; Motoharu Matsuura; Naoto Kishi
12th Optoelectronics and Communications Conference/16th International Conference on Integrated Optics and Optical Fibre Communications(IOOC/OECC2007), 12C2-3, Jul. 2007, Peer-reviwed
International conference proceedings, English

A novel star-ring optical regional network architecture with dynamic wavelength/waveband broadcast and select
Yueping Cai; Motoharu Matsuura; Naoto Kishi; Tetsuya Miki
12th Optoelectronics and Communications Conference/16th International Conference on Integrated Optics and Optical Fibre Communications(IOOC/OECC2007), 12P-3, Jul. 2007, Peer-reviwed
International conference proceedings, English

Proposal for simple bit timing synchronization technique of mapping optical burst signals for optical burst switching
Ayako Iwaki; Motoharu Matsuura; Naoto Kishi; Tetsuya Miki
12th Optoelectronics and Communications Conference/16th International Conference on Integrated Optics and Optical Fibre Communications(IOOC/OECC2007), 13P-3, Jul. 2007, Peer-reviwed
International conference proceedings, English

Signal waveform analysis for all-optical waveform converter by adjusting the power and the wavelength of assist light
Motoharu Matsuura; Yuki Kishikawa; Naoto Kishi; Tetsuya Miki
IEICE ELECTRONICS EXPRESS, IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, 4, 12, 369-374, Jun. 2007, Peer-reviwed, We analyze signal waveform generated by a semiconductor optical amplifer (SOA)-based switch with a delayed-interferometric (DI) configuration by controlling an assist light under gain or transparent wavelength. To take advantage of the rectangular-shape waveform generated by the switch, we investigate and optimize the waveform quality by means of both Q-factor and concordance rate to rectangular-shape of the converted waveform.
Scientific journal, English

Broadband regenerative wavelength conversion and multicasting using triple-stage semiconductor-based wavelength converters
Motoharu Matsuura; Naoto Kishi; Tetsuya Miki
OPTICS LETTERS, OPTICAL SOC AMER, 32, 9, 1026-1028, May 2007, Peer-reviwed, We demonstrate broadband wavelength conversion with a 320 nm operating wavelength range and channel spacing flexible wavelength-division-multiplexing (WDM) multicasting from a 1550 ran signal using a triple-stage cascaded semiconductor-optical-amplifier-based wavelength converter. (c) 2007 Optical Society of America.
Scientific journal, English

Ultrawideband wavelength conversion using cascaded SOA-based wavelength converters
Motoharu Matsuura; Naoto Kishi; Tetsuya Miki
JOURNAL OF LIGHTWAVE TECHNOLOGY, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 25, 1, 38-45, Jan. 2007, Peer-reviwed, An all-optical wavelength converter with a large wavelength hopping range is proposed and demonstrated. This converter consists of multistage cascaded wavelength converters using semiconductor optical amplifiers each with different gain band. Each of the cascaded wavelength converters enables us to perform both noninverted (NIV) and inverted (IV) operations. Conversion performance is compared at NIV and IV operations in terms of static characteristics as a function of input/output power of the converter. While good conversion performances are achieved at both operations, the IV wavelength conversion has better cascadability to obtain a high-quality converted signal for the cascaded scheme. Moreover, signal amplitude regeneration is demonstrated by repeating the IV wavelength conversion. Finally, we successfully demonstrate, for the first time, ultrawideband wavelength conversion, including over 300-nm wavelength hopping to the shorter wavelength side with a triple-stage cascaded wavelength converter.
Scientific journal, English

Channel-spacing tunable and multiwavelength switchable erbium-doped fiber laser
Feroz Ahmed; Naoto Kishi; Tetsuya Miki; Muhammad Golam Mostqfa; Abdullahil Kafi
ICICT 2007: Proceedings of International Conference on Information and Communication Technology, 171-173, 2007, Peer-reviwed, Channel-spacing tunable and multi-wavelength switchable EDFL based on a single-segmented PMF Lyot-Sagnac filter and phase modulator is presented. The tuning and switching are performed by means of a polarizer and PC, respectively
those are incorporated in the filter.
International conference proceedings, English

Pulse-width tunable waveform conversion by combination of fiber- and SOA-based switches
Motoharu Matsuura; Kazuhiro Chida; Naoto Kishi; Tetsuya Miki
2007 ASIA-PACIFIC CONFERENCE ON COMMUNICATIONS, IEEE, 459-460, 2007, Peer-reviwed, A novel pulse-width (unable waveform conversion, which converts a NRZ signal to RZ signal with an arbitrary pulse-width is proposed and demonstrated by combination of fiber- and semiconductor-based switches.
International conference proceedings, English

Hybrid static-dynamic wavelength/waveband allocation scheme for novel broadcast and select star-ring optical regional network
Yueping Cai; Motoharu Matsuura; Naoto Kishi; Tetsuya Miki
2007 ASIA-PACIFIC CONFERENCE ON COMMUNICATIONS, IEEE, 513-516, 2007, Peer-reviwed, We have proposed a novel star-ring optical regional network architecture with dynamic wavelength/waveband broadcast and select based on bandwidth reservation. In this network, the large number of wavelength resources generated by a single multi-carrier light source can be shared and utilized in a flexible and simple way. In this paper, a hybrid static-dynamic wavelength/waveband allocation scheme combined with dynamic traffic banding has been proposed to reduce the network cost and complexity. To achieve this goal, we define one hybrid static-dynamic wavelength/waveband partition scheme, and develop two wavelength/waveband allocation algorithms based on it. One is Maximum Waveband First (MWF) allocation and the other is Waveband Round Robin (WRR) allocation. Both physical implementation analysis and computer simulation have been carried out to verify our ideas. According to the results, our proposal can effectively reduce the number of used optical switching ports and simplify the edge node architecture.
International conference proceedings, English

All-optical regenerative multicasting from 1.55- to 1.3-μm wavelength window using dual-stage cascaded SOA-based wavelength converter
Motoharu Matsuura; Naoto Kishi; Tetsuya Miki
IEEE Photonics Technology Letters, 18, 24, 2659-2661, 15 Dec. 2006, Peer-reviwed, We propose and demonstrate, for the first time, all- optical multicasting from 1.55- to 1.3-μm wavelength window using the dual-stage cascaded semiconductor-optical - amplifier-based wavelength converter. Using our proposed technique, we also demonstrate amplitude regeneration of the converted signals at each multicasting output. © 2006 IEEE.
Scientific journal, English

Advanced signal processing and networking technologies for all-optical networks
N. Kishi; M. Matsuura; Y. Kishikawa; M. Taguchi; R. Murahata; T. Miki
Proceedings of AICT2006, 1A-2, Aug. 2006, Peer-reviwed
International conference proceedings, English

Photonic Dynamic Path Networks Based on Optical Burst Switching
T. Miki; N. Kishi; M. Matsuura; H. Oku
Proceedings of OECC 2006, IEICE PN/OECC 2006 Joint Workshop, WC1-C, Jul. 2006, Peer-reviwed
International conference proceedings, English

S,C,L-band tunable pulse train generation by using a single SOA-based wavelength converter
Masayoshi Taguchi; Motoharu Matsuura; Naoto Kishi; Tetsuya Miki
5C3-4, Jul. 2006, Peer-reviwed
International conference proceedings, English

Proposal of novel patterning effect controlling method by adusting power and wavelength of assist light for all-optical delayed-interferometric switch using SOA
Yuki Kishikawa; Motoharu Matsuura; Naoto Kishi
5C3-5, Jul. 2006, Peer-reviwed
International conference proceedings, English

Field experiment on photonic dynamic path networks with optical burst switching
Tetsuya Miki; Ryohei Murahata; Motoharu Matsuura; Naoto Kishi
5E4-2, Jul. 2006, Peer-reviwed
International conference proceedings, English

Photonic Burst Switching Network System and its Experiment
Tetsuya Miki; Motoharu Matsuura; Naoto Kishi
Proceedings of the International Workshop on Modern Science and Technology in 2006, 394-397, May 2006, Peer-reviwed
International conference proceedings, English

All-optical wavelength conversion with large wavelength hopping by utilizing multistage cascaded SOA-based wavelength converters
Motoharu Matsuura; Naoto Kishi; Tetsuya Miki
IEEE Photonics Technology Letters, 18, 8, 926-928, 15 Apr. 2006, Peer-reviwed, A novel broadband wavelength converter by multistage cascaded semiconductor optical amplifier (SOA)-based wavelength converters is proposed. We have demonstrated, for the first time, broadband wavelength conversion in the wavelength range of 1320-1610 nm by using three-stage cascaded SOA-based wavelength converters with each different gain band. © 2006 IEEE.
Scientific journal, English

Influence of patterning effect on the all-optical delayed-interferometric switch using semiconductor optical amplifier
Yuki Kishikawa; Motoharu Matsuura; Naoto Kishi
Last-Minute 6, Jan. 2006, Peer-reviwed
International conference proceedings, English

Experimental demonstration of an optical burst network with priority control and bandwidth range expansion
Ryohei Murahata; Kazune Takaoka; Toshihiko Yoshino; Ayako Iwaki; Hiroshi Fujita; Motoharu Matsuura; Naoto Kishi; Tetsuya Miki
Last-Minute 7, Jan. 2006, Peer-reviwed
International conference proceedings, English

Ultra-wideband wavelength conversion over 300 nm by cascaded SOA-based wavelength converters
Motoharu Matsuura; Naoto Kishi; Tetsuya Miki
2006 OPTICAL FIBER COMMUNICATION CONFERENCE/NATIONAL FIBER OPTIC ENGINEERS CONFERENCE, VOLS 1-6, OPTICAL SOC AMERICA, 2720-2722, 2006, Peer-reviwed, We report on, for the first time, over 300 nm all-optical wavelength conversion utilizing multi-stage cascaded SOA-based wavelength converters by means of nonlinear polarization rotation. (C) 2006 Optical Society of America.
International conference proceedings, English

All-optical regenerative multicasting for wdm downstream by dual-stage cascaded SOA-based wavelength converter
Motoharu Matsuura; Naoto Kishi; Tetsuya Miki
2006 European Conference on Optical Communications Proceedings, ECOC 2006, Th3.4.4, 2006, We have successfully demonstrated an all-optical multicasting from 1.55-μm to 1.3-μm wavelength window by using dual-stage cascaded SOA-based wavelength converter. We also present regeneration effect of the dual-stage wavelength converter at inverted operation.
International conference proceedings, English

Performances of a widely pulsewidth-tunable multiwavelength pulse generator by a single SOA-based delayed interferometric switch
M Matsuura; N Kishi; T Miki
OPTICS EXPRESS, OPTICAL SOC AMER, 13, 25, 10010-10021, Dec. 2005, Peer-reviwed, Performances of a multiwavelength optical pulse generator by utilizing a single semiconductor optical amplifier (SOA)-based delayed interferometric switch are investigated. The generator enables us to generate multiwavelength clock pulse trains, which are synchronized with an optical clock. Moreover, the output waveform can be easily controlled by adjusting the time delay and phase offset of the interferometric switch. The obtained pulsewidth controllability is also useful to optimize the waveform according to transmission lines with different cumulative dispersions. We have verified that the pulsewidth tuning enables us to optimize transmission characteristics with various cumulative dispersion values, and have successfully obtained the improved transmission performances of the waveform-converted signals in comparison with conventional signals.
Scientific journal, English

The evaluation of asymmetric y-junction waveguide parameter for power branching control by using finite element beam propagation method
Ruchaneeya Leepila; Suthichai Noppanakeepong; Naoto Kishi; Tetsuya Miki; Kunihiko Asama
No.563, Dec. 2005, Peer-reviwed
International conference proceedings, English

Proposal for broadband wavelength conversion by utilizing multi-stage cascaded SOA-based wavelength converters
Motoharu Matsuura; Naoto Kishi; Tetsuya Miki
Proc. 10^ OptoElectronics Communication Conference (OECC'2005), Seoul, Korea, Jul., 7P-072, Jul. 2005, Peer-reviwed
International conference proceedings, English

Analysis of Y-junction optical waveguide with reflecting surface by using the finite element beam propagation method
Ruchaneeya Leepila; Suthichai Noppanakeepong; Naoto Kishi; Tetsuya Miki
TE2-5, Jul. 2005, Peer-reviwed
International conference proceedings, English

Performance improvement of optical RZ-receiver by utilizing an all-optical waveform converter
M Matsuura; N Kishi; T Miki
OPTICS EXPRESS, OPTICAL SOC AMER, 13, 13, 5074-5079, Jun. 2005, Peer-reviwed, A practical receiver scheme with all-optical waveform conversion is proposed and demonstrated. To mitigate influence of the timing jitter of the received signal, the proposed receiver employs a semiconductor optical amplifier ( SOA)-based waveform converter, which can generate signal pulses with a rectangular-like profile. We have evaluated the receiver performances of the conventional and proposed schemes. The receiver sensitivity improvement of 0.7 dB and the phase-margin enlargement of 60 % were simultaneously achieved in comparison with the conventional receiver scheme. (C) 2005 Optical Society of America
Scientific journal, English

Novel priority-based dynamic bandwidth allocation with reservation for QoS supporting in TWT photonic burst Network
Yueping Cai; Zhongfu Wu; Naoto Kishi; Tetsuya Miki
SC-19, May 2005, Peer-reviwed
International conference proceedings, English

Widely pulsewidth-tunable multiwavelength synchronized pulse generation utilizing a single SOA-based delayed interferometric switch
M Matsuura; N Kishi; T Miki
IEEE PHOTONICS TECHNOLOGY LETTERS, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 17, 4, 902-904, Apr. 2005, Peer-reviwed, We demonstrate a multiwavelength synchronized pulse generation, which utilizes a single semiconductor-optical-amplifier-based delayed interferometric switch. Simultaneous 16-channel pulse trains with wide pulsewidth tunability, up to the unity duty-ratio, have been successfully obtained at 10 Gb/s. The transmitter has a compact and functional configuration in comparison with supercontinuum light source.
Scientific journal, English

Multiwavelength erbium-doped fiber Fabry-Perot laser and its uniform spectral lines power operation
F Ahmed; N Kishi; T Miki
IEEE PHOTONICS TECHNOLOGY LETTERS, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 17, 4, 753-755, Apr. 2005, Peer-reviwed, Multiwavelength erbium-doped fiber laser by means of phase modulation in a linear cavity configuration is presented. Stable multiwavelength lasing is achieved by applying any one of the waveforms of sine, square, sawtoothed, and triangular at a suitable frequency between 500 Hz to a few tens of kilohertz to the phase modulator. The output spectral lines power equalization is performed by adjusting the frequency to drive the all-fiber phase modulator and the polarization controller or dc offset voltage of a LiNbO3 amplitude modulator, which is incorporated in a polarization-maintaining fiber Lyot-Sagnac filter.
Scientific journal, English

Widely pulse-width tunable multiwavelength synchronized pulse generation using SOA-based wavelength and waveform converter
Motoharu Matsuura; Naoto Kishi; Tetsuya Miki
IEEE Photonics Technology Letters, 17, 4, 902-904, Apr. 2005, Peer-reviwed
Scientific journal, English

Multi-wavelength lasing and uniform spectral lines power operation of an erbium-doped fiber fabry-perot laser
F Ahmed; N Kishi; T Miki
2005 PACIFIC RIM CONFERENCE ON LASERS AND ELECTRO-OPTICS, IEEE, 293-294, 2005, Peer-reviwed, Multi-wavelength lasing in an EDF laser by means of phase modulation and its spectral lines power equalization using polarization controller, which is incorporated in a PMF Lyot-Sagnac filter are proposed and experimentally demonstrated.
International conference proceedings, English

Widely pulsewidth-tunable multiwavelength optical pulse generator with a single SOA-based delayed interferometric switch
Motoharu Matsuura; Naoto Kishi; Tetsuya Miki
IET Conference Publications, Institution of Engineering and Technology, 2005, 502, 487-488, 2005, Peer-reviwed, We have demonstrated a pulsewidth-tunable multiwavelength pulse generation by a SOA-based switch. By adjusting the pulsewidth, the transmission performances of the generated signals can be improved in comparison with the conventional RZ and NRZ signals.
International conference proceedings, English

All-optical wavelength conversion with large wavelength hopping by cascaded SOA-based wavelength converters
Motoharu Matsuura; Naoto Kishi; Tetsuya Miki
IET Conference Publications, Institution of Engineering and Technology, 2005, 502, Th4.3.5, 2005, Peer-reviwed, We have demonstrated, for the first time, broadband wavelength conversion in the wavelength range of 1320-1610 nm by using cascaded SOA-based wavelength converters with each different gain bands.
International conference proceedings, English

Performance improvement of optical RZ-receiver by utilizing an all-optical waveform converter
Motoharu Matsuura; Naoto Kishi; Tetsuya Miki
TuZ3, Nov. 2004, Peer-reviwed
International conference proceedings, English

Wavelength and Pulse-Width Tunable All-Optical Signal Converter With a Semiconductor-Based Int erferometric Switch
Motoharu Matsuura; Naoto Kishi; Tetsuya Miki
22A-03, Sep. 2004, Peer-reviwed
International conference proceedings, English

Architecture and technologies for burst photonic networks
Tetsuya Miki; Naoto Kishi
33P-06, Sep. 2004, Peer-reviwed
International conference proceedings, English

Performance improvement of optical RZ-receiver by utilizing semiconductor-based waveform converter
M Matsuura; N Kishi; T Miki
2004 IEEE LEOS ANNUAL MEETING CONFERENCE PROCEEDINGS, VOLS 1 AND 2, IEEE, 392-393, 2004, Peer-reviwed
International conference proceedings, English

Priority control for photonic burst networks
Y Sugimoto; S Sugawara; N Kishi; T Miki
2004 JOINT CONFERENCE OF THE 10TH ASIA-PACIFIC CONFERENCE ON COMMUNICATIONS AND THE 5TH INTERNATIONAL SYMPOSIUM ON MULTI-DIMENSIONAL MOBILE COMMUNICATIONS, VOLS 1 AND 2, PROCEEDINGS, IEEE, 386-390, 2004, Peer-reviwed, Concerning the composition method of photonic networks with combination of Wavelength Division Multiplex (WDM) and Optical Time Division Multiplex (OTDM), we studied on the dynamic bandwidth assignment algorithm for Photonic Burst Networks.
In this paper the dynamic bandwidth assignment algorithm, which has the two modes, Real-time Mode and Reservation Mode, is proposed. In this algorithm, the prioritization scheme for aggregating packets into optical burst at the edge node in regional networks is investigated. And its network performance through computer simulation is evaluated.
International conference proceedings, English

Novel radio on fiber access eliminating electric power supply at base station
Tetsuya Miki; Katsuyasu Kawano; Nobuo Nakajima; Naoto Kishi; Masaru Miyamoto; Tetsu Aoki
16D3-4, Oct. 2003, Peer-reviwed
International conference proceedings, English

A novel scheme of multi-protocol subcarrier/lambda label switching
Yuanyue Guo; Tetsuya Miki; Dongjin Wang; Naoto Kishi
No.34, Sep. 2003, Peer-reviwed
International conference proceedings, English

Continuum spectrum generation utilizing adiabatic compression in Raman amplifier for multi-wavelength pulse source
M Matsuura; N Kishi
OPTICS EXPRESS, OPTICAL SOC AMER, 11, 16, 1856-1861, Aug. 2003, Peer-reviwed, We have demonstrated a continuum spectrum generation utilizing adiabatic compression in Raman amplifier. Continuum medium consists of only dispersion-shifted fiber as a counter-pumped Raman gain medium. The power uniformity of the continuum spectrum can be improved by adjusting wavelength and power of the Raman pump source. A 16-nm-wide uniform continuum spectrum with the power fluctuation less than 3 dB is generated from an 18.0 ps pulse-width seed pulse produced by an electroabsorption modulator. (C) 2003 Optical Society of America.
Scientific journal, English

All-fiber ultra-fast switching using stimulated Raman scattering
F Ahmed; N Kishi
OPTICAL REVIEW, OPTICAL SOC JAPAN, 10, 3, 146-149, May 2003, Peer-reviwed, We propose a method for all-fiber ultra-fast switching using stimulated Raman scattering. It is based on the transference of energy from the signal as pump to the control signal as first Stokes by stimulated Raman scattering. In the absence of a control signal, the transference of energy from the pump signal to the generated first Stokes is negligible, which results in high output power at the pump signal wavelength. To minimize the walk-off problem between two wavelengths, we chose pump signal and control signal to be equally spaced on opposite sides of the zero dispersion wavelength of the fiber. Based on this assumption, the all-fiber ultra-fast optical switch with low power consumption and high output extinction ratio can be realized.
Scientific journal, English

A nation-wide photonic network architecture with dynamic bandwidth allocation for packet-based next generation networks
LR Nunes; D Santoso; S Sugawara; N Kishi; T Miki
IEICE TRANSACTIONS ON COMMUNICATIONS, IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, E86B, 3, 1031-1039, Mar. 2003, Peer-reviwed, A simple nation-wide core network architecture based on the optimized combination of WDM and OTDM technologies in a two-tier structure network is proposed. The dynamic timeslot allocation in a fixed length frame structure associated with the wavelength routing scheme creates a virtual path with variable bandwidth for edge-to-edge transport of any type of packet protocol without O-E-O conversion. The simulation results show that dynamic timeslot assignment with bandwidth reservation is the best alternative for the network bandwidth utilization efficiency. The influence of the delay caused by the physical size of the network during the request-acknowledgement process is also discussed.
Scientific journal, English

All-optical wavelength and pulse-width conversions with a Sagnac interferometer semiconductor-based switch
M Matsuura; N Kishi
OPTICS LETTERS, OPTICAL SOC AMER, 28, 2, 132-134, Jan. 2003, Peer-reviwed, A Sagnac interferometer switch with a semiconductor optical amplifier is proposed for all-optical wavelength and pulse-width conversions. The configuration of this switch is simple, and the switching speed is not limited by the semiconductor carrier's recovery time. The pulse width of the input data, 1.5 ps, is converted to 2.4-18.1 ps. A wavelength conversion of input data at 1539 nm to a tunable-wavelength bandwidth of 15 nm (1550-1565 nm) is also demonstrated. (C) 2003 Optical Society of America.
Scientific journal, English

All-fiber wavelength conversion of ultra-fast signal with enhanced extinction ratio using stimulated Raman scattering
F Ahmed; N Kishi
OPTICAL REVIEW, OPTICAL SOC JAPAN, 10, 1, 43-46, Jan. 2003, Peer-reviwed, We propose a simple method for all-fiber wavelength conversion of ultra-fast signal by means of stimulated Raman scattering. The idea is based on the transference of energy from the signal as pump to a desired signal as first Stokes by stimulated Raman scattering. To minimize the walk-off between two wavelengths, we chose the input signal and the desired output signal wavelengths, equally spaced on opposite sides of the zero dispersion wavelength of the fiber. Based on this assumption, we numerically analyzed the all-fiber wavelength converter for ultra-fast signal with high output power and significantly enhanced output extinction ratio.
Scientific journal, English

Virtual path architecture for Photonic Burst Networks
T Ogasawara; S Sugawara; N Kishi; T Miki
APCC 2003: 9TH ASIA-PACIFIC CONFERENCE ON COMMUNICATION, VOLS 1-3, PROCEEDINGS, IEEE, 612-614, 2003, Peer-reviwed, To realize ultra broadband networks using WDM techniques, we proposed Photonic Burst Networks which have two tiers of the optical-TDM regional network and the WDM long haul backbone networks. In this paper, we illustrate the network architecture, share the wavelength in the network. We present the virtual path architecture for this type of photonic burst network.
International conference proceedings, English

All-optical wavelength and pulsewidth conversions with a Sagnac interferometer semicondoctor based switch
Motoharu Matsuura; Naoto Kishi
04.3.1, Sep. 2002, Peer-reviwed
International conference proceedings, English

Full All-Optical Add Circuit for Asynchronous Photonic Packet Switch
Luis Romeu Nunes; Yanjyun Sun; Naoto Kishi; Tetsuya Miki
Proceedings of OECC2002, 11A3-5, Jul. 2002, Peer-reviwed
International conference proceedings, English

Highly stable nonlinear optical polarization switching by using a nonreciprocal all-optical circuit
Islam Ehsan Ul; Naoto Kishi
12A2-4, Jul. 2002, Peer-reviwed
International conference proceedings, English

All-Optical Self-Routing Circuit for Photonic Packets
Luis Romeu Nunes; Naoto Kishi; Tetsuya Miki
IEICE Transaction on Communications, E84-B, 11, 229-232, Nov. 2001, Peer-reviwed
Scientific journal, English

Numerical modeling and experimental confirmation of an efficient phosphosilicate-fiber Raman laser
F Ahmed; M Prabhu; A Taniguchi; NS Kim; K Ueda; N Kishi
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, INST PURE APPLIED PHYSICS, 40, 11, 6411-6414, Nov. 2001, Peer-reviwed, A model for a fiber Raman laser has been numerically solved including all the interactions between forward and backward travelling waves. The predicted numerical results are experimentally confirmed using a fiber Raman laser with P2O5-doped fiber. The maximum output power of 3.1 W at 1483.5 nm with a slope efficiency of 46% is experimentally obtained using a 300 in P2O5-doped fiber. Numerical results suggest that an output power of as much as 4 W with a slope efficiency of 57% can be achieved if the Raman cavity is optimized for the same input pump power.
Scientific journal, English

All-fiber optical signal inversion using stimulated Raman scattering
F Ahmed; LR Nunes; N Kishi
OPTICAL REVIEW, OPTICAL SOC JAPAN, 8, 5, 348-350, Sep. 2001, Peer-reviwed, We propose a method for all-optical signal inversion by means of stimulated Raman scattering (SRS). The idea is based on the transference of energy from the logic state "1" to the second stokes and making the logic state "0" into logic state "1" by receiving energy from the pump through SRS. According to the numerical simulation, a continuous wave pump source of 1.0 W at 1453 nm and a few hundred meters of highly nonlinear fiber are required to invert an input signal at 1555 nm. The optical signal is inverted with high on-off contrast ratio.
Scientific journal, English

A Novel Photonic NetworkArchitecture with Dynamic Bandwidth Assignment for Packet-based Next Generation Interne
L. R. Nunes; D. Santoso; S. Sugawara; N. Kishi; T. Miki
188-190, Jul. 2001
International conference proceedings, English

Frequency control characteristics of a single-frequency fiber laser with an external light injection
M Matsuura; N Kishi
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 7, 1, 55-58, Jan. 2001, Characteristics of a single-frequency erbium-doped fiber laser (EDFL) controlled by an external light source is investigated. The frequency control is achieved by cooperatively induced spatial hole-burning (SHR) formed by the interference between the lasing light and the external light. We evaluate the frequency stability of several cavity designs of the fiber laser and the frequency control characteristics in detail, Tunable operation as wide as 30-nm wavelength range with a good frequency stability is also demonstrated.
Scientific journal, English

All-fiber optical signal inversion using stimulated Raman scattering
Feroz Ahmed; Luis Romeu Nunes; Naoto Kishi
Optical Review, Optical Society of Japan, 8, 5, 348-350, 2001, Peer-reviwed, We propose a method for all-optical signal inversion by means of stimulated Raman scattering (SRS). The idea is based on the transference of energy from the logic state "1" to the second stokes and making the logic state "0" into logic state "1" by receiving energy from the pump through SRS. According to the numerical simulation, a continuous wave pump source of 1.0 W at 1453 nm and a few hundred meters of highly nonlinear fiber are required to invert an input signal at 1555 nm. The optical signal is inverted with high on-off contrast ratio.
Scientific journal, English

Modified split-step Fourier method for simulating wideband WDM transmission systems
Teeratep Sosakul; Naoto Kishi; Tetsuya Miki
1026-1029, Sep. 2000, Peer-reviwed
International conference proceedings, English

A Novel photonic network architechture without packet contention control for the next generation Internet
D.Santoso; S.Sugawara; N.Kishi; T.Miki
PD1-6, Jul. 2000, Peer-reviwed
International conference proceedings, English

Improvement of a fiber-optic transceiver for OTDR by using an external optical amplifier
N Kishi; T Sano
IEICE TRANSACTIONS ON ELECTRONICS, IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, E83C, 3, 418-422, Mar. 2000, Peer-reviwed, An improvement of the fiber-optic transceiver having both transmitter and receiver functions of optical time-domain reflectometers is examined. The improvement is achieved by introducing an external optical amplifier without changing the previously reported configuration. The characteristics of the transmitted Q-switched pulse and the receiver gain is studied theoretically and experimentally to estimate the performance improvement. It is found that the introduction of the external optical amplifier is a simple and effective way to the performance improvement.
Scientific journal, English

Frequency control characteristics of a single-frequency fiber laser with an external light injection
Motoharu Matsuura; Naoto Kishi
280-281, Oct. 1999, Peer-reviwed
International conference proceedings, English

A feasibility study of optical A-D conversion
D.Damdinbayar; N.Kishi; T.Miki
Proceeding of 1999 Asia Pacific Symposium on Information and Telecommunication Technologies(APSITT'99), 30-31, Aug. 1999, Peer-reviwed
International conference proceedings, English

Frequency control of a single-frequency fiber laser by cooperatively induced spatial-hole burning
N Kishi; T Yazaki
IEEE PHOTONICS TECHNOLOGY LETTERS, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 11, 2, 182-184, Feb. 1999, Peer-reviwed, A simple frequency control method of a single-frequency fiber laser is proposed and demonstrated. The mechanism of the frequency control arises from cooperatively induced spatial-hole burning (SHB) in a saturable absorber in the laser cavity, The SHB is formed by an external frequency-stabilized light source and the lasing light. Consequently, the lasing frequency can be tuned to the external light frequency. Moreover, narrow-linewidth operation is possible even when an external-source with a broad-linewidth is employed.
Scientific journal, English

Frequency control of a single-frequency fibre laser by cooperatively induced spatial hole-burning
Naoto Kishi; Tomonori Yazaki
PD2-5, Jul. 1998, Peer-reviwed
International conference proceedings, English

Optical broadband phase devices using axially nonsymmetrical W-type optical fibers
N Kishi; E Yamashita
JOURNAL OF LIGHTWAVE TECHNOLOGY, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 16, 2, 301-306, Feb. 1998, Peer-reviwed, This paper describes a numerical analysis of axially nonsymmetrical W-type optical fibers as optical-fiber-type broadband phase devices, Using these devices, phase difference between two orthogonal linear polarizations can be kept constant in a broad wavelength range, The propagation characteristics along a circular core with an elliptical cladding structure and an elliptical core with a circular cladding structure are numerically analyzed by the boundary-integral method, Using the numerical results, the performances of various broadband phase devices are theoretically compared.
Scientific journal, English

Fiber-optic transceiver with an optical circulator for optical time-domain reflectometers
Naoto Kishi; Takahumi Sano; Eikichi Yamashita
IEEE Journal of Selected Topics in Quantum Electronics, 3, 4, 1045-1048, Jul. 1997, Peer-reviwed
Scientific journal, English

Fiber-optic transceiver for optical time-domain reflectometers using an active fiber ring
N Kishi; M Sakauchi; T Sano; E Yamashita
OPTICAL REVIEW, OPTICAL SOC JAPAN, 4, 1A, 99-103, Jan. 1997, Peer-reviwed, A fiber-optic transceiver which is particularly suitable for long range optical time-domain reflectometers is proposed. An active fiber ring employed in the proposed configuration has both transmitter and receiver functions. The active fiber ring acts as a Q-switched pulse laser source in the transmitter whereas it acts as an optical preamplifler in the receiver. Experimental results on the reflection detection of several lengths of optical fibers have confirmed the operation principle of the proposed scheme.
Scientific journal, English

Auto-correlation method for weak optical short pulses using a nonlinear amplifying loop mirror
N Kishi; K Kawachi; E Yamashita
IOOC-ECOC 97 - 11TH INTERNATIONAL CONFERENCE ON INTEGRATED OPTICS AND OPTICAL FIBRE COMMUNICATIONS / 23RD EUROPEAN CONFERENCE ON OPTICAL COMMUNICATIONS, VOL 3, INST ELECTRICAL ENGINEERS INSPEC INC, 448, 215-218, 1997, Peer-reviwed, A new auto-correlation. method for measurement of weak optical short pulses by using a nonlinear amplifying loop mirror is proposed and demonstrated. Measurement sensitivity of 0.05(mW)(2) (peak power x average power) for picosecond pulses is achieved.
International conference proceedings, English

Modal analysis of optical fibers with symmetrically distributed nonuniform cores
N Kishi; K Tayama; E Yamashita
JOURNAL OF LIGHTWAVE TECHNOLOGY, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 14, 8, 1794-1800, Aug. 1996, Peer-reviwed, This paper describes the modal analysis of optical fibers with symmetrically distributed multiple cores. Each core has an identical, axially symmetrical, and nonuniform refractive index profile. Group theoretical approach is applied to treat the symmetry of the waveguide structure. The point-matching method combined with the staircase-approximation method is used to take into account complex boundary conditions and complex refractive index distributions. The numerical computation based on this approach has been found to be very effective.
Scientific journal, English

Fibre-optic transceiver using an active fibre ring
Naoto Kishi; Masahiro Sakauchi; Eikichi Yamashita
Technical Digest of 11th International Conference on Optical Fiber Sensors (OFS-11), Th3-41, May 1996, Peer-reviwed
International conference proceedings, English

Optical broadband phase devices using axially non-symmetrical W-type fibres
Naoto Kishi; Eikichi Yamashita
IEICE technical report. Microwaves, The Institute of Electronics, Information and Communication Engineers, 96, 27, S02-3, Apr. 1996, Peer-reviwed, Numerical characterization of axially non-symmetrical W-type optical fibres is described for constructing optical fibre type broadband phase devices. The phase difference between two orthogonal linear polarizations can be kept constant in a broad wavelength range by using these devices. A circular core with an elliptical cladding, and an elliptical core with a circular cladding structures are numerically characterized with a boundary-integral method. The performances of these devices are compared with those of other devices.
International conference proceedings, English

Modal analysis of multiple-core optical fibers with distributed nonuniform cores
Naoto Kishi; Ken'ichi Tayama; Eikichi Yamashita
S07-4, Oct. 1995, Peer-reviwed
International conference proceedings, English

MICROWAVE GENERATION USING LASER HETERODYNE TECHNIQUE WITH INDEPENDENT CONTROLLABILITY IN FREQUENCY AND PHASE
N KISHI; M AGA; E YAMASHITA
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 43, 9, 2284-2287, Sep. 1995, Peer-reviwed, This paper describes the theoretical and experimental Investigation of a scheme for microwave generation using laser heterodyne. The frequency of the generated microwave is controlled by changing the frequency difference between two temperature-controlled semiconductor laser diodes. The phase difference between the two microwaves is controlled by changing the difference between the two states of polarization of two laser beams. An attractive feature of this scheme is its easy and independent controllability in frequency and phase.
Scientific journal, English

Microwave generation with variable frequency and phase using laser heterodyning technique
Naoto Kishi; Masahiro Aga; Eikichi Yamashita
EOP-081R-15, Oct. 1993, Peer-reviwed
International conference proceedings, English

ACTIVELY MODE-LOCKED AND PASSIVELY Q-SWITCHED OPERATION OF THULIUM-DOPED FIBER LASER USING MULTIQUANTUM WELL ASYMMETRIC FABRY-PEROT MODULATOR
N KISHI; JN CARTER; R MOTTAHEDEH; PR MORKEL; RG SMART; AJ SEEDS; JS ROBERTS; CC BUTTON; DN PAYNE; AC TROPPER; DC HANNA
ELECTRONICS LETTERS, IEE-INST ELEC ENG, 28, 2, 175-177, Jan. 1992, Peer-reviwed, An actively mode-locked and passively Q-switched thulium-doped fluorozirconate fibre laser using an AlGaAs/GaAs multiquantum well (MQW) asymmetric Fabry-Perot modulator (AFPM) is reported. This is the first demonstration of active mode locking of fibre lasers using MQW modulators. Mode locked pulse trains of 6 ns pulsewidth are obtained within a Q-switched envelope of 400 ns duration.
Scientific journal, English

REALIZATION OF BROAD-BAND PHASE DEVICES BY USING W-TYPE ECCENTRIC-CORE OPTICAL FIBERS
N KISHI; E YAMASHITA
JOURNAL OF LIGHTWAVE TECHNOLOGY, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 8, 8, 1207-1211, Aug. 1990, Peer-reviwed
Scientific journal, English

Realization of Broad-Band Phase Devices by Using W-Type Eccentric-Core Optical Fibers
Naoto Kishi; Eikichi Yamashita
Journal of Lightwave Technology, 8, 8, 1207-1211, 1990, Peer-reviwed, Axially nonsymmetrical W-type optical fibers are proposed as broad-band phase devices for optical-fiber systems to play the role of the Fresnel’s rhomb retarder in classical optical systems. Propagation characteristics of the W-type eccentric-core optical fibers are investigated theoretically by using the boundary-integral method. The results of the numerical analysis indicate that such broad-band phase devices can be realized by using the wavelength-dependent birefringence of axially nonsymmetrical W-type optical fibers. It has been theoretically found in the case of eccentric cores that the relative bandwidth of 18.2% with the phase retardation errors of 2% is realizable without the propagation of higher order mode waves. © 1990, IEEE.
Scientific journal, English

MODAL AND COUPLING-FIELD ANALYSIS OF OPTICAL FIBERS WITH LINEARLY DISTRIBUTED MULTIPLE CORES
N KISHI; E YAMASHITA; H KAWABATA
JOURNAL OF LIGHTWAVE TECHNOLOGY, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 7, 6, 902-907, Jun. 1989, Peer-reviwed
Scientific journal, English

VECTORIAL WAVE ANALYSIS OF UNIFORM-CORE OPTICAL FIBERS USING A NOVEL BOUNDARY INTEGRAL METHOD
N KISHI; T OKOSHI
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 37, 3, 526-533, Mar. 1989, Peer-reviwed
Scientific journal, English

A SIMPLE COUPLED-MODE ANALYSIS METHOD FOR MULTIPLE-CORE OPTICAL FIBER AND COUPLED DIELECTRIC WAVE-GUIDE STRUCTURES
N KISHI; E YAMASHITA
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 36, 12, 1861-1868, Dec. 1988, Peer-reviwed
Scientific journal, English

A simple coupled-mode analysis method for multiple-core optical fiber and coupled dielectric waveguide structures
Naoto Kishi; Eikichi Yamashita
OF-2-3, May 1988, Peer-reviwed
International conference proceedings, English

Analytical characterization method for composite circular planar circuits
Naoto Kishi; Eikichi Yamashita
Microwave and Optical Technology Letters, 1, 1, 16-18, 1988, Peer-reviwed, An analytical method for estimating the transmission characteristics of a composite circular planar circuit is presented. The impedance matrix of the circuit is calculated from the circular harmonic expansion of fields. The calculated values of the transmission parameters are compared with experimental results. Copyright © 1988 Wiley Periodicals, Inc., A Wiley Company
Scientific journal, English

PROPOSAL FOR A BOUNDARY-INTEGRAL METHOD WITHOUT USING GREEN-FUNCTION
N KISHI; T OKOSHI
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 35, 10, 887-892, Oct. 1987, Peer-reviwed
Scientific journal, English

MODAL AND COUPLING FIELD ANALYSIS OF OPTICAL FIBERS WITH CIRCULARLY DISTRIBUTED MULTIPLE CORES AND A CENTRAL CORE
N KISHI; E YAMASHITA; K ATSUKI
JOURNAL OF LIGHTWAVE TECHNOLOGY, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 4, 8, 991-996, Aug. 1986, Peer-reviwed
Scientific journal, English

Modal and Coupling Field Analysis of Optical Fibers with Circularly Distributed Multiple Cores and a Central Core
Naoto Kishi; Eikichi Yamashita; Kazuhiko Atsuki
Journal of Lightwave Technology, 4, 8, 991-996, 1986, Peer-reviwed, The methods of modal and coupling field analysis for optical fibers with circularly distributed cores and a central core are presented. The point-matching technique combined with group theory is used for the modal analysis. The coupling field characteristics are analyzed by the superposition of eigenmode fields thus obtained. © 1986 IEEE
Scientific journal, English

Modal analysis of optical fibers with circularly distributed cores and a central core
Eikichi Yamashita; Naoto Kishi; Kazuhiko Atsuki
27-30, May 1985, Peer-reviwed
International conference proceedings, English

複合媒質平面回路のポイントマッチング法による解析
來住直人; 山下栄吉; 厚木和彦; 小手川賢二
電子通信学会論文誌, 電子通信学会, J67-B, 9, 994-995, Sep. 1984, Peer-reviwed
Scientific journal, Japanese

光ファイバ通信
來住直人
電子情報通信学会東京支部, 2014, 電子情報通信学会東京支部学生会会報, 19, 13-18, Japanese, Invited, Introduction other

Optical fiber communication systems: an essential infrastructure for 21st century
Naoto Kishi
Lead, Sep. 2001, Information and Communication Technology Review (Computer Association of Nepal), 1, 2, 10-13, English, Invited, Introduction other

光ファイバを用いたパッシブデバイス
來住直人
Lead, Feb. 2000, オプトロニクス, 154-158, Japanese, Introduction other

光ファイバの非線形現象とその応用（講座「非線形分光法：原理と応用」
來住直人
Lead, Dec. 1998, 分光研究, 47, 6, 286-298, Japanese, Peer-reviwed, Introduction other

電子材料ハンドブック
木村忠正; 八百隆文; 奥村次徳; 豊田太郎; 編; 数に
Japanese, Joint work, 7.8節 光ファイバ材料, 朝倉書店, Nov. 2006

非線形分光法
霜田光一; 笠原俊二; 馬場正昭; 加藤肇; 高柳正夫; 岡本裕巳; 藤井正明; 築山光一; 小林俊介; 田原太平; 富永圭介; 藤村勇一; 和田昭英; 堂免一成; 廣瀬千秋; 寺嶋正秀; 來住直人
Japanese, Joint work, XII 光ファイバの非線形現象とその応用, 日本分光学会, May 1999

インラインマッハツェンダ干渉計を用いた温度依存性の小さい屈折率センサー
耿健; 來住直人
Oral presentation, English, 電子情報通信学会光ファイバ応用技術研究会, 電子情報通信学会光ファイバ応用技術研究会, 古河電工本社, Japan, 本研究では、インラインマッハツェンダ干渉計を用いた屈折率センサーを提案している。このセンサーはフォトニック結晶ファイバ及び放電とテーパリングにより作成された多段の微小紡錘形で構成される。感度を高めるために、フォトニック結晶光ファイバの中央にテーパ形多モード光ファイバを挿入している。このセンサーは1.33-1.334の範囲内で屈折率の感度が-2958.875nm/RIUとなり、25℃-65℃の範囲内で温度の感度が6.4pm/℃となる。このように、屈折率の高感度計測が、屈折率と温度のクロストークを効果的に抑制
した状態で実現できる。
11 Oct. 2024
10 Oct. 2024- 11 Oct. 2024

スポットサイズ変換器を用いたマルチモードファイバの伝搬特性検証
石川翔也; 來住直人
Poster presentation, Japanese, 電子情報通信学会光ファイバ応用技術研究会, 電子情報通信学会光ファイバ応用技術研究会, 古河電工本社, Japan, スポットサイズ変換器を用いたマルチモードファイバの伝搬特性検証マルチモードファイバの信号品質の改善を目的として、単一モードファイバとの融着接続により、ビットレート 10 Gb/s の信号を用いてマルチモードファイバの伝搬特性を検証した。結果として、全ての融着接続方法でエラーフリーを達成した。特に、融着時の放電位置には最適値が存在することがわかった。, Domestic conference
10 Oct. 2024
10 Oct. 2024- 11 Oct. 2024

Electromagnetic field properties of higher-order coupled-modes of symmetrical dual-core optical fibers
來住直人
Oral presentation, Japanese, 電子情報通信学会光ファイバ応用技術研究会, 電子情報通信学会光ファイバ応用技術研究会, 北海道札幌市 道民活動センター（かでる２・７）, https://ken.ieice.org/ken/paper/20240822mcEW/, Japan, Higher-order coupled-mode fields of symmetrical dual-core optical fibers are analyzed by using group-theory adapted point-matching method. Effects of propagation constants of LP11 mode group of single-core fibers over the frequency-dependent field characteristics of dual-core optical fibers are clarified. Expressions of the dual-core fields in terms of the fields of LP11 mode group are also investigated., Domestic conference
22 Aug. 2024
22 Aug. 2024- 23 Aug. 2024

A Simultaneous audio and temperature sensing system employing in-line Mach-Zehnder interferometer sensor
Jian Geng; Naoto Kishi
Oral presentation, English, 電子情報通信学会光ファイバ応用技術研究会, 電子情報通信学会, 姫路・西はりま地場産業センター(じばさんびる), Japan, 本研究では、ピーナッツ型構造を用いて偏波保持光ファイバの両端を単一モードファイバで挟んだ構成のインラインマッハツェンダ干渉計を用いた音響と温度を同時に計測するシステムを提案している。このシステムは 20 Hz から 20000 Hz までの周波数範囲の音響波を高感度で検出可能である。理論と実験の分析に基づき、高速サンプリングと二波長復調の方法を利用して、センサで検知された曲率と温度のデータを処理することにより、音響と温度の同時計測を実現した。さらに、温度変化が引き起こす音響センサの感度が低下する問題を解決した。, Domestic conference
19 Jan. 2024
18 Jan. 2024- 19 Jan. 2024

スペクトル拡散による波長変換と経路差を用いた光可変遅延線
柳瀬 歩陸; 岡本 萌力都; 來住直人
Japanese, 電子情報通信学会光ファイバ応用技術研究会, 電子情報通信学会, 機械振興会館, Japan, フォトニックネットワークにおいて用いられる光可変遅延線において, 光ファイバの四光波混合による波長変換器においては, ポンプ光のパワーを増すことで高効率を図れるが, 誘導ブリルアン散乱の影響によりポンプ光のパワーは制限を受ける. そのためスペクトル拡散を用いて光のスペクトルを広げ高効率な波長変換を実現した. 導波路型回折格子(AWG) を用いて特定の波長を切り出すことにより任意の量の遅延を与え, その特性を検証した., Domestic conference
12 Oct. 2023
12 Oct. 2023- 13 Oct. 2023

微細型3コアファイバにおける高次の結合モードの電磁界解析
見山倖大, 來住直人
Oral presentation, Japanese, 電子情報通信学会光ファイバ応用技術研究会, 電子情報通信学会, 機械振興会館, Japan, 正三角形の各頂点上に同一のコアを近接対称配置した微細型３コアファイバの高次の結合モードにおけるベクトルモード電磁界を, 群論適用点整合法を用いて解析した。微細型３コアファイバの各コアと、単一コアファイバのベクトルモード電磁界を比較することにより高次の結合モードの特性を検討した。, Domestic conference
12 Oct. 2023
12 Oct. 2023- 13 Oct. 2023

強結合対称配置6コアおよび6+1コア光ファイバのベクトルモード電磁界
來住直人
Oral presentation, Japanese, 電子情報通信学会光ファイバ応用技術研究会, 円周上に同一のコアを近接対称配置した6コア光ファイバと、その構造の中心に同一のコアを付加した6+1コア光ファイバ(7コア光ファイバ)のベクトルモード電磁界を、群論適用点整合法を用いて解析した。これらの二種類の光ファイバ構造の電磁界解析により、中心コアの有無によるベクトルモード電磁界の差異を明らかにすると共に、化学分野の分子軌道法における近似解法と類似の手法による解析の有効性の検証を行った。
11 May 2023
11 May 2023- 12 May 2023

全偏波合成開口レーダ 7成分解法を用いた地震被害区域の識別
住田桃子, 尚方, 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告, 電子情報通信学会, 宮古島市中央公民館(未来創造センター)およびZoomを用いたhybrid開催, 全偏波合成開口レーダを用いた地震被害規模判定法の開発への期待は大きい。しかしながら人工構造物の散乱特徴が複雑であるため、開発には困難が伴う。最新の解析法の7成分解法は、建物地域や植生地域における識別に有効で、より豊富な散乱情報を提供するため、建物を目的とした被害規模判定法で効果的な解析法である。本論文では、熊本地震で被災した熊本県益城町の ALOS2-PALSAR2データに基づき、7成分解法の7成分の成分変化を定量化し、被害規模判定法の提案と検証を行った。
02 Mar. 2023
02 Mar. 2023

合成開口レーダデータを用いた機械学習による建物の向き・角度の判別
岡庭康浩, 尚方, 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告, 電子情報通信学会, 電子航法研究所およびZoomを用いたhybrid開催, 偏波合成開口レーダによる建物の観測において, 災害後被害状況の把握,都市発展の分析,地表物マッピング等のために有効であり,注目を集めている研究テーマの一つである。しかし、人工物の形態が複雑であるため,高性能の識別法は確立されていない。本研究では人工物に対して優れた解析性能を持つポアンカレ球パラメータと四元数ニューラルネットワークを用いた機械学習による東京エリアの建物の角度の判別及び判別結果の定量的な精度評価によって提案法の性能を検証した。
20 Jan. 2023
20 Jan. 2023

円周上対称配置 n コアと中心コアで構成される光ファイバのベクトルモード電磁界解析の有効性検証
來住直人; 弓野健人
Oral presentation, Japanese, 電子情報通信学会技術研究報告, 電子情報通信学会, Zoomによる遠隔開催, 円周上に対称配置した n 個のコアと単一の中心コアで構成される結合形光ファイバ構造のベクトルモード電磁界解析に群論適用点整合法を適用し、その有効性の検証を行った。正規化平均二乗誤差を用いてコアとクラッドの境界における電磁界の境界条件の成立精度を解析し、既報の円周上対称配置結合形 n コア光ファイバと同様に、コア間距離が小さく、各コアの電磁界が単一コアファイバの場合と大きく異なる場合においても、ベクトルモード電磁界が精度良く解析できることが明らかになった。, Domestic conference
13 Oct. 2022

強結合円周上対称配置nコア光ファイバのベクトルモード電磁界解析
來住直人
Invited oral presentation, Japanese, 電子情報通信学会技術研究報告, Invited, 電子情報通信学会フォトニックネットワーク研究会, 機械振興会館(東京), https://www.ieice.org/ken/program/index.php?tgs_regid=83523f7d11a7ddd8bbfc47f92984c332bebf134badf9426ed55b757a1491e634&tgid=IEICE-PN, 単一のクラッド内に複数のコアを含む「マルチコア光ファイバ」に関しては、多数の大容量伝送の実証実験が報告・検討されているが、そのような光ファイバの光波伝搬特性、ことにベクトルモードの特性に関する検討は極めて少ない。本報告においては、複数個のコアを円周上に対称的に近接配置したマルチコア構造のベクトルモード電磁界解析手法として「群論適用点整合法」を取り上げ、多数の固有モードの系統的な分類と、正確なベクトルモード電磁界の解析が可能であることを示す。併せて、このような構造に対して有効な、化学分野における分子軌道計算と類似の手法を用いた近似解法についても提示する。, Domestic conference
25 Apr. 2022
25 Apr. 2022- 25 Apr. 2022

四光波混合による波長変換と経路差を用いた光可変遅延線におけるNRZ-DPSK信号の伝搬特性評価
岡本萌力都; 小林瑞貴; 來住直人
Poster presentation, Japanese, 電子情報通信学会技術研究報告, 電子情報通信学会, Zoomによる遠隔開催, フォトニックネットワークの実現に向けて、 光信号のタイミングを制御するために全光可変遅延線が求められている。本報告では、四光波混合による波長変換と経路長差を組み合わせた光可変遅延線におけるNRZ-DPSK 信号の信号遅延特性の検証を行った。結果として良好な信号遅延特性が得られ、この光可変遅延線はNRZ-DPSK 信号に適用可能であることが示された。, Domestic conference
14 Oct. 2021

円周上対称配置3コア光ファイバのベクトルモード電磁界解析
小林豪太; 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告, 電子情報通信学会, Zoomによる遠隔開催, 群論と点整合法を用いた解析法により微細型3 コアファイバのベクトルモード電磁界解析を行い、複数のコアを微細に配置した場合の電磁界への影響を検討し、シングルモードファイバとの比較を行った。, Domestic conference
19 Feb. 2021
19 Feb. 2021- 19 Feb. 2021

光ファイハ゛を用いたインコヒーレント光信号の検出方式
鄭宇原; 來住直人
Poster presentation, Japanese, 電子情報通信学会技術研究報告, 電子情報通信学会, Zoomによる遠隔開催, 本報告では、インコヒーレント光源を信号として、光ファイバで構築した光信号検出システムにより、自由空間に伝搬した光信号を検出する可視光通信システムを構成した。空間に発散した信号を集中し信号品質を測定することで空間経由光信号の特性を検証した。結果として、インコヒーレント光信号の検出ができ、扱い易く、高安全性、低消費電力の可視光通信システムの構築が可能であることが示された。, Domestic conference
19 Feb. 2021

波長変換に対応した光フーリエ変換を用いた歪補償可変遅延線
畑山進丸; 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告, 電子情報通信学会, Zoomによる遠隔開催, 相互位相変調を用いた光フーリエ変換及び四光波混合を用いた波長変換によって構成された光可変遅延線の特性検証を行った。先行研究では波長変換を行ったのち元の波長に戻す過程が省かれていたため、本研究では遅延線本来の構成において出力を確認し、検証を行うことを目的としている。, Domestic conference
19 Feb. 2021

Lバンド合成開口レーダーによる森林観測における土地斜度影響の校正
渡邊有祈; 尚方; 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告, 電子情報通信学会, Zoomを用いたon-line開催, 先行研究では。構造パラメータに基づいて、Lバンドデータによる針葉樹と広葉樹の分類法を提案した。この観測にあたって、大きな影響を持つ土地の傾斜の校正が重要である。しかし、先行研究の校正法は局所入射角が大きい土地に対する校正能力が不足という欠点がある。本研究は、観測の精度向上のため校正パラメータを改良した。, Domestic conference
29 Jan. 2021

偏波合成開口レーダによる分散特徴を用いた建造物方位角の推定
長峰怜央; 尚方; 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告, 電子情報通信学会, Zoomを用いたon-line開催, 合成開口レーダ(SAR)はマイクロ波の送受信によって情報を収集するセンサである。建造物方位角は市街地区域の微気候の分析等に使用されているため測定手法の開発が非常に注目を集めている。現在、主流の推定方法は散乱分解において行列回転プロセスの回転角を用いた方法である。しかし、方位角の大きい建造物群に対する方位角の推定が困難になる。そこで、本研究では回転角度の分散特徴を用いたより精度の高い方位角の推定方法を提案した。, Domestic conference
28 Jan. 2021

円周上対称配置nコア光ファイバのベクトルモード電磁界解析の有効性検証
來住直人; 小林豪太
Oral presentation, Japanese, 電子情報通信学会技術研究報告, 電子情報通信学会, Zoomを用いた遠隔開催, #円周上対称配置結合形nコア光ファイバのベクトルモード電磁界解析に対する、群論適用点整合法の有効性の検証を行った。正規化平均二乗誤差を用いてコアとクラッドの境界における電磁界の境界条件の精度を解析し、構造や周波数に対する依存を検証した。コア間距離が小さく、各コアの電磁界が単一コアファイバの場合と大きく異なる場合においても、少ない整合点数によりベクトルモード電磁界が精度良く解析できることが明らかになった。, Domestic conference
15 Jan. 2021
15 Jan. 2021- 15 Jan. 2021

微細型5コアファイバの伝搬特性の解析
弓野健人; 小林豪太; 来住直人
Poster presentation, Japanese, 電子情報通信学会技術研究報告, 電子情報通信学会, Zoomによる遠隔開催, 本報告では、マルチモード光ファイバにNRZ-DPSK信号を伝送し、伝送後の信号品質を評価した。マルチモード光ファイバとシングルモード光ファイバを接続する際に、オフセットラウンチを用いることで、NRZ-DPSK信号を伝送させたときのモード分散の影響を抑えることに成功した。, Domestic conference
08 Oct. 2020
08 Oct. 2020- 08 Oct. 2020

四光波混合による波長変換と経路調査を用いた光可変遅延線におけるNRZ-OOK信号の遅延特性評価
小川拓海; 小林瑞貴; 來住直人
Poster presentation, Japanese, 電子情報通信学会技術研究報告, 電子情報通信学会, Zoomによる遠隔開催, 本報告ではNRZ-OOK信号に対して四光波混合により波長変換を行い、変換量に応じて通過する光ファイバの長さを変えることで波長の変換量に応じて遅延時間を発生させる光可変遅延線を構成した。遅延線通過後の信号品質および遅延量を測定することで遅延線の特性を検証した。結果として、経路長ごとに所望の遅延量を得ることができ、NRZ-OOK変調をした信号に適応した光可変遅延線を構築可能であることが示された。, Domestic conference
08 Oct. 2020

マルチモード光ファイバを用いたNRZ-DPSK信号の伝搬特性検証
滝澤英; 浅野航也; 來住直人
Poster presentation, Japanese, 電子情報通信学会技術研究報告, 電子情報通信学会, Zoomによる遠隔開催, 本報告では、マルチモード光ファイバにNRZ-DPSK信号を伝送し、伝送後の信号品質を評価した。マルチモード光ファイバとシングルモード光ファイバを接続する際に、オフセットラウンチを用いることで、NRZ-DPSK信号を伝送させたときのモード分散の影響を抑えることに成功した。, Domestic conference
08 Oct. 2020

四元数ニューラルネットワークによる高層建造物区域と低層建造物区域の分類
藤原夏姫; 尚方. 來住直人
Poster presentation, Japanese, 電子情報通信学会技術研究報告, 電子情報通信学会, Zoomを用いたon-line開催, 合成開口レーダによる人口建造物の識別、特に高層建造物と低層建造物の識別は散乱メカニズムの多様性により困難であり、有効な手段が提案されていない。そこで、本研究室で提案された人工建造物への識別精度が高い、ポアンカレ球パラメータによる四元数ニューラルネットワークを用いた高層建造物と低層建造物の識別における検証を行った。, Domestic conference
22 Apr. 2020

四光波混合による波長変換と経路長差を用いた低歪み光可変遅延線
小林瑞貴; 來住直人
Poster presentation, Japanese, 電子情報通信学会技術研究報告, 電子情報通信学会, 海峡メッセ下関 (下関市), 全光信号処理を行う上で必要な光可変遅延線が求められている。本報告ではRZ-DPSK 信号に対して四光波混合により波長変換を行い、波長ごとに信号が通過する光ファイバ長を変えることにより遅延を生じさせる光可変遅延線を構成した。遅延線通過後の信号品質や遅延量を測定することで遅延線の性能を検証した。結果として、経路に応じて所望の遅延量が得られ、低歪み可変遅延線を構築可能であることが示された。, Domestic conference
22 Nov. 2019

微細型3コア光ファイバの伝搬特性
小林豪太; 來住直人
Poster presentation, Japanese, 電子情報通信学会技術研究報告, 電子情報通信学会, i-Siteなんば (大阪府立大学 なんばサテライト教室), 点整合法と群論を用いた解析法により微細型3コア光ファイバの伝搬特性の解析を行い、複数のコアを微細に配置した場合の伝搬特性への影響を検討し、コア半径と比屈折率の積が重要なパラメータとなることが判明した。, Domestic conference
16 May 2019
16 May 2019- 17 May 2019

ストークスベクトルに基づくLバンドPOLSARデータを用いた針葉樹林と広葉樹林の識別
斉藤大河; 尚方. 來住直人
Poster presentation, Japanese, 電子情報通信学会技術研究報告, 電子情報通信学会, かんぽの宿有馬 (神戸市), ストークスベクトルに基づくパラメータの一つが、森林の識別に非常に有用であることを示す。 ALOS2-PALSAR2 データを用いて、このパラメータが針葉樹林と広葉樹林を区別するのに優れた性能を持つことを示す。, Domestic conference
17 May 2019

パルス圧縮を適用したOOK信号に高非線形ファイバにおける相互位相変調を用いたOTDM-to-WDM変換
池畑徹; 横田嶺; 來住直人
Poster presentation, Japanese, 電子情報通信学会技術研究報告, 電子情報通信学会, 東北大学電気通信研究所, 全光信号処理によるOTDM-to-WDM変換実現のため,相互位相変調を利用した信号変換について検討し、相互位相変調に利用するクロック信号とデータ信号の両信号をパルス圧縮する構成により信号変換を行った。OOK信号について波長変換量2.29nmの時エラーフリーを達成した。, Domestic conference
11 Oct. 2018

高非線形ファイバを用いたパルス圧縮及びNRZ-to-RZ波形変換の一括信号処理動作
寺師一輝; 横田嶺; 來住直人
Poster presentation, Japanese, 電子情報通信学会技術研究報告, 電子情報通信学会, 東北大学電気通信研究所, WDMからOTDMへの多重化方式変換を行う際に必要となるNRZ波形からRZ波形への変換と多重度を高めて多くの情報を伝達できるパルス圧縮があるが、 2つの光信号処理を一つの高非線形ファイバで一括動作させた。先行研究ではOOK信号のみでエラーフリーを達成していたが、本報告ではDPSK信号に注目した。結果，DPSK信号を用いてパルス圧縮及び波形変換する一括処理動作でエラーフリーを達成した。, Domestic conference
11 Oct. 2018

波長多重信号における光フーリエ変換を用いた歪補償可変遅延線
横田嶺; 高久優斗; 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告, 電子情報通信学会, 沖縄県立博物館 講座室, 全光信号処理のためのタイミング制御素子である光可変遅延線を、相互位相変調と光ファイバの波長分散によって実現される光フーリエ変換と四光波混合による波長変換を用いることで、低歪みで遅延時間の可変が可能な歪補償可変遅延線が実現できる。本報告においてはこの光可変遅延線を波長多重信号に対して適用して一括して遅延時間を与えることを試み、波長多重信号において歪補償可変遅延線であることを明らかにした。, Domestic conference
15 Feb. 2018

NRZ-OOK信号に対する波形変換及びWDM-to-OTDM変換
張インイ; 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告, 電子情報通信学会, 高知県民文化センター, 光ファイバの四光波混合を利用した全光信号処理を用いたNRZ信号からRZ信号への波形変換及び波長分割多重(WDM)から光時分割多(OTDM)への変換を簡単な構成で可能とする，2*10Gb/s WDMから20Gb/s OTDM変換を一括動作する手法を提案した．多重方式変換後，多重分離による単チャネルに対する符号誤り率特性の評価により動作の検証を行った．, Domestic conference
12 Oct. 2017

高次の四光波混合を用いたNRZ-to-RZ変換及び波長マルチキャスト
松本浩希; 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告, 電子情報通信学会, 高知県民文化センター, 光ファイバの非線形光学効果のみを用いた、NRZ-to-RZ変換と波長マルチキャストを一括で実現する手法の検証を行った。先行研究よりクロック光の数を増やすことで、入力光の数に対し、NRZ-to-RZ変換及び波長マルチキャストされる光の数の比率をさらに高めた。伝送速度10Gbit/sのNRZ-OOK信号がRZ-OOK信号へ波形変換され、15種の異なる波長でエラーフリー動作を達成した。, Domestic conference
12 Oct. 2017

光ファイバの四光波混合を用いたDPSK光信号のWDM-to-OTDM変換
小林竜也; 來住直人
Poster presentation, Japanese, 電子情報通信学会技術研究報告, 電子情報通信学会, 島根大学, 近年の光ファイバ通信ネットワークにおける主な多重化方式としては，WDM（波長分割多重）とOTDM（光時分割多重）があり，ネットワークによってこれら二つのいずれかが採用されている。これらの異なる多重化方式間の信号変換を行うためには，光信号のまま信号処理を行う，より透過性に優れた全光信号処理を採用することが望ましい。本報告では、光ファイバにおける四光波混合を用いることで二波長の10 Gb/s の波長多重信号から単一波長の20Gb/s の光時分割多重信号への多重化方式変換を試みた．, Domestic conference
25 May 2017

劣化した信号に対するWDM to OTDM変換の特性検証
浅野航也; 來住直人
Poster presentation, Japanese, 電子情報通信学会技術研究報告, 電子情報通信学会, 島根大学, スーパコンティニュム光を用いた、波長分割多重信号から光時分割多重信号への多重方式変換の劣化した波長分割多重信号への適用を試みた。光ファイバ伝送により信号品質を劣化させたビットレート10Gbit/sの二波長RZ-OOK信号を入力とし、ビットレート20Gbit/sの一波長OTDM信号へと変換を行い、劣化した信号に対するWDM to OTDM変換の特性検証を行った。, Domestic conference
25 May 2017

相互位相変調による光フーリエ変換を用いた歪補償可変遅延線
横田嶺; 高久優斗; 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告, 電子情報通信学会, 長崎市, 全光信号処理のためのタイミング制御素子として光可変遅延線の実現が求められている．本研究では波長変換と分散性媒質を用いる手法において，波長分散に起因する歪を補償するための光フーリエ変換器へ相互位相変調を適用し検証実験を行った．相互位相変調を用いた光フーリエ変換器と四光波混合による波長変換器を用いることで非線形光学効果のみを用いた全光可変遅延線を構成することが可能となった．結果として，相互位相変調を用いた場合においても歪の少ない出力が得られ理論値と一致する遅延量となった．また，本構成が強度変調および位相変調信号に適用できることを明らかにした．, Domestic conference
11 Nov. 2016

Distortion compensating optical variable delay line using cross phase modulation assisted optical Fourier transformation
横田 嶺; 高久 優斗; 來住 直人
Japanese, 映像情報メディア学会技術報告 = ITE technical report, 映像情報メディア学会, http://id.ndl.go.jp/bib/027774372
Nov. 2016
Nov. 2016 Nov. 2016

結合形3コア光ファイバのモード間群遅延の波長特性の解析
來住直人; 田村紘輝; 中山敬介
Oral presentation, Japanese, 電子情報通信学会技術研究報告, 電子情報通信学会, 盛岡マリオス, 対称配置結合形3コア光ファイバの固有モード伝搬特性を群論を適用した点整合法を用いて解析し、モード間群遅延差の波長特性の解析を行った。コアとクラッドの比屈折率差とコア半径、コア間距離等のパラメータがモード間群遅延差特性に及ぼす影響について検し、
群遅延差の波長特性を決める要因のひとつがコア半径と比屈折率差の積であることや、長波長においてモード間群遅延差が零となる波長が存在しうるこどがわかった。, Domestic conference
13 Oct. 2016

ファラデー回転ミラーとマイケルソン干渉計を用いたDPSK受信機の検討
島崎興平; 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告, 電子情報通信学会, 沖縄大学, Domestic conference
18 Feb. 2016

進化した無線通信技術に柔軟かつ効率的に対応するためのアナログRoFと光給電を用いた光無線基地局ネットワーク
山尾泰; 來住直人; 大木英司; 松浦基晴
Oral presentation, Japanese, 電子情報通信学会技術研究報告, 福井大学, Domestic conference
05 Mar. 2015

国際会議報告: Optoelectronics and Communication Conference 2014/Australian Conference on Optical Fiber Technology (OECC/ACOFT 2014: 光エレクトロニクス・光通信国際会議/光ファイバ技術豪州会議 2014)
來住直人
Others, Japanese, 電子情報通信学会誌, Vol.98, No.2, p.165, 2015年2月, International conference
Feb. 2015

B-12-6 Enhancement of the delay in optical variable delay line by using optical Fourier transformation
Horigome Ryohei; Kishi Naoto
Japanese, Proceedings of the Society Conference of IEICE, The Institute of Electronics, Information and Communication Engineers
09 Sep. 2014
09 Sep. 2014- 09 Sep. 2014

Energy-efficient scheme for networks with optimal traffic splitting technique
Ruchaneeya Leepila; Naoto Kishi; Eiji Oki
Oral presentation, English, 2014年電子情報通信学会総合大会, 電子情報通信学会, 新潟大学, Domestic conference
21 Mar. 2014

All-optical 4×10 Gb/s ultra-short pulsewidth NRZ-to-RZ format conversion and wavelength multicasting using Raman amplifier multiwavelength pulse compressor
Quang Nhu; Quynh Nguyen; Nguyen-The Quang; Nguyen Tan Hung; Motoharu Matsuura; Naoto Kishi
Oral presentation, English, 2014年電子情報通信学会総合大会, 電子情報通信学会, 新潟大学, Domestic conference
20 Mar. 2014

Novel picosecond width-tuning NRZ-DPSK-to-RZ-DPSK conversion using a Raman amplif
Irneza Ismail; Quang Nguyen The; Motoharu Matsuura; Gazi Mohammad Sharif; Naoto Kishi
Oral presentation, English, 2014年電子情報通信学会総合大会, 電子情報通信学会, 新潟大学, Domestic conference
20 Mar. 2014

スーパーコンティニューム光を用いたDPSK信号のWDM-to-OTDM変換
鈴木亮太; グェン テ クワン; 來住直人
Oral presentation, Japanese, 2014年電子情報通信学会総合大会, 電子情報通信学会, 新潟大学, Domestic conference
19 Mar. 2014

半導体光増幅器の光波形変換において制御光にRZ-DPSKを用いた場合の特性検証
土居祐太; 來住直人
Oral presentation, Japanese, 2014年電子情報通信学会総合大会, 電子情報通信学会, 新潟大学, Domestic conference
18 Mar. 2014

無電源基地局光ファイバ無線通信システムにおける給電系の評価
アベーセーカラ ワリムニ; ハスィタ メンディス; 松浦基晴; 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告, 同志社大学, 京都市, Domestic conference
23 Jan. 2014

チャープを伴わない光フーリエ変換を用いた低歪み光可変遅延線
堀込亮平; 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告
24 Oct. 2013

半導体光増幅器の光波形変換において制御光にRZ-DPSKを用いた場合の特性検証
土居祐太; 松浦基晴; 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告
24 Oct. 2013

半導体光増幅器による多チャンネル光波長変換を用いた光制御フェーズドアレイアンテナの制御法
岩崎航; 松浦基晴; 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告
01 Mar. 2013

Pulsewidth tunable and polarization-insensitive NRZ-to-RZ conversion by using fiber nonlinearity based circuits
Gazi Mohammad Sharif; Quang Nguyen-The; Motoharu Matsuura; Naoto Kishi
Oral presentation, English, 電子情報通信学会技術研究報告
25 Oct. 2012

半導体光増幅器と光ファイバ中の自己位相変調を用いた光信号波形変換
井上翔太; 松浦基晴; 來住直人
Oral presentation, Japanese, 2012年電子情報通信学会そさいえてぃ大会, 電子情報通信学会, 富山大学, Domestic conference
12 Sep. 2012

半導体光増幅器を用いた多波長一括光信号波形変換
井上翔太; 松浦基晴; 來住直人
Oral presentation, English, 電子情報通信学会技術研究報告
May 2012

光フーリエ変換を用いた光可変遅延回路の構成法
渡邊朋之; 小野智彦; グェン テ クワン; 松浦基晴; 來住直人
Oral presentation, English, 電子情報通信学会技術研究報告
Mar. 2012

Performance of Optical Packet Switch based on Recursive Parametric Wavelength Conversions
キットスワン ナッタポン; グウェン タン フン; 松浦基晴; 來住直人; 大木英司
Oral presentation, English, 電子情報通信学会技術研究報告
Nov. 2011

多チャンネル光波長変換を用いたフェーズドアレイアンテナの制御
岩崎航; 松浦基晴; 來住直人
Oral presentation, English, 電子情報通信学会技術研究報告
Oct. 2011

信号のスペクトル変化を利用した簡易型自動波長分散補償システム
森村俊; 來住直人
Oral presentation, English, 電子情報通信学会技術研究報告
Aug. 2011

ヘテロダイン方式を用いた無電源光ファイバ無線通信システム
平尾元紀; 松浦基晴; 來住直人
Oral presentation, English, 電子情報通信学会技術研究報告
Mar. 2011

外部注入光を用いた単一周波数光ファイバレーザの発振周波数制御特性
雨宮浩司; 松浦基晴; 來住直人
Oral presentation, English, 電子情報通信学会技術研究報告
Mar. 2011

半導体光増幅器の相互利得変調による多波長信号のNRZ－RZ変換
片渕友哉; 松浦基晴; 來住直人
Oral presentation, English, 電子情報通信学会技術研究報告
Mar. 2011

MWP2010,ECOC2010報告
東野武史; 戸田裕之; 來住直人
Invited oral presentation, Japanese, 電子情報通信学会技術研究報告
Feb. 2011

多波長ラマンソリトン圧縮を用いた40-GHz 3-psの時間及び波長インタリーブパルス生成による光全チャンネル時分割分離
グェン テ クワン; グェン タン フン; 松浦基晴; 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Nov. 2010

A Single-Gate OTDM-to-WDM Conversion Utilizing Raman Compressor-Based Multiwavelength Pulse Sources for Photonic Networks
Hung Nguyen Tan; Quang Nguyen-The; Motoharu Matsuura; Naoto Kishi
Oral presentation, English, 電子情報通信学会技術研究報告
Nov. 2010

Channel-independent performance for simltaneous multichannel wavelength conversion of polarization shift keying signal with different channel group-delay and state of polarization
Md. Nur-Al-Safa Bhuiyan; Motoharu Matsuura; Hung Nguyen Tan; Naoto Kishi
Public symposium, English, Triangle Symposium on Advanced ICT 2010(TriSAI2010), Beijing University of Post and Telecommunication (BUPT), China, Beijing
Oct. 2010

All-optical data format conversion to return-to-zero signal
Quang Nguyen-The; Motoharu Matsuura; Hung Nguyen Tan; Naoto Kishi
Public symposium, English, Triangle Symposium on Advanced ICT 2010(TriSAI2010), Beijing University of Post and Telecommunication (BUPT), China, Beijing
Oct. 2010

All-optical picosecond duration-tunable NRZ-to-RZ data format conversion by using Raman amplifier-based compressor and fiber-based Switch
Quang Nguyen-The; Motoharu Matsuura; Naoto Kishi
Oral presentation, English, 電子情報通信学会技術研究報告
May 2010

半導体光増幅器内で発生するチャーピングの伝送特性に及ぼす影響
北村圭; 松浦基晴; 來住直人
Oral presentation, English, 電子情報通信学会技術研究報告
Feb. 2010

Wavelength conversion and multicasting using SOA for phased array antenna beam-steering
Nanang Krisdianto; Motoharu Matsuura; Naoto Kishi
Oral presentation, English, 電子情報通信学会技術研究報告
Feb. 2010

利得波長帯可変型ラマン増幅と光ファイバ中の自己位相変調を利用した広帯域全光信号再生
松浦基晴; 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告, 海峡メッセ下関, Domestic conference
29 Jan. 2010

Preservation of state of polarization and polarization-insensitive wavelength conversion for polarization shift keying signal, based on four wave mixing in highly non-linear fiber
Md. Nur-Al-Safa Bhuiyan; Motoharu Matsuura; Hung Nguyen Tan; Naoto Kishi
Public symposium, English, Triangle Symposium on Advanced ICT 2009(TriSAI2009), University of Electro-Communifcations (UEC), Japan, Tokyo
Oct. 2009

All optical ultra-short pulsewidth tunable waveform conversion by combination of fiber-based switch and Raman amplifier-based compressor
Quang Nguyen The; Motoharu Matsuura; Naoto Kishi
Oral presentation, Japanese, 2009年電子情報通信学会そさいえてぃ大会
Sep. 2009

光ファイバの伝送特性と非線形現象
來住直人
Others, Japanese, 光ファイバ応用技術展2009 光ファイバ技術セミナー, オプトロニクス社
Apr. 2009

波長変換およびファイバ群遅延を用いた全光可変遅延回路
岩城亜弥子; 松浦基晴; 來住直人
Oral presentation, English, 電子情報通信学会技術研究報告
Mar. 2009

光バーストスイッチングネットワークにおけるリンク負荷・遅延を考慮した経路選択方法
毛利元一; 松浦基晴; 來住直人
Oral presentation, Japanese, 2009年電子情報通信学会総合大会
Mar. 2009

Real-Time Allocation Scheme in Burst Switching Photonic Network
Nattapong Kitsuwan; Eiji Oki; Naoto Kishi; Tetsuya Miki
Oral presentation, English, 電子情報通信学会技術研究報告
Oct. 2008

単一周波数光ファイバレーザの多波長外部光源による周波数制御法
田口勝久; 松浦基晴; 來住直人
Oral presentation, English, 電子情報通信学会技術研究報告
Oct. 2008

光フィルタを用いた半導体光増幅器内で発生するチャーピング特性の評価
北村圭; 松浦基晴; 岩津のぞみ; 來住直人
Oral presentation, English, 電子情報通信学会技術研究報告
Oct. 2008

All-optical wavelength and width-tunable wavelength conversion using nonlinearities in semiconductor optical amplifier and highly nonlinear fiber
Hung Nguyen Tan; Motoharu Matsuura; Naoto Kishi
Public symposium, English, Triangle Symposium on Advanced ICT 2008(TriSAI2008), Information and Communication University (ICU), Korea, Daejeon
Oct. 2008

Time-resolved chirp properties induced by a semiconductor optical amplifier measured with a conventional optical bandpass filter
Motoharu Matsuura; Nozomi Iwatsu; Kei Kitamura; Naoto Kishi
Public symposium, English, Triangle Symposium on Advanced ICT 2008(TriSAI2008), Information and Communication University (ICU), Korea, Daejeon
Oct. 2008

Concept of dynamic-shared allocation with clearing buffer method for real-time mode in burst switched photonic network
Nattapong Kitsuwan; Naoto Kishi; Tetsuya Miki
Oral presentation, English, 2008年電子情報通信学会そさいえてぃ大会
Sep. 2008

光ファイバ非線形現象の光波形変換への応用
來住直人; 松浦基晴; グエン タン フン; ブッディカ プラニース; サマラコーン
Oral presentation, Japanese, 2008年電子情報通信学会そさいえてぃ大会, Invited
Sep. 2008

光ファイバの原理と基礎知識
來住直人
Others, Japanese, 光ファイバ総合技術展 光ファイバ技術セミナー, オプトロニクス社
Apr. 2008

異なる光ネットワーク間の信号伝送のための光信号波長・波形変換方式の研究
來住直人
Others, Japanese, 平成18年度～平成19年度科学研究費補助金 (基盤研究(C)(2)) 研究成果報告書,平成18年度～平成19年度科学研究費補助金 (基盤研究(C)(2)) 研究成果報告書
Apr. 2008

Ultrashort pulse generation from pulse compression by using Raman amplification
Buddhika Praneeth; Samarakoon; Motoharu Matsuura; Naoto Kishi
Oral presentation, English, 電子情報通信学会技術研究報告
Mar. 2008

ヘテロダイン方式光ファイバ無線通信の上り信号伝送実験
中村教人; 松浦基晴; 來住直人; 三木哲也
Oral presentation, Japanese, 2008年電子情報通信学会総合大会
Mar. 2008

波長分割多重伝送における最適単一伝送容量の一検討
奥秀樹; 來住直人; 三木哲也
Oral presentation, Japanese, 2008年電子情報通信学会総合大会
Mar. 2008

半導体光増幅器を用いた波長変換素子による広帯域波長可変光クロックパルスの生成
田口将義; 松浦基晴; 來住直人; 三木哲也
Oral presentation, Japanese, 2008年電子情報通信学会総合大会
Mar. 2008

Concept of overlapping frame on single round reservation in burst switched photonic network
Nattapong Kitsuwan; Naoto Kishi; Tetsuya Miki
Oral presentation, English, 2008年電子情報通信学会総合大会
Mar. 2008

Survivable Optical Broadcast-and-Select Network with Optical Coupler and $1\times2$ Switch based Protection Architecture
Yueping Cai; Motoharu Matsuura; Naoto Kishi; Tetsuya Miki
Oral presentation, English, 2008年電子情報通信学会総合大会
Mar. 2008

波長分割多重伝送における最適単一伝送容量の一検討
奥秀樹; 來住直人; 三木哲也
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Jan. 2008

波長多重伝送における最適単一伝送容量の一検討
奥秀樹; 來住直人; 三木哲也
Oral presentation, Japanese, 2007年電子情報通信学会そさいえてぃ大会
Sep. 2007

光ファイバの原理と基礎知識
來住直人
Others, Japanese, 光ファイバ総合技術展 光ファイバ技術セミナー, オプトロニクス社
Apr. 2007

フォトニック結晶による超多重フォトニックネットワーク技術の研究
三木哲也; 來住直人
Others, Japanese, 平成14～15年度科学研究費補助金 (基盤研究(B)(2)) 研究成果報告書,平成14～15年度科学研究費補助金 (基盤研究(B)(2)) 研究成果報告書
Apr. 2007

多段接続型波長変換素子による信号再生可能な広帯域波長変換ならびにマルチキャスティング
松浦基晴; 來住直人; 三木哲也
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2007

外部注入光を用いた単一周波数光ファイバレーザの周波数制御法
森薫; 松浦基晴; 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2007

外部光を用いた8の字レーザの光双安定動作制御
山口 宏明; 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2007

カスケード接続型波長変換素子を用いた全光マルチキャスティング
松浦基晴; 來住直人; 三木哲也
Oral presentation, Japanese, 2007年電子情報通信学会総合大会
Mar. 2007

半導体光増幅器による広帯域波長変換素子を用いた広波長域ホップ型マルチキャスティング
松浦基晴; 來住直人; 三木哲也
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Nov. 2006

ラマン増幅器を用いたスペクトル拡がりによる多波長パルス生成
Samarakoon, Buddhika; 松浦基晴; 來住直人
Oral presentation, Japanese, 2006年電子情報通信学会そさいえてぃ大会
Sep. 2006

Advanced signal processing and networking technologies for all-optical networks
Naoto Kishi; Motoharu Matsuura; Y.Kishikawa; R.Murahata; M.Taguchi; T.Miki
Public symposium, English, International Symposium on Advanced ICT (AICT2006),, University of Electro-Communications, Tokyo
Aug. 2006

Broadband wavelength conversion using multistage semiconductor-based wavelength converter
Motoharu Matsuura; Naoto Kishi; T.Miki
Public symposium, English, International Symposium on Advanced ICT (AICT2006),, University of Electro-Communications, Tokyo
Aug. 2006

Multi-wavelength pulse generation from supercontinuum spectrum generated by Raman amplification
Buddhika P; Samarakoon; Motoharu Matsuura; Naoto Kishi
Public symposium, English, International Symposium on Advanced ICT (AICT2006),, University of Electro-Communications, Tokyo
Aug. 2006

Photonic Dynamic Path Networks based on Optical Burst Switching
Tetsuya Miki; Naoto Kishi; Motoharu Natsuura; Hideki Oku
Public symposium, English, Workshop in the 11th Optoelectronics and Communications Conference(OECC2006), Workshop in the 11th Optoelectronics and Communications Conference(OECC2006)
Jul. 2006

半導体光増幅器を多段接続させた非線形偏波回転スイッチによる超広帯域波長変換
松浦基晴; 來住直人; 三木哲也
Oral presentation, Japanese, 電子情報通信学会技術研究報告
May 2006

半導体光増幅器を用いたパルス幅可変多波長信号源の伝送特性
松浦基晴; 來住直人; 三木哲也
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2006

外部注入光を用いた単一偏波単一周波数ファイバレーザの周波数制御
趙鵬, 森薫; 曹炳泰; 松浦基晴; 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2006

光バーストネットワークにおける動的帯域制御の実装と評価
村端良平; 高岡和音; 吉野俊哉; 松浦基晴; 來住直人; 三木哲也
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2006

光バーストによるトラフィック適応パスネットワークの実証実験
三木哲也; 來住 直人; 松浦基晴; 梶川實
Oral presentation, Japanese, 2006年電子情報通信学会総合大会
Mar. 2006

光通信及び光計測のための周波数と波形・波長数を制御可能な高機能光信号源
來住直人
Others, Japanese, 平成16年度～平成17年度科学研究費補助金 (基盤研究(C)(2)) 研究成果報告書,平成16年度～平成17年度科学研究費補助金 (基盤研究(C)(2)) 研究成果報告書
Mar. 2006

多段接続型半導体波長変換素子による広帯域波長変換
松浦基晴; 來住直人; 三木哲也
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Feb. 2006

Optical signal processing research in UEC
Naoto Kishi; Yoshiyasu Ueno
Invited oral presentation, English, The International Symposium on Photonics and Advanced Networks (ISPAN 2006), The International Symposium on Photonics and Advanced Networks (ISPAN 2006), Tokyo, Japan, International conference
Jan. 2006

マイクロ波回路解析のためのSパラメータの基礎
來住直人
Others, Japanese, 日本テクノセンター特別セミナー「Sラメータの基礎とその応用・例」, 日本テクノセンター
Jan. 2006

半導体光増幅器を用いた遅延干渉型全光スイッチにおけるパターン効果の影響
岸川雄紀; 松浦基晴; 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Dec. 2005

国際会議ECOC2005報告(光ファイバ・光回路関連)
來住直人
Others, Japanese, 高度情報通信推進協議会 マンスリーセミナー
Oct. 2005

マイクロセル・ホットスポット用光ファイバ無電源中継システムの研究
中嶋信生; 三木哲也; 河野勝泰; 來住直人
Others, Japanese, 第1回戦略的情報通信研究開発推進制度成果発表会, 総務省
Jun. 2005

外部光による8の字レーザの発振状態制御の改善
阿部雄介; 山口宏明; 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2005

遅延干渉型全光スイッチを用いた光同期クロック生成
松浦基晴; 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2005

遅延干渉型半導体光スイッチによる多波長光同期クロック生成
松浦基晴; 來住直人
Oral presentation, Japanese, 2005年電子情報通信学会総合大会
Mar. 2005

無給電光ファイバ無線システムにおける光ファイバ伝送路の単芯化
森本健一; 長田滋; 中山健; 三井宗; 中嶋信生; 河野勝泰; 來住直人; 三木哲也
Oral presentation, Japanese, 2005年電子情報通信学会総合大会
Mar. 2005

ROF伝送による無電源基地局の上り伝送特性の改善
中山健; 長田滋; 森本健一; 河野勝泰; 中嶋信生; 來住直人; 三木哲也
Oral presentation, Japanese, 2005年電子情報通信学会総合大会
Mar. 2005

バースト型フォトニックネットワークにおける優先制御の一検討
杉本元紀; 菅原真司; 來住直人; 三木哲也
Oral presentation, Japanese, 2005年電子情報通信学会総合大会
Mar. 2005

電源を不要とするROF型無線エントランス方式の検討
中嶋信生; 三井宗; 長田滋; 森本健一; 川野晴子; 中山 健; 三木哲也; 河野勝泰; 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2005

バースト型フォトニックネットワークにおける帯域可変範囲拡大法の一検討
佐藤正規; 菅原真司; 來住直人; 三木哲也
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Jan. 2005

全光型光波形変換器を用いた光RZ受信器の特性改善
松浦基晴; 來住直人
Oral presentation, Japanese, 2004年電子情報通信学会そさいえてぃ大会
Sep. 2004

光通信の最先端
來住直人
Others, Japanese, 「あすのまち・三鷹」塾
Sep. 2004

基地局の電源装置を不要とする光ファイバ・無線アクセスシステムの研究
三木哲也; 河野勝泰; 中嶋信生; 來住直人
Others, Japanese, 平成13～14年度科学研究費補助金 (基盤研究(A)(2)) 研究成果報告書,平成13～14年度科学研究費補助金 (基盤研究(A)(2)) 研究成果報告書
May 2004

フォトニックバーストネットワークの優先制御の一検討
杉本元紀; 村端良平; 小笠原崇; 菅原信司; 來住直人; 三木哲也
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Apr. 2004

外部制御光を用いた8の字レーザの発振状態制御
鄭暁科; 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2004

FTTA・ホットスポット用光給電システムの開発
大門真; 河野勝泰; 來住直人; 三木哲也; 中嶋信生
Oral presentation, Japanese, 2004年電子情報通信学会総合大会
Mar. 2004

マイクロ波回路解析の基礎
來住直人
Others, Japanese, 2003 Microwave Workshop and Exhibition (MWE2003) 基礎講座, 電子情報通信学会APMC国内委員会
Nov. 2003

短尺光増幅器における超短光パルスの伝搬特性解析
箭内俊彦; 大谷昭仁; 來住 直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Oct. 2003

ラマンソリトン圧縮を用いたスーパーコンティニューム光による多波長パルス生成
松浦基晴; 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Oct. 2003

光ファイバ給電無線アクセスの検討
林三燮; 宮本優; 青木哲; 中村伸行; 澤和勇貴; 堀内直樹; 雨宮直史; 田中祐樹; 三木哲也; 河野勝泰; 中嶋信生; 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2003

超高速光通信における偏波モード分散補償器の特性解析
奥秀樹; 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2003

バースト型フォトニックネットワークにおけるバーチャルパス構成法の一検討
小笠原崇; 菅原真司; 來住直人; 三木哲也
Oral presentation, Japanese, 2003年電子情報通信学会総合大会
Mar. 2003

FTTAにおける光ファイバ給電システム
中村伸行; 澤和勇貴; 山内雅博; 河野勝泰; 中嶋信生; 來住直人; 三木哲也
Oral presentation, Japanese, 2003年電子情報通信学会総合大会
Mar. 2003

国際会議ECOC2002報告(光源および光信号処理関係)
來住直人
Others, Japanese, 日本学術振興会・光エレクトロニクス第130委員会
Sep. 2002

サニャック形干渉スイッチを用いた光波長ならびにパルス幅変換
松浦基晴; 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告
May 2002

機能性光ファイバ・光導波路の開発動向と計測応用
栗原雅幸; 中村一則; 樋口貞雄; 浅香公雄; 板倉英治; 井上亭; 奥出聡; 來住直人; 黒川隆志; 黒澤潔; 小林功; 曽根勇; 土田英実; 寺井清寿; 肥後尚志; 尾藤洋一; 保立和夫
Others, Japanese, 電気学会技術報告,電気学会技術報告
Apr. 2002

8の字レーザの多ビット発振特性
佐々木浩輔; 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2002

非相反光回路を用いた高安定非線形偏波スイッチング
イスラム エッサン ウル; 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2002

All-Optical Packet Start Recognition and its Application to All-Optical Packet Add/Drop Circuits
Luis Romeu Nunes; Naoto Kishi; Tetsuya Miki
Oral presentation, English, 電子情報通信学会技術研究報告
Nov. 2001

外部注入光制御形光ファイバレーザの制御光強度に対する特性
高橋耕太; 來住直人
Oral presentation, Japanese, 2001年電子情報通信学会そさいえてぃ大会
Sep. 2001

フォトニックバックボーンネットワークにおける光ルーティング法の一検討
ダフィット サントソ; 菅原真司; 來住直人; 三木哲也
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2001

All-optical packet selector prosessing for photonic network nodes
L.R.Nunes; N.Kishi; T.Miki
Oral presentation, English, 2001年度電子情報通信学会総合全国大会一般講演
Mar. 2001

Optical fiber communication systems: an essential infrastructure for 21st century
Naoto Kishi
Keynote oral presentation, English, CAN(Computer Association Nepal) Info Tech 2001, Computer Association Nepal, Kathmandu, Nepal, International conference
Jan. 2001

レーザー・光通信
來住直人; Mahendra Prabuh
Public symposium, Japanese, 研究開発交流会, 電気通信大学 共同研究センター, 横浜国立大学 共同研究推進センター, 調布
Oct. 2000

Modified Split-Step Fourier method for simulating wideband WDM transmission systems
Teeratep Sosakul; 來住直人; 三木哲也
Oral presentation, English, 2000年電子情報通信学会そさいえてぃ大会
Sep. 2000

外部制御光による 8の字レーザの多ビット発振制御
佐々木浩輔; イスラム エッサン ウル; 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Jul. 2000

情報・エネルギーネットワークにおける光計測技術調査報告
永井治男; 栗原雅幸; 堀口常雄; 待鳥誠範; 磯崎克巳; 一色邦彦; 伊藤明; 宇野亭; 小原正孝; 勝川裕幸; 川原行雄; 來住直人; 黒澤潔; 清水栄作; 曽根勇; 田井秀男; 竹内延夫; 土田英実; 寺井清寿; 西川重昭; 西村正幸; 肥後尚志; 古沢明; 逸見直也; 保立和夫; 三浦功; 足立明宏
Others, Japanese, 電気学会技術報告,電気学会技術報告
Jun. 2000

次世代インターネットに親和性を持つフォトニックネットワークの提案
ダフィット サントソ; 菅原真司; 來住直人; 三木哲也
Oral presentation, Japanese, 電子情報通信学会技術研究報告
May 2000

非線形非相反回路を用いた非線形偏波スイッチング
諸晨雷; 來住直人
Oral presentation, Japanese, 2000年度電子情報通信学会春季全国大会一般講演
Mar. 2000

WDMを用いたFTTCの高速化に関する一検討
野口一宙; 來住直人; 三木哲也
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2000

Frequency-controlled and narrow-linewidth operation of a single-frequency fibre laser by using an external light injection
Naoto Kishi; Tomonori Yazaki; Motoharu Matsuura
Public symposium, English, 日中先端情報技術シンポジウム, 日本学術振興会, 東京
Oct. 1999

外部注入光制御形光ファイバレーザの周波数制御特性
松浦基晴; 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告，OFT99-26
Jul. 1999

光トランシーバのパルスレーザならびに近距離用測距センサとしての応用
小林敏倫; 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Feb. 1999

光ファイバ通信
來住直人
Others, Japanese, 電気通信大学公開講座「レーザーが拓く21世紀」
Nov. 1998

外部注入光による光ファイバレーザ安定化に関する検討
松浦基晴; 來住直人
Oral presentation, Japanese, 1998年度電子情報通信学会そさいえてぃ大会一般講演
Sep. 1998

単一パルスを用いたF8レーザの双安定性制御
廣田忠克; 來住直人
Oral presentation, Japanese, 1998年度電子情報通信学会そさいえてぃ大会一般講演
Sep. 1998

外部注入光による単一モード光ファイバレーザの安定化
矢崎智基; 來住直人
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Feb. 1998

受動モード同期ファイバレーザの外部光制御による双安定動作
多田貴; 來住直人; 山下榮吉
Oral presentation, Japanese, 1997年電子情報通信学会春季全国大会一般講演
Mar. 1997

受動モード同期ファイバレーザの外部光制御による双安定動作
多田貴; 來住直人; 山下榮吉
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 1997

非線形光ファイバループによる相関系を用いた光パルス幅測定
河内一浩; 來住直人; 山下榮吉
Others, Japanese, 第25回電通大光ファイバ・レーザ関係研究発表会
Mar. 1997

非線形光ファイバループによる相関系を用いた光パルス測定
河内一浩; 來住直人; 山下榮吉
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Feb. 1997

光サーキュレータを組み込んだ光トランシーバの特性評価
佐野賢史; 來住直人; 山下榮吉
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Feb. 1997

4重不均一コア光ファイバの伝搬特性の解析
西山智宏; 來住直人; 山下榮吉
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Feb. 1997

能動光ファイバリングを用いた光トランシーバの特性評価
佐野賢史; 來住直人; 坂内正宏; 山下榮吉
Oral presentation, Japanese, 1996年電子情報通信学会そさいえてぃ大会一般講演
Sep. 1996

モード整合法による非対称埋め込み型光導波路の特性解析
宮崎徳一; 来住直人; 馬哲旺; 山下榮吉
Oral presentation, Japanese, 1996年電子情報通信学会春季全国大会一般講演
Mar. 1996

非軸対称W形光ファイバを用いた広帯域位相素子の特性解析
來住直人; 山下榮吉
Others, Japanese, 第24回電通大光ファイバ・レーザ関係研究発表会
Mar. 1996

非線形光ファイバループを用いた小電力光パルス幅の測定法
來住直人; 山下榮吉
Others, Japanese, 第23回電通大光ファイバ・レーザ関係研究発表会
Mar. 1995

多数の不均一コアを対称に配置した光ファイバの伝搬特性の解析
田山健一; 來住直人; 山下榮吉
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Feb. 1995

Qスイッチ光ファイバリングレーザによる測距センサの提案
坂内正宏; 來住直人; 山下榮吉
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Feb. 1995

近縮退四光波混合を用いた光波形復元法における非線形効果の影響
來住直人; 山下榮吉
Others, Japanese, 第22回電通大光ファイバ・レーザ関係研究発表会
Mar. 1994

光通信の過去・現在・未来
來住直人
Others, Japanese, 長野県テクノハイランド開発機構電子デバイス高性能化技術講習会
Jan. 1994

レーザヘテロダイン法を用いた周波数と位相を独立に制御可能なマイクロ波発生器
來住直人; 阿河昌弘; 山下榮吉
Oral presentation, Japanese, 1993年電子情報通信学会秋季全国大会
Sep. 1993

位相共役鏡と非線形分散性媒質による光パルスの波形変化
來住直人; 山下榮吉
Others, Japanese, 第21回電通大光ファイバ・レーザ関係研究発表会
Mar. 1993

Quantum well modulators for Thulium doped fibre lasers
R.Mottahedeh; A.J.Seeds; J.S.Roberts; C.C.Button; P.R.Morkel; Naoto Kishi; W.H.Loh
Oral presentation, English, IEE Colloquium on Fibre and Solid State Lasers
May 1992

量子井戸光変調器を組み込んだ希土類ドープ光ファイバレーザ
來住直人
Others, Japanese, 第20回電通大光ファイバ・レーザ関係研究発表会
Mar. 1992

レーザ光による周波数および位相制御可能なマイクロ波発生法の研究
阿河昌弘; 來住直人; 山下榮吉
Others, Japanese, 第20回電通大光ファイバ・レーザ関係研究発表会
Mar. 1992

Modulators for mode-locked fibre lasers
Naoto Kishi; C.N.Pannel
Others, English, U.K. Optoelectronics Research Centre First Internal Colloquium Abstract Digest
Jan. 1991

電磁波問題における群論の応用
來住直人; 山下榮吉
Invited oral presentation, Japanese, 電子情報通信学会技術研究報告
Nov. 1989

偏心コアW形光ファイバを利用した広帯域位相素子
來住直人; 山下栄吉
Oral presentation, Japanese, 1989年電子情報通信学会春季全国大会
Mar. 1989

偏心コアW形光ファイバを利用した広帯域位相素子の提案
來住直人; 山下栄吉
Others, Japanese, 第17回電通大光ファイバ・レーザ関係研究発表会
Mar. 1989

複合媒質平面回路の特性の解析表現
來住直人; 山下栄吉
Oral presentation, Japanese, 電子情報通信学会春季全国大会
Mar. 1988

グリーン関数を用いない境界積分法のTEM線路特性解析への応用
來住直人; 山下栄吉
Oral presentation, Japanese, 昭和62年度電子情報通信学会半導体・材料部門全国大会
Nov. 1987

グリーン関数を用いない境界積分法(第6報) － 重み関数の選択法とスプリアス解についての考察 －
來住直人; 大越孝敬
Oral presentation, Japanese, 電気学会/電子通信学会研究会資料
Oct. 1987

グリーン関数を用いない境界積分法によるサイドトンネル型単一偏波光ファイバの解析
來住直人; 大越孝敬
Oral presentation, Japanese, 電気学会/電子通信学会研究会資料
Apr. 1987

非軸対称光ファイバの伝搬特性に関する研究
來住直人; 大越孝敬
Others, Japanese, 昭和61年度固体エレクトロニクス・オプトエレクトロニクス研究発表会
Mar. 1987

サイドトンネル型単一偏波光ファイバの最適構造
來住直人; 大越孝敬
Public symposium, Japanese, 昭和61年度文部省特定研究『光波利用センシング』第1回シンポジウム, 昭和61年度文部省特定研究『光波利用センシング』第1回シンポジウム, 東京
Jan. 1987

グリーン関数を用いない境界積分法(第4報) － 境界上の端点による計算精度の劣化 －
來住直人; 大越孝敬
Oral presentation, Japanese, 電気学会/電子通信学会研究会資料
May 1986

グリーン関数を用いない境界積分法(第3報) － 複合媒質光ファイバの固有モード解析
來住直人; 大越孝敬
Oral presentation, Japanese, 電子通信学会技術研究報告
Nov. 1985

グリーン関数を用いない境界積分法(第2報) － 光ファイバの固有モード解析への適用 －
來住直人; 大越孝敬
Oral presentation, Japanese, 電気学会/電子通信学会研究会資料
Oct. 1985

グリーン関数を用いない境界積分法定式化の提案
來住直人; 大越孝敬
Oral presentation, Japanese, 電気学会/電子通信学会研究会資料 8
Jul. 1985

多重コア光ファイバ結合特性の群論・ポイントマッチング法による解析
來住直人; 山下栄吉; 厚木和彦
Oral presentation, Japanese, 電子通信学会技術研究報告
Jun. 1984

多重コア光ファイバ結合特性のヒュッケル近似法による解析
來住直人; 山下栄吉; 厚木和彦
Oral presentation, Japanese, 電子通信学会技術研究報告
Jun. 1984

平面回路のポイントマッチング解析法
厚木和彦; 來住直人; 山下栄吉
Oral presentation, Japanese, 昭和58年度電子通信学会総合全国大会
Apr. 1983

Advanced Communication Engineering and Informatics II
Apr. 2014 - Present
The University of Electro-Communications

光通信工学
Oct. 2012 - Present
The University of Electro-Communications

物理学概論第一
Apr. 2010 - Present
The University of Electro-Communications

Advanced optical communication systems
Apr. 2003 - Present
The University of Electro-Communications

物理学概論第二
Oct. 2010 - Mar. 2023
The University of Electro-Communications

情報通信システム実験第二A/電子情報システム実験第二A/情報通信システム実験第二B/電子情報システム実験第二B
Apr. 2012 - Mar. 2020
The University of Electro-Communications

アカデミックリテラシー
Apr. 2017 - Sep. 2019
The University of Electro-Communications

情報通信工学実験B
Oct. 2005 - Mar. 2012

情報通信工学実験A
Apr. 2005 - Sep. 2011

電磁気学第一
Apr. 2000 - Sep. 2010

電磁気学第一演習
Apr. 2000 - Sep. 2010

情報通信工学実験第二
Oct. 2003 - Mar. 2005

情報通信工学実験第一
Apr. 2003 - Sep. 2004

Advanced optoelectronics
Apr. 1993 - Sep. 2002

電磁気学第二
Oct. 2000 - Mar. 2001

電磁気学演習第一
Apr. 1994 - Sep. 1999

電磁気学第一
Apr. 1994 - Sep. 1999

電気数学第一
Oct. 1991 - Mar. 1999

光通信工学
Apr. 1992 - Sep. 1993

電子情報通信学会

The Institute of Electrical and Electronics Engineers

日本光学会

Optical Society of America

微細密集コア光ファイバ構造の波長分散特性の研究
來住 直人
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, The University of Electro-Communications, Scientific research (C), general, Principal investigator, 本研究計画においては、径の微小な複数のコアが、通常の光ファイバのコア径程度の小さな領域に密集して存在する光ファイバ構造を対象とする。この光ファイバ構造においては、それらの複数コア全体が光伝送のための一本のコアの役割を果たしている。このような波長程度の大きさの微細構造を持つ光ファイバは、通常の単一コア光ファイバでは得られない光波伝搬特性を持つ可能性がある。そこで本研究計画では、微細径密集コア光ファイバの光波伝搬特性を、精密な電磁界解析と、それに基づいた試作光ファイバの特性評価により解明する。特性の中でも、主として光ファイバの波長分散特性の光ファイバの構造に対する依存性を明らかにすることに重点を置き、微細密集コア光ファイバの持つ、通常の光ファイバでは実現困難で有用な特性の可能性を追求する。, 19K04508
Apr. 2019 - Mar. 2025

混合フォーマット光通信システムにおける複数フォーマット一括再生機能の研究
Kishi Naoto; Matsuura Motoharu; Quang Nguyen-The; Irneza Ismail; Nguyen Quang Nhu Quynh; Shimazaki Kouhei; Yokota Ryou; Kobayshi Tatsuya; Asano Kouya; Zhang Yingy; Matsumoto Hiroki
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, The University of Electro-Communications, Scientific research (C), general, Principal investigator, There are different signal formats in optical fiber communication networks. In such networks, processing function in network node should work independently from the signal formats, such as intensity- and phase-modulations. In this project, regenerative optical signal processing functions, such as pulsewidth tunable regenerative pulsewidth conversion, optical multicasting function to distribute a single-channel signal to multiple-wavelength channels, conversion of a wavelength-division multiplexing signal to a optical time-division multiplexing signal, and distortion-compensating variable optical delay line to change the timing of the signal, are studied. These processing functions are investigated for phase-modulated signal as well as conventional intensity-modulated signals. The results of the study suggest that most of these functions are applicable independent from the signal formats., 15K06056
Apr. 2015 - Mar. 2018

多フォーマット光通信ネットワークのためのフォーマットフリー光信号処理機能の研究
KISHI Naoto
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, The University of Electro-Communications, Scientific research (B), general, Principal investigator, In optical communication networks, optical node functions are very important which convert the signal wavelength and waveform and/or compensate signal distortions. So far, such optical node functions have assumed the same signal format. On the other hand, there are many signal formats according to the properties of the signal sources and destinations. In this study, optical node functions which allow multiple signal formats were investigated. The research results include realization of (1) wavelength/waveform conversion and waveform reshaping function applicable to various signal modulation formats, (2) polarization- and signal format-independent waveform conversion function, and (3) OTDM(optical time-division multiplexing) to WDM(wavelength-division multiplexing) conversion function., 24360148
Apr. 2012 - Mar. 2015

進化した無線通信技術に柔軟かつ効率的に対応できる光・無線融合基地局ネットワーク基盤の研究開発
山尾泰; 來住 直人; 大木 英司; 松浦基晴
総務省, Coinvestigator
Apr. 2013 - Mar. 2014

光フーリエ変換を用いた低歪み光可変遅延線の研究
KISHI Naoto
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, The University of Electro-Communications, Scientific research (C), general, Principal investigator, Variable optical delay-line is very important for optical signal timing adjustment in optical communication networks. In this study, optical Fourier transformation(OFT) is appliedto such variable optical delay-line to realize distortion-free operation. The characteristics of the OFTincorporatedoptical delay-line, which is realized with a phase modulator, a suitable length of opticalfiber, and a wavelength converter is evaluated. Distortion-free as well as variable time-delay operation of the delay-line is successfully demonstrated., 21560350
Apr. 2009 - Mar. 2012

全光ネットワークのための光信号可変遅延光回路
來住直人
財団法人国際コミュニケーション基金, 研究助成, Principal investigator
Apr. 2007 - Mar. 2009

多波長・広帯域波長変換によるフォトニックネットワーク技術の研究
KISHI Naoto; MIKI Tetsuya; MATSUURA Motoharu
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, The University of Electro-Communications, Scientific research (B), general, Principal investigator, 2007年度は分担, 19360171
Apr. 2007 - Mar. 2009

異なる光ネットワーク間の信号伝送のための光信号波長・波形変換方式の研究
KISHI Naoto
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, The University of Electro-Communications, Scientific research (C), general, Principal investigator, The purpose of the project is to develop optical interfaces to convert the wavelength/waveform of optical signal between different optical networks. The achievements of this project are as follows. With the use of a multi-stage semiconductor optical-amplifier based wavelength converter, large wavelength hopping over 300 nm was achieved for optical signals with bit-rates of 2.5 Gb/s and Gb/s. Waveform regeneration with inverting wavelength conversion was achieved. Multi-casting of optical signal at 1550 nm wavelength band was also demonstrated with the multi-stage wavelength converter, by which signal degradation due to nonlinear-mixing in semiconductor optical amplifier was successfully suppressed. Pulse-width tunable waveform conversion by combination of fiber- and semiconductor-based switches was success-fully applied for NRZ(non return-to-zero) to RZ(return-to-zero) conversion. The output pulsewidth was tunable between 20 ps and 80 ps. Due to the pulsewidth conversion, transmission performance over 20 km was largely improved. As an alternative way for pulsewith-shrinking, Raman amplifier based pulsewidth compressor was also examined. Output pulsewidth tunability for modulated signal between 13 ps and 3 ps was achieved. As an application of waveform conversion technique with a semiconductor optical-amplifier, widely wavelength-tunable optical clock pulse generator was developed. Higher-quality optical clock pulses were obtained in comparison with conventional wavelength-tunable lightsources. Waveform optimization method with this optical clock was also found., 18560330
Apr. 2006 - Mar. 2008

光通信及び光計測のための周波数と波形・波長数を制御可能な高機能光信号源
KISHI Naoto
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, The University of Electro-Communications, Scientific research (C), general, Principal investigator, The purpose of the project is to develop lightsources with controllabilities of their frequencies, waveforms, and number of channels. The achievements of this project are as follows. With the use of semiconductor-amplifier based waveform/wavelength converter, a 16-channel multi-wavelength light-source with variable pulsewidth between 10ps and 90ps were demonstrated. The generated optical signals were successfully applied to transmission over fibers with various dispersion values between - 100ps/nm and 460ps/nm so that the power penalties of received signals were minimized by adjusting the pulsewidths. Pulsewidth optimized signal was also found to be superior to conventionally used optical signal formats. A multi-wavelength fiber laser with an intra-cavity phase modulation was demonstrated. Multi-wavelength output with a good spectral flatness within 5nm was successfully demonstrated. Wavelength conversion with a semiconductor optical amplifier was applied to realize a variable wavelength optical clock in the wavelength range between 1460nm and 1610nm. 10GHz clock signal was successfully obtained with a very high optical signal to noise ratio. Narrow-linewidth single-polarization single-frequency fiber laser controlled by an external light injection was demonstrated. With a proper adjustment of lasing and external light powers, low-drift wavelength tunable operation between 1545nm and 1560nm was achieved. Improvement of multi-wavelength lightsource based on supercontinuum spectrum generation through Raman soliton effect in optical fiber was investigated with the use of seed pulses with shorter pulsewidth. With the use of 1.3ps pulsewidth seed light source, larger bandwidth and better flatness of the generated spectrum was obtained. Detailed characterization of the generated spectrum is still in progress., 16560292
Apr. 2004 - Mar. 2006

トータル光通信の研究開発
三木 哲也; 來住直人
通信・放送機構;情報通信研究機構, Coinvestigator, International joint research
Apr. 1997 - Mar. 2006

マイクロセル・ホットスポット用光ファイバ無電源中継システムの研究
中嶋信生; 三木哲也; 河野勝泰; 來住直人
総務省, Coinvestigator, International joint research
Apr. 2003 - Mar. 2005

フォトニック結晶による超多重フォトニックネットワーク技術の研究
MIKI Tetsuya; KISHI Naoto
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, The University of Electro-Communications, Scientific research (B), general, Coinvestigator, Ultra-wideband optical transmission systems based on wavelength-division-multiplexing (WDM) and its all-optical signal processing techniques are indispensable for future photonic networks. In particular, ultra-wideband wavelength conversion must play an important role to develop such networks. The purpose of this work is to realize ultra-wideband wavelength conversion by utilizing photonic crystal fiber (PCF) and semiconductor optical amplifier (SOA). First, we have studied an ultra-wideband wavelength conversion using PCF We have investigated the wavelength conversion characteristics of the conventional PCF theoretically and experimentally. As a result, we have concluded that it is very difficult to realize an ultra-wideband wavelength conversion with over 60 nm wavelength operating range by using the conventional PCF. To realize over 100 nm wideband wavelength conversion, special PCF with higher nonlinear coefficient and lower chromatic dispersion will be required. Next, we have studied SOA-based wavelength conversion, and proposed a novel technique to realize ultra-wideband wavelength conversion using conventional SOAs. The proposed converter consists of multistage cascaded wavelength converters using SOAs each with different gain band. Each of the cascaded wavelength converters enables us to perform both noninverted (NIV) and inverted (IV) operations. Conversion performance is compared at NIV and IV operations in terms of static characteristics as a function of input/output power of the converter. While good conversion performances are achieved at both operations, the IV wavelength conversion has better cascadability to obtain a high-quality converted signal for the cascaded scheme. Moreover, signal amplitude regeneration is demonstrated by repeating the IV wavelength conversion. Finally, we successfully demonstrate, for the first time, ultra-wideband wavelength conversion, including over 300 nm wavelength hopping to the shorter wavelength side with a triple-stage cascaded wavelength converter. These results indicate that our proposed technique will be useful in improving the flexibility of future ultra-wideband photonic networks., 14350198
Apr. 2002 - Mar. 2004

基地局の電源装置を不要とする光ファイバ・無線アクセスシステムの研究
MIKI Tetsuya; KISHI Naoto; KAWANO Katsuyasu; NAKAJIMA Nobuo
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, The University of Electro-Communications, Scientific research (A), general, Coinvestigator, The purpose of this research program is to propose and study the feasibility of a new radio on fiber access system for high-speed wireless communication without any external electric power supply facilities. The following results were obtained. *With the proposed optical power feeding technique, the electrical power of 15mW and the electric voltage of 2V were obtained. Hence, it is found that all of the electronic/optical components, including a low-noise amplifier and an optical modulator could be successfully driven. *An electroabsorption modulator was employed as the optical modulator at the base station. 10dB sensitivity improvement was achieved with the electrical bias supplied by the fed optical power. *The low-noise amplifier was designed under the condition of small power supply up to 10mW. The maximum gain of 14dB for single-stage, or 22dB for dual-stage was obtained. *With the stimulated Raman effect by the optical power feeding, the optical signal gain more than 2dB was obtained for a 10Km-long optical transmission line. Hence the optical power feeding was found to be effective for optical signal power compensation. Finally, the system experiment was done with the integration of above techniques, which resulted in 22dB sensitivity improvement compared with the existing powerless systems., 13355017
Apr. 2001 - Mar. 2003

光波長多重通信の研究
來住 直人
アンリツ株式会社, Principal investigator, Research commissioned by a company
Apr. 2000 - Mar. 2001

半導体レーザ光注入による光ファイバーレーザの発振周波数安定化と制御
來住 直人
日本学術振興会, 科学研究費助成事業, 電気通信大学, 奨励研究(A), Principal investigator, 周波数安定化された半導体レーザ光の注入による光ファイバレーザの発振周波数の安定化・制御・狭スペクトル線幅動作実現のための新手法の確立およびその性能の評価が目的である。 本年度は、可飽和吸収体を組み込んだリング形およびサニャックループ形エルビウム添加光ファイバレーザを対象として、性能評価を試みた。得られた成果は以下のとおりである。 1. リング形ファイバレーザの発振周波数制御実現の可否要因の探求 発振周波数制御の可否と、共振器の構成の関係を調べるために、A(共振器長20.7m,吸収体長1.2m)とB(共振器長17.5m,吸収体長0.5m)、C(共振器長18.2m,吸収体長1.2m)の三種のレーザ共振器について、周波数制御特性を測定した。その結果、吸収体長が短いB以外の共振器では周波数安定化が可能となり、吸収体長中において発振光と制御光が十分干渉を起こすことが重要なことが明らかとなった。一方、周波数変動についてAとCを比較したところ、Cの方が変動がより低くなり、短共振器化、すなわちレーザ共振器の縦モード間隔を大きくすることにより安定性を改善できることが明らかとなった。 また、外部注入光波長の、自由発振状態の波長からの離調の大きさに周波数安定度が大きく依存し、離調が増大するにつれて周波数安定度が低下することも明らかとなった。 2. サニャックグループ形光ファイバレーザの特性 偏波保存光ファイバによって光増幅器を組み込んだサニャックループ形ファイバレーザを構成し、ループ中への外部光の注入によって引き起こされる利得媒質の飽和を利用したファイバレーザの周波数制御を試みた。しかしながら周波数制御は未だ実現を見ていない。これは、外部注入光の入射時の偏波状態の不安定性に大きな原因があり、実験系の改善が望まれる。, 09750053
Apr. 1997 - Mar. 1999

非線形光ファイバループ回路を用いた光メモリの研究
來住直人
財団法人 カシオ科学振興財団, 研究助成, Principal investigator
Apr. 1996 - Mar. 1997

非線形光ファイバルーブによる小電力光パルス測定法
來住 直人
日本学術振興会, 科学研究費助成事業, 電気通信大学, 奨励研究(A), Principal investigator, 本研究では、非線形光ファイバループ入出力特性の「3乗特性」を用いた自己相関測定系により、微小電力の超短光パルスのパルス幅を簡単に測定するための新しい手法の研究が目的である。本年度の研究成果を以下に記す。 (1)非線形光ファイバループ入出力特性の解析、及びループ中に用いられるEr^<3+>添加光ファイバ増幅器の利得測定により、測定可能な光パルスの条件と非線形光ファイバループのパラメータの間の関係を求めた。その結果、所有する光ファイバとEr^<3+>添加光ファイバ増幅器をループに用いた場合、1mW程度の最大電力を持ち時間幅が1ps程度の微小光パルスの入力に対し、非線形光ファイバループが3乗特性を示し、そのパルス幅の測定が十分可能であることがわかった。これらの解析と測定結果に基づき、非線形光ファイバループの設計を行った。 (2)様々な被測定光パルス形状を考えた場合、自己相関出力として得られる関数の半値幅と被測定光パルスの時間半値幅の比率のばらつきが、通常の2倍高調波を利用した自己相関測定系におけるものよりも小さく、3乗特性の利用により正確なパルス幅の推定が可能であることがわかった。 (3)(1)で設計した非線形光ファイバループを構成し、波長1.55μmの光パルスを用いてその入出力特性を測定した。その結果、最大電力が数mW付近の光パルス入力に対し、入出力特性が3乗特性に近い非線形性を示すことが確認でき、自己相関測定系に利用できることが確かめられた。現在、この非線形光ファイバループを用いた自己相関測定系により光パルス幅の測定を試みている。, 07855007
Apr. 1995 - Mar. 1996

近縮退四光波混合による光パルスの整形もしくは圧縮に関する研究
來住 直人; 来住 直人
日本学術振興会, 科学研究費助成事業, 電気通信大学, 奨励研究(A), Principal investigator, 本研究では、非線形分散性媒質と広帯域の近縮退四光波混合が可能な位相共役波発生器を組み合わせた系における光パルス波形の挙動を調べ、これによって光パルスを整形/圧縮する新しい手法を研究することが目的である。研究成果を以下に記す。 (1)非線形分散性媒質を伝搬したガウス形光パルスが、帯域が無限大で電力反射率が1の位相共役波鏡で反射されて、再び同じ媒質を逆方向に伝搬する場合の光パルス波形の変化を数値解析した。媒質に非線形性が存在する場合も、入射端では元のパルス波形が再現できることがわかった。 (2)上記と同様な系で位相共役鏡に利得あるいは損失がある場合について波形の変化を数値解析した。利得がある場合は入射端に戻ってきたパルス幅は入射時より大きく、損失がある場合は入射時より小さくなることがわかった。したがって損失のある位相共役鏡はパルス圧縮に利用できることがわかった。 (3)波長分散と長さの積が等しい二つの光ファイバ伝送路の中間に帯域が無限大で電力利得が1の位相共役波発生器を置いて光信号の波形歪みを補正する方法における、光ファイバの非線形性の効果について検討した。分散が小さい光ファイバを伝送路として用いた場合はピーク電力が数mW以下ならば、受信端で元の波形がほぼ復元できることがわかった。ことに分散が負の場合は、パルスは常に広がるために光ファイバの非線形効果が小さくなり、前半と後半の光ファイバの分散が大きく異なる場合でも波形の復元が良好に行えることがわかった。 (3)上記の理論の検証のための実験を、光パルス発生器・光ファイバ・位相共役波発生器(半導体レーザ)により試みた。光パルスの電力が小さく、位相共役波発生器の効率が悪いため、波形歪みとその補正効果を観測するには至らなかった。より効率の良い、光ファイバによる位相共役波発生器の構成について検討中である。, 05855043
Apr. 1993 - Mar. 1994

ピコ秒電気パルス効率的発生、伝送、整形、及び圧縮に関する研究
山下 榮吉; 来住 直人
日本学術振興会, 科学研究費助成事業, 電気通信大学, 一般研究(C), Coinvestigator, 本年度の研究実績を以下の通りである。 1.ピコ秒電気パルスの新しい発生方法として非線形性マイクロ波伝送線路におけるソリトン現象を利用することを提案し、このための理論解析及びシミュレーションを行なった。最新のMMIC技術を使用すれば特定の非線形性を持つマイクロ波伝送線路が実現可能となり、これらの非線形性伝送線路において電気ソリトンが発生し、マイクロ波入力信号によりピコ秒オーダーの超短電気パルスまで圧縮できることを示した(1992年電子情報通信学会論文誌発表)。 2.ピコ秒電気パルスは数百ギガ・ヘルツの周波数帯域を持っているため、マイクロストリップなどの伝送線路上を伝搬すると、分散による波形歪みが大きな問題となる。本研究では分散性の少ない伝送線路としてサスペンデッド・コプレーナ導波路を提案し、その波動特性を解析して、パルスの伝搬特性を調べた。従来のマイクロストリップ線路及びコプレーナ導波路に比べて、このサスペンデッド・コプレーナ導波路はピコ秒電気パルスの伝送のために優れた特性を持っていることを理論と実験両面から確認した(1992年IEEE論文誌発表)。 3.MMIC及び超高速デジタル回路を一層高密度化するためには、回路内部の配線間隔を小さくしなければならない。そこで生じる問題は隣接配線の間の信号クロストークである。本研究では二本の任意幅を持つ結合マイクロストリップ線路における超短パルスの歪み及びクロストークを調べた。スペクトル領域法による数値解析を実行し、このような結合線路の中のパルス伝搬特性をコンピュータ・シミュレーションした。また実際に線路パターンを製作して、パルスの波形を測定し、理論解析結果との比較を行なった(1993年IEEE論文誌発表予定)。 4.超短電気パルスの応用を本格的に広げるためには、単純な伝送線路のみならず、種々の線路不連続部ならびに各種デバイスにおけるパルス特性も調べなければならない。本研究ではその一例としてマイクロストリップ分配器を取り上げ、数値解析により得られたSパラメータを用いて、分配器におけるピコ秒電気パルスの波形をシミュレーションと実験の両面から調べた。またこのようなパルス測定によりマイクロ波回路の超広帯域特性を調べる新しい計測方法を提案した(1992年IEEE論文誌発表)。, 04805036
Apr. 1992 - Mar. 1993

光ファイバ型広帯域位相素子の設計法に関する研究
来住 直人
日本学術振興会, 科学研究費助成事業, 電気通信大学, 奨励研究(A), Principal investigator, 01750363
Apr. 1989 - Mar. 1990

モノリシックマイクロ波集積回路の高集積化のためのMCS線路の研究
山下 榮吉; 厚木 和彦; 来住 直人
日本学術振興会, 科学研究費助成事業, 電気通信大学, 一般研究(C), Coinvestigator, 近年のモノリシックマイクロ波集積回路(MMIC)の発展により小形、軽量、高信頼度、および低コストのマイクロ波回路を実現することが可能となって来た。このような小形化のために、ウェーハ当り数百の回路を製作することになるが、その反面、製作後の微調整ができないので正確な解析・設計によって寸法をあらかじめ決定しておかなければならない。このような解析・設計法の開発がこの研究の目的である。 我々の研究で取り扱ったのは、MMICで主として用いられるマイクロストリップ線路が基板上面にある大地導体板に近接する場合の影響である。対象として厚さが100μm程度に薄いGaAs基板を想定しているので、ここでは準TEM波近似を用いた。解析方法としては筆者等が最近提案している方形境界分割法を拡張して用いた。 この解析方法にりGaAs基板上のマイクロストリップ線路について大地導体との近接許容度を定める多数のデータを得た。 この研究で新しく提案したマイクロコプレーナストリップ(MCS)線路は前述の近接効果を線路幅の縮小によって補償する線路であり、その解析と設計の方法は近接効果の評価の場合と殆ど変わらない。今年度の研究では、集積回路に用いられる4種類の基板(GaAs、プラスチック、アルミナ、およびセラミック)についてMCS線路の設計データを計算した。また、近似計算に便利な多項式の形で構造寸法を定める表現式を導出した。 プラスチック基板についてMCS線路のモデルを製作した。特性測定のためにMCS線路測定治具を試作し、Boontonのキャパシタンスメータを併用して測定した結果、MCS線路設計計算値を実証することができた。, 63550288
Apr. 1987 - Mar. 1988

光ファイバ形位相素子
Patent right, 2626726,2626726, Date announced: 18 Apr. 1997

大学模擬授業
Lecturer, 東京都立神代高等学校, 電磁波よもやま話, Visiting lecture
02 Oct. 2024 - 02 Oct. 2024

大学模擬講義
Lecturer, 東京都立昭和高等学校, 電磁波よもやま話, 東京都立昭和高等学校, Visiting lecture, high_school_students, 同校2年生に対して、 卒業後の進路決定に関する関心を高めるために、大学の専門分野に関連する易しい講義を行い、進路決定の参考としてもらう。
04 Oct. 2023 - 04 Oct. 2023

大学模擬講義
Appearance, 東京都立富士高等学校, 電磁波よもやま話, 東京都立富士高等学校, high_school_students, 同校1年生 卒業後の進路決定に関する関心を高めるために、高校1年生に対して、大学の専門分野に関連する易しい講義を行い、進路決定の参考としてもらう。
19 Oct. 2022

大学模擬講義体験
Appearance, 東京都立武蔵野北高等学校, 電磁波よもやま話, 東京都立武蔵野北高等学校, 同校2年生 卒業後の進路決定に関する関心を高めるために、高校2年生に対して、大学の専門分野に関連する易しい講義を行い、進路決定の参考としてもらう。
29 Sep. 2021

大学レクチャー
Appearance, 静岡県立韮山高等学校, 見えない所で現代社会を支える「光ファイバ通信」, 静岡県立韮山高等学校（遠隔実施）, 同校1,2年生
12 Dec. 2020

高校生・受験生のための模擬授業
Appearance, 入試課アドミッションセンター, 本学80周年記念館リサージュ, 高校生40名
01 Oct. 2018

第1回電気通信大学UECスクール
Appearance, 入試課アドミッションセンター, 本学図書館アゴラ, 高校生30名
21 Aug. 2018

平成29年度大学出張講義
Appearance, 栃木県立矢板東高等学校, 見えない所で現代社会を支える「光ファイバ通信」, 栃木県立矢板東高等学校, 同校1,2年生
20 Oct. 2017

平成27年度「ミニ大学」
Appearance, 山梨県立甲府東高等学校, なぜ光ファイバ通信か, 山梨県立甲府東高等学校, 同校1,2年生
19 Oct. 2015

平成27年度大学模擬授業
Appearance, 千葉県立佐原高等学校, なぜ光ファイバ通信か, 千葉県立佐原高等学校, 同校2年生
08 Jul. 2015

平成26年度大学模擬講義
Appearance, 東京都立府中高等学校, なぜ光ファイバ通信か, 都立府中高等学校, 同校2年生
09 Oct. 2014

夢ナビライブ2014仙台「講義ライブ」
Appearance, 株式会社フロムページ, 「光ファイバ通信」なしの日常はあり得ない!, 夢メッセみやぎ 展示棟, 仙台市と近郊の高校生
04 Oct. 2014

東京都立昭和高等学校模擬講義
Appearance, 入試課アドミッションセンター, なぜ「光ファイバ」通信か?, 本学B-202教室, 昭和高校2年生20名 教員1名
17 Jul. 2014

進路講演会
Appearance, 東京都市大学付属等々力高等学校, なぜ「光ファイバ」通信か?, 東京都市大学付属等々力高等学校 教室, 2年生24名 (内女子生徒5名 全員理系クラス)
06 Nov. 2013

平成25年度緑丘プレ大学講座
Appearance, 岩手県立盛岡第三高等学校, なぜ「光ファイバ通信」か?, 岩手県立盛岡第三高等学校, 1,2年生33名 (内女子生徒数名 2年生は全て理系クラス)
09 Oct. 2013

出張講義
Appearance, 東京都立立川国際中等教育学校, なぜ光ファイバ通信か, 東京都立立川国際中等教育学校, 同校5年生(高校2年生相当)
11 Jul. 2012

出張講義
Appearance, 東洋高等学校, なぜ光ファイバ通信か, 学内 オリエントホール, 東洋高等学校在校生:高校3年生 83名(内女子18名) および教職員2名
16 May 2012

出張講義
Appearance, 岩瀬日本大学高等学校, なぜ光ファイバ通信か, 学内 普通教室, 岩瀬日本大学高等学校在校生(1,2年生)
02 Dec. 2011

出張講義
Appearance, 東京都立大泉高等学校, なぜ光ファイバ通信か, 東京都立大泉高等学校, 大泉高等学校在校生(1,2年）
15 Dec. 2010

出張講義
Appearance, 東京都立大泉高等学校, なぜ光ファイバ通信か, 東京都立大泉高等学校, 大泉高等学校在校生
18 Dec. 2009

光ファイバ技術特別セミナー FE-1コース 光ファイバの基礎
Appearance, オプトロニクス社, 光ファイバの伝送特性と非線形現象, 神奈川県横浜市 パシフィコ横浜, 若手の技術者他
22 Apr. 2009

出張講義
Appearance, 東京都立三鷹高等学校, なぜ光ファイバ通信か, 東京都立三鷹高等学校, 三鷹高校在校生
04 Nov. 2008

光ファイバ技術セミナー 光ファイバの基礎(チュートリアルコース)
Appearance, オプトロニクス社, 光ファイバの原理と基礎知識, 横浜, 若手の技術者他
23 Apr. 2008

光ファイバ技術セミナー 光ファイバの基礎(チュートリアルコース)
Appearance, オプトロニクス社, 光ファイバの原理と基礎知識, 若手の技術者・大学院生
26 Apr. 2007

Sラメータの基礎とその応用・例
Appearance, 日本テクノセンター, マイクロ波回路解析のためのSパラメータの基礎, 東京都新宿区 日本テクノセンター, 技術者・研究者
12 Jan. 2006

高度情報通信推進協議会 マンスリーセミナー
Appearance, 高度情報通信推進協議会, 国際会議ECOC2005報告(光ファイバ・光回路関連), 東京都中野区 中野サンプラザ
11 Oct. 2005

「あすのまち・三鷹」塾
Appearance, 三鷹産業プラザ, 光通信の最先端, 東京都三鷹市 三鷹産業プラザ
10 Sep. 2004

MWE2003基礎講座
Appearance, MWE2003事務局, マイクロ波回路解析の基礎, 神奈川研横浜市 パシフィコ横浜, 技術者・研究者・学生
26 Nov. 2003

出張講義
Appearance, 福島県立磐城桜が丘高等学校, なぜ光ファイバ通信か, 福島県立磐城桜が丘高等学校, 磐城桜が丘高等学校在校生
03 Oct. 2002

日本学術振興会・光エレクトロニクス第130委員会
Appearance, 日本学術振興会, 国際会議ECOC2002報告, 東京都新宿区 四谷弘済会館, 関連分野の研究者・技術者
27 Sep. 2002

電気通信大学フォーラム2000研究開発交流会
Appearance, 電気通信大学共同研究センター, レーザー・光通信, 電気通信大学
20 Oct. 2000

レーザーが拓く21世紀
Appearance, 電気通信大学, 光ファイバ通信, 電気通信大学, general
14 Nov. 1998

長野県テクノハイランド開発機構電子デバイス高性能化技術講習会
Appearance, 長野県工業試験所, 光通信の過去・現在・未来, 長野県岡谷市 長野県工業試験所, 技術者
21 Jan. 1994

2023年度メンタルヘルスFD研修への参加
Others, Others, 安全・衛生委員会, 04 Mar. 2024 - 04 Mar. 2024, zoomによるオンライン参加, 栃木衛保健管理センター長による、職場におけるメンタルヘルス対策の講演を聴講し、ストレスチェックの結果の見方と活用法と、大学におけるメンタルヘルスの現状と対策について学んだ。

2023年度 障害学生支援に係るFD研修への参加
Others, Others, 学生支援センター, 19 Feb. 2024 - 19 Feb. 2024, zoomによるオンライン参加, 「障害や疾患をもつ学生への対応のコツと対応指針」に関する、障害学生支援室チーフコーディネーターの阿部朋典氏による講演を聴講し、当該学生に対する対応における注意点を学んだ。

本学の教育の最近の変化に関するFD講演会への参加
Others, Others, 大学教育センター長 村松正和, 07 Feb. 2024 - 07 Feb. 2024, 電気通信大学本館別館第一会議室, 村松副学長(大学教育センター長)による、
1.大括り入試廃止
2.TOEICテストの成績
3.副専攻の設定
4.UEC検定
5.2025年度入学性への対応
6.大学院の英語科目の増加
の項目についての講演を聴講し、本学の教育の最近の変化の状況について学習した。

近年の電通大の入試に関するFD講演会への参加
Others, Others, 大学教育センター, 17 Jan. 2024 - 17 Jan. 2024, 電気通信大学本館別館第一会議室, 成見入試担当副学長による、近年の電通大の入試、ことに大括り入試廃止後の学生の成績分布や、デザイン志向データサイエンスプログラム新設、女子枠,科目「情報」の新設、CBT(computer-based testing)の導入などについての講演を聴講した。, False

研究データ管理に係るFD研修への参加
Others, Others, D.C.&I.戦略推進会議, 13 Sep. 2023 - 13 Sep. 2023, zoomによるオンライン参加, 国立情報学研究所の下山武司特任准教授と江川和子特任研究員の講演を聴講し、研究で得られたデータの管理・利活用に対する認識と対応方法の概要について学んだ。

博士前期課程1年の横田嶺が、電子情報通信学会光ファイバ応用技術研究会の2016年度学生奨励賞を受賞。
2016 - 2016