PhD, The University of Tokyo

理学修士, 東京大学大学院 理学系研究科

energy consumptions

all-optical packet processing

optical-time-division multiplexing (OTDM)

all-optical switches

all-optical gates

semiconductors

Optical-communication's device engineering

Nonlinear optics

High-frequency pulse generators

Ultrafast optical logic gates

Ultrafast optical materials

全光パケット処理

OTDM

光制御

半導体

光通信デバイス設計

非線形光学

高周波光パルス発生回路

高速光ロジックゲート回路

省エネルギー

超高速光材料

Nanotechnology/Materials, Nano/micro-systems

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

Nanotechnology/Materials, Optical engineering and photonics

Apr. 2019 - Mar. 2020
電気通信大学, 情報理工学域III類, 類長

Apr. 2018 - Mar. 2019
電気通信大学, 情報理工学域III類, 副類長

Apr. 2016
電気通信大学大学院, 基盤理工学専攻, 教授

Apr. 2010 - Mar. 2016
Department of Engineering Science, University of Electro-Communications, 先進理工学専攻, Professor

Apr. 2013 - Mar. 2014
電気通信大学大学院, (旧)電子工学専攻, 電子工学専攻主任

Apr. 2009 - Mar. 2010
University of Electro-Communiactions, Graduate School of Electronic Engineering, 電子工学専攻, Professor

Jul. 2002 - Mar. 2009
University of Electro-Communications, Graduate School of Electronic Engineering, 電子工学専攻, Associate Professor

Mar. 2002 - Mar. 2009
University of Electro-Communications, Dept. of Electronic Engineering, 電子工学科, Associate Professor

Oct. 2001 - Feb. 2002
Networking Res. Labs., NEC Corp., Principal Researcher

Jul. 1999 - Sep. 2001
Optoelectronics and High-Frequency Device Res. Labs., NEC Corp., Principal Researcher

Apr. 1987 - Jun. 1999
Opto-Electronics Res. Labs., NEC Corp., Researcher

Jan. 1995 - Mar. 1996
Univ. of Central Florida, CREOL, Adjunct Faculty

Mar. 1987
The University of Tokyo, Graduate School, Division of Science, Department of Physics

Mar. 1985
The University of Tokyo, Faculty of Science, Department of Physics

Apr. 1977 - Mar. 1980
灘高等学校, Japan

Mar. 2019
電気通信大学
電子情報通信学会エレクトロニクスソサイエティ学生奨励賞受賞等
大学院学生表彰(石田耕大氏), 博士前期課程学生石田耕大氏
Others, Japan

Sep. 2018
電子情報通信学会
2波長の5ピコ秒パルスを同時刻に対発生する10GHz繰返し全光半導体ゲート型モード同期レーザ
電子情報通信学会エレクトロニクスソサイエティ学生奨励賞(石田耕大氏), Kodai Ishida;Makoto Takeshita;Kengo Okano;Yoshiyasu Ueno
Japan society

Mar. 2018
電気通信大学同窓会(目黒会)
全光半導体ゲート型位相同期レーザが出力する光周波数コムスペクトルの帯域幅拡大および品質向上に関する研究(修士論文)
目黒会賞(電気通信大学大学院優秀修士論文賞)(竹下諒氏), 竹下諒;大学院博士前期課程研究
Others

Mar. 2016
電気通信大学同窓会(目黒会)
全光半導体ゲート型40GHzピコ秒モード同期レーザシステムの光コム線幅の研究(卒業研究)
目黒会賞(電気通信大学優秀卒業研究賞)(竹下諒氏), 年度学部卒業研
Others

Oct. 2010
Organizers of KAIST (Korea), BUPT (China), and UEC (Japan)
China, Korea, and Japan
Triangle Symposium on Advanced Information Communication Technology (TriSAI2010), Best Paper Award, Yoshiyasu Ueno
International society

Mar. 2003
電気通信大学同窓会(目黒会)
超高速光ロジックゲートにおける光干渉バイアス設計(卒業研究)
目黒会賞(電気通信大学優秀卒業研究賞)(一戸澄雄氏), 戸澄雄;年度学部卒業研
Others

Jul. 2002
The Institute of Electronics, Information, and Communication Engineers, Authors were Y. Ueno, M. Takahashi, K. Suzuki, T. Shimizu, S. Nakamura, A. Furukawa, T. Tamanuki, K. Mori, T. Ae, T. Sasaki, and K. Tajima.
Japan (International Conference)
Best Paper Award of Opto-Electronics and Communications Conference (OECC 2002), Y. Ueno;M. Takahashi;K. Suzuki;T. Shimizu;S. Nakamura;A. Furukawa;T. Tamanuki;K. Mori;T. Ae;T. Sasaki;K. Tajima
International society

May 2001
IEEE
USA
IEEE/LEOS Senior Membership
International society, United States

1999
NEC Corporation, R&D Group, 共同受賞（5名）
NEC Corporation, 2nd-class R&D Award
Others

1996
NEC Corporation, R&D Group, 共同受賞（15名）
NEC Corporation, 1st-class R&D Award
Others

Jul. 1994
Japanese Society of Applied Physics, 共著者全員（Y. Ueno, H. Sawano, S. Kawata, K. Hara, K. Tada, H. Hotta, K. Endo, and K. Kobayashi）の共同受賞。
Low-noise high-power 680-nm laser with sub-GHz frequency response
Best Paper Award of the Optical Memory Symposium, Yoshiyasu Ueno;Hiroyuki Sawano;Seiji Kawata;Kunihiro Hara;Kentaro Tada;Hitoshi Hotta;Kenji Endo;Kenichi Kobayashi
International society

All-optical-gate-type mode-locked few-picosecond pulsed laser with externally injected, weakly modulated optical seed
Kazuyuki Nagahiro; Takaaki Nakane; Hajime Itagaki; Toshinori Shibuya; Kyohei Hirai; Yoshiyasu Ueno
Japan Society of Applied Physics., PS-7-4, 09 Sep. 2014, Peer-reviwed
International conference proceedings, English

Ultrafast distortion-free semiconductor-based all-optical gate that contains optical-spectrum's phase-and-amplitude synthesizer
Takehiro Nishida; Satoshi Shinada; Naoya Wada; Takeru Yamaji; Yoshiyasu Ueno
22nd Annual Meeting of IEEE Photonics Society, 1, paper no. TuB4, Oct. 2009, Peer-reviwed
International conference proceedings, English

200-Gb/s wavelength conversion using a delayed-interference all-optical semiconductor gate assisted by nonlinear polarization rotation
Jun Sakaguchi; Takehiro Nishida; Yoshiyasu Ueno
OPTICS COMMUNICATIONS, ELSEVIER SCIENCE BV, 282, 9, 1728-1733, May 2009, Peer-reviwed, The pattern-induced intensity fluctuation (PIF) of output signals with a bit-rate above 160 Gb/s has been one of the major issues regarding all-optical semiconductor gates. We have demonstrated that the nonlinear polarization rotation (NPR) in the semiconductor optical amplifier (SOA) plays a significant role in the high-frequency operation of a delayed-interference signal-wavelength converter (DISC). We did this using a cross-correlation system whose temporal resolution is 1.5 ps which was developed to monitor our 200-Gb/s, 4992-bit-long binary-patterned waveforms. When we experimentally optimized the NPR effect inside our DISC specially for our 200-Gb/s wavelength conversion. the PIF was significantly improved (from 5.0 to 1.5, for example). Our systematically measured dependence of the PIF on the polarization settings was qualitatively explained with the new gate model that we developed earlier in this work. (C) 2009 Elsevier B.V. All rights reserved.
Scientific journal, English

Analysis of subpulse generation from delayed-interference signal-wavelength converter for wide carrier recovery rate range
Jun Sakaguchi; Mads L. Nielsen; Takashi Ohira; Rei Suzuki; Yoshiyasu Ueno
JAPANESE JOURNAL OF APPLIED PHYSICS, JAPAN SOCIETY APPLIED PHYSICS, 47, 9, 7182-7189, Sep. 2008, Peer-reviwed, The generation of subpulses in delayed-interference signal-wavelength converters (DISCS) had been suspected as a Curse of waveform degradation in their application in ultrafast (similar to 160GHz) optical time division multiplexing (OTDM) communication systems. We reported its first observation in our previous letter. In this paper, after a detailed explanation of our model. experimental method and improved results with respect to those ill the previous letter, we discussed the applicability of our model in a wide range of Carrier recovery rates ill the semiconductor optical amplifier (SOA). Subpulse waveforms were systematically measured for several carrier recovery rates (carrier lifetimes tau(eff) = 11-280 ps), and an increase in subpulse intensify with recovery rate was observed. The calculated intensities showed good agreement with measured data for most recovery rates, which supports our model. Using this model, we numerically showed the trade-off between subpulses and pattern-induced intensity noise, in the same recovery rate range. This trade-off suggests that part of the DISC structure needs improvement.
Scientific journal, English

1.55-um, mode-locked, single-longitudinal-mode, 10-GHz, 2-ps, ultra-short optical pulse train from our original semiconductor-based pulse-source scheme
Ryoichi Nakamoto; Hiroyuki Takeuchi; Jun Sakaguchi; Yoshiyasu Ueno
Nanophotonics 2008, 1, paper no. Nano-08-191, May 2008, Peer-reviwed
International conference proceedings, English

Frequency-dependent electric dc power consumption model including quantum-conversion efficiencies in ultrafast all-optical semiconductor gates around 160 Gb/s
Jun Sakaguchi; Ferran Salleras; Kohsuke Nishimura; Yoshiyasu Ueno
OPTICS EXPRESS, OPTICAL SOC AMER, 15, 22, 14887-14900, Oct. 2007, Peer-reviwed, Based on nine up-to-date types of semiconductor-optical-amplifier (SOA) samples, we devised a power-consumption model of SOA-based all-optical gates as a tool to develop faster and more efficient OTDM systems for bitrates from 10 to 160 Gb/s and those over 160 Gb/s. The conventional effect of a continuous wave (cw) holding beam was included in the model. Furthermore, in this work we defined three step-wise quantum conversion efficiencies eta 1, eta 2, and eta 3 from current-injected carriers through photons. The dependence of each of the three efficiencies on the SOA-structure was studied. The total efficiency eta(T) observed for the nine SOAs ranged widely from 0.07 to 0.46. The validity of the power-consumption model was verified by systematically measuring the effective carrier recovery rate. According to our model, the power consumption of the best existing SOA-based gate for 160-Gb/s signals is 750 mW, and this increases at a rate approximately proportional to (bitrate)(2), and decreases proportionally to (1/eta(T))(2). (C) 2007 Optical Society of America.
Scientific journal, English

Criterion for removing a delayed peak from the ultrafast nonlinear response of photonic crystal/quantum dot waveguides
Ferran Salleras; Masanori Honma; Jun Sakaguchi; Yoshiyasu Ueno; Nobuhiko Ozaki; Yoshinori Kitagawa; Kiyoshi Asakawa; Naoki Ikeda; Yoshimasa Sugimoto
Nonlinear Photonics topical meeting (NP 2007), paper no. NTuC6, Sep. 2007, Peer-reviwed
International conference proceedings, English

Frequency-dependent electric dc power consumption in ultrafast all-optical semiconductor gates
Jun Sakaguchi; Ferran Salleras; Yoshiyasu Ueno
12th Optoelectronics and Communications Conference (OECC 2007), paper no. 10D2-3, Jul. 2007, Peer-reviwed
International conference proceedings, English

Optical-spectrum-synthesizer design within an all-optical semiconductor gate to reduce waveform distortion induced by carrier-cooling relaxation at sub-Teraherz frequencies
Yoshiyasu Ueno; Ryouichi Nakamoto; Jun Sakaguchi; Rei Suzuki
OPTICS EXPRESS, OPTICAL SOC AMER, 14, 26, 12655-12664, Dec. 2006, Peer-reviwed, In frequency ranges above 200-300 GHz, the second slowest relaxation in the optical response (such as carrier-cooling relaxation having a time constant of 1-2 ps) of a semiconductor optical amplifier inside the conventional delayed-interference signal-wavelength converter (DISC) scheme is thought to start the distortion of all-optically gated waveforms. In this work, we design a digital optical-spectrum-synthesizer block that is part of the expanded DISC scheme. Our numerically calculated spectra, waveforms, and eye diagrams with assumed pseudorandom digital data pulses indicate that this synthesizer significantly removes strong distortion from the gated waveforms. A signal-to-noise ratio of 20 dB was obtained from our random-data eye diagram, providing proof of effectiveness in principle. (C) 2006 Optical Society of America.
Scientific journal, English

New method for characterizing the injected-carrier-to-photon conversion efficiencies inside the ultrafast all-optical semiconductor gates
J. Sakaguchi; Y. Ueno; K. Nishimura; T. Yazaki
Optical Amplifiers and their Applications (OAA 2006), paper no. OTuC4, Jun. 2006, Peer-reviwed
International conference proceedings, English

40-GHz mode-locked pulse generation with a new scheme of SOA-based pulse generation
R. Suzuki; T. Ohira; J. Sakaguchi; Y. Ueno
CLEO/QELS 2006, paper no. CMG5, May 2006, Peer-reviwed
International conference proceedings, English

Experimental and theoretical investigation of the impact of ultra-fast carrier dynamics on high-speed SOA-based all-optical switches
ML Nielsen; J Mork; R Suzuki; J Sakaguchi; Y Ueno
OPTICS EXPRESS, OPTICAL SOC AMER, 14, 1, 331-347, Jan. 2006, Peer-reviwed, The impact of ultra-fast carrier dynamics in semiconductor optical amplifiers (SOAs) on switches based on cross-gain and cross-phase modulation is analyzed theoretically and experimentally. We find that ultra-fast effects lead to additional spectral broadening, which improves the optical signal-to-noise ratio for switches based on an SOA and an optical filter. For such switches, the influence of ultra-fast effects on the so-called nonlinear patterning effect is analyzed for three filter configurations: the asymmetric Mach-Zehnder interferometer (AMZI), a band-pass filter (BPF), and a cascade of an AMZI and a BPF. We conclude that fast carrier dynamics dramatically reduces nonlinear patterning and that the successful high-speed (> 100 Gb/s) demonstrations in the literature rely on these effects. (c) 2006 Optical Society of America.
Scientific journal, English

Modeling of the polarization-discriminating-symmetric-Mach-Zehnder-type optical-3R gate scheme and its available degree of random-amplitude-noise suppression
Y Ueno; M Toyoda; R Suzuki; Y Nagasue
OPTICS EXPRESS, OPTICAL SOC AMER, 14, 1, 348-360, Jan. 2006, Peer-reviwed, We have modeled the semiconductor-optical-amplifier (SOA)-based polarization-discriminating-symmetric-Mach-Zehnder (PDSMZ) type (i.e., a UNI-type) 3R gating scheme, and have searched for an optimum set of 3R-gating conditions. Primary parts of the optimum parameters we obtained-such as the interferometer delay time Delta t and the widths of input data and clock pulses in the gate model-matched those from previously reported 3R-loop transmission experiments fairly well. We also found that the 3R-gating mechanism which forms the regenerated output signal differs greatly from what it has been thought to be. Based on this model, we have characterized the available degree of random-amplitude-noise suppression. (c) 2006 Optical Society of America.
Scientific journal, English

Observation of small sub-pulses out of the delayed-interference signal-wavelength converter
Jun Sakaguchi; Mads L. Nielsen; Takashi Ohira; Rei Suzuki; Yoshiyasu Ueno
Japanese Journal of Applied Physics, 44, 44, L1358-L1360, Oct. 2005, Peer-reviwed
Scientific journal, English

Observation of small sub-pulses generated in the DISC-type wavelength converter
J. Sakaguchi; M.L. Nielsen; T. Ohira; R. Suzuki; Y. Ueno
10th Optoelectronics and Communications Conference (OECC 2005), paper 8F1-4, Jul. 2005, Peer-reviwed
International conference proceedings, English

Threshold condition for pulse generation from a DISC-loop-type pulse generator
R. Suzuki; S. Kobayashi; J. Sakaguchi; Y. Ueno
International Conference on Quantum Electronics 2005 and the Pacific Rim Conference on Lasers and Electro-Optics 2005 (IQEC/CLEO-PR 2005), CMF1-4, Jul. 2005, Peer-reviwed
International conference proceedings, English

Theoretical and experimental study of fundamental differences in the noise suppression of high-speed SOA-based all-optical switches
ML Nielsen; J Mork; R Suzuki; J Sakaguchi; Y Ueno
OPTICS EXPRESS, OPTICAL SOC AMER, 13, 13, 5080-5086, Jun. 2005, Peer-reviwed, We identify a fundamental difference between the ASE noise filtering properties of different all-optical SOA-based switch configurations, and divide the switches into two classes. An in-band ASE suppression ratio quantifying the difference is derived theoretically and the impact of the ASE filtering on the optical spectrum is verified experimentally using a hybrid DISC setup. ASE power suppression of around 3 dB over the total signal bandwidth is demonstrated. (C) 2005 Optical Society of America
Scientific journal, English

Reduction of nonlinear patterning effects in SOA-based all-optical switches using optical filtering
M.L. Nielsen; J. Mork; J. Sakaguchi; R. Suzuki; Y. Ueno
Optical Fiber Communication Conference (OFC 2005), paper OThE7, Mar. 2005, Peer-reviwed
International conference proceedings, English

Suppression of pseudorandom timing jitters and wavelength chirping properties after optical 3R gating with a Symmetric Mach-Zehnder gate
R. Suzuki; Y. Nagasue; M. Toyoda; Y. Ueno
9th OptoElectronics and Communications Conference (OECC 2004), paper 13E2-1, pp. 90-91, Jul. 2004, Peer-reviwed
International conference proceedings, English

Theoretically predicted nonlinear phase imbalance for delayed-interference signal-wavelength convertors (DISC)
Yoshiyasu Ueno
Japanese Journal of Applied Physics, 43, 5B, L665-L668, May 2004, Peer-reviwed
Scientific journal, English

Theoretically predicted perfomance and frequency-scaling rule of a Symmetric-Mach-Zehnder optical 3R gating
Y Ueno
OPTICS COMMUNICATIONS, ELSEVIER SCIENCE BV, 229, 1-6, 253-261, Jan. 2004, Peer-reviwed, The performance of an optical 3R gating with a Symmetric-Mach-Zehnder semiconductor gate is predicted from our gating model and a set of realistic component-parameter values. In particular, the trade-off between amplitude-noise suppression and pattern-induced internal noise is demonstrated with an assumed 40-Gb/s input signal. Furthermore, a frequency-scaling rule for the 3R gate is analytically predicted that takes into account the optimum carrier lifetime and the carrier-injection level for the semiconductor-optical amplifiers inside the gate. The predicted scaling rule was numerically confirmed through our simulation, where a signal bit-rate of 160 Gb/s was assumed. (C) 2003 Elsevier B.V. All rights reserved.
Scientific journal, English

Control scheme for optimizing the interferometer phase bias in the Symmetric-Mach-Zehnder all-optical switch (OECC-awarded paper)
Y. Ueno; M. Takahashi; S. Nakamura; K. Suzuki; T. Shimizu; A. Furukawa; T. Tamanuki; K. Mori; S. Ae; T. Sasaki; K. Tajima
IEICE Trans. Electronics, E86-C, 5, 731-740, May 2003, Peer-reviwed
Scientific journal, English

Dependence of nonlinear phase shift on cavity length of SOA for all-optical signal processing
T. Tamanuki; S. Nakamura; Y. Ueno; K. Tajima; S. Ae; K. Mori; H. Hatakeyama; T. Sasaki
Opticl Fiber Communication Conference (OFC 2003), paper ThX4., Mar. 2003, Peer-reviwed
International conference proceedings, English

Control scheme for optimizing the interferometer phase bias in a symmetric-Mach-Zehnder-type all-optical switch
Y Ueno; M Takahashi; S Nakamura; K Suzuki; T Shimizu; A Furukawa; T Tamanuki; K Mori; S Ae; T Sasaki; K Tajima
IEEE PHOTONICS TECHNOLOGY LETTERS, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 14, 12, 1692-1694, Dec. 2002, Peer-reviwed, A control scheme for accurately optimizing (and also automatically stabilizing) the interferometer phase bias of symmetric-Mach-Zehnder (SMZ)-type ultrafast all-optical switches is proposed. In this control scheme, a weak continuous-wave light is used as a supervisory input light and its spectral power ratio at the switch output is used as a bipolar error signal. Our experimental result at 168-Gb/s 16: 1 demultiplexing with a hybrid-integrated SMZ switch indicates the feasibility and the sensitivity of this control scheme.
Scientific journal, English

Nonlinear phase shifts induced by semiconductor optical amplifiers with control pulses at repetition frequencies in the 40-160-GHz range for use in ultrahigh-speed all-optical signal processing
Y Ueno; S Nakamura; K Tajima
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, OPTICAL SOC AMER, 19, 11, 2573-2589, Nov. 2002, Peer-reviwed, In a semiconductor optical amplifier (SOA) with copropagating optical pump pulses, the application of a nonlinear phase shift to optical signals provides the driving force for all-optical interferometric switching. We study, both analytically and experimentally, the dependencies of the nonlinear phase shift on the driving frequency (42-168 GHz) and on the SOA parameters. We have found that the nonlinear phase shift (DeltaPhi(NL)) decreases with the driving frequency but that this decrease is only linear, i.e., DeltaPhi(NL) proportional to f(-1). We have also found that the nonlinear phase shift in the SOA linearly increases with the injection current (I-op), i.e., DeltaPhi(NL)proportional toI(op), even in this ultrahigh-frequency range. (C) 2002 Optical Society of America.
Scientific journal, English

Semiconductor nonlinearities for ultrafast all-optical gating
K Tajima; S Nakamura; Y Ueno
MEASUREMENT SCIENCE AND TECHNOLOGY, IOP PUBLISHING LTD, 13, 11, 1692-1697, Nov. 2002, Peer-reviwed, Various optical nonlinearities in semiconductors are investigated in reference to ultrafast all-optical gating. It is shown that a state-filling-type nonlinearity, such as the band-filling effect (BFE) in a semiconductor, is suitable for many ultrafast gating applications: that is, in conjunction with a recently developed differential phase-modulation (DPM) technique, ultrafast and clean gating with a considerably lower optical excitation than in conventional techniques with ferroelectric materials, for example, is possible. Two methods to use the BFE in the DPM regime were experimentally evaluated. One is to optically pump a semiconductor in order to generate photocarriers, and the other is to use a semiconductor optical amplifier (SOA) to enhance the former BFE by means of stimulated emission. With optical pumping, a gating speed faster than a few hundred femtoseconds is possible, but a pulse energy of a few picojoules is required. This pulse energy can be significantly reduced with the use of an SOA, but in this case the gating speed is also reduced. The gating characteristics, including gating speed, gating energy, wavelength, noise, and linearity in signal intensity, were compared between the two methods for various applications.
Scientific journal, English

Control scheme for optimizing the interferometer phase bias in the Symmetric-Mach-Zehnder all-optical switch
Y. Ueno; M. Takahashi; S. Nakamura; K. Suzuki; T. Shimizu; A. Furukawa; T. Tamanuki; K. Mori; S. Ae; T. Sasaki; K. Tajima
28th European Conference on Optical Communication (ECOC 2002), vol. 2, paper 4.3.2., Sep. 2002, Peer-reviwed
International conference proceedings, English

Experimental demonstration of the compressed optical packet multiplexing scheme
Akira Hasegawa; H. Toda; M. Shikata; Y. Ozeki; Tetsuyuki Suzaki; Yoshiyasu Ueno; Kazuhito Tajima
Journal of Optical Networking, 1, 7, 221-236, Jul. 2002, Peer-reviwed
Scientific journal, English

Control scheme for the optimization of the interferometer phase bias in the Symmetric-Mach-Zehnder all-optical switches (Best Paper Awarded)
Y. Ueno; M. Takahashi; K. Suzuki; T. Shimizu; S. Nakamura; A. Furukawa; T. Tamanuki; K. Mori; S. Ae; T. Sasaki; K. Tajima
7th Optoelectronics and Communications Conference (OECC 2002), 464-466, Jul. 2002, Peer-reviwed
International conference proceedings, English

Hybrid integrated Symmetric Mach Zehnder all-optical switch with phase controllers
K. Suzuki; T. Shimizu; S. Nakamura; Y. Ueno; M. Takahashi; T. Tamanuki; A. Furukawa; T. Sasaki; K. Tajima
The 2002 international meetings on Optical Internet and Photonics in Switching (COIN+PS 2002), paper PS.MoB4, p. 43-45., Jul. 2002, Peer-reviwed
International conference proceedings, English

Error-free all-optical demultiplexing at 336 Gb/s with a hybrid-integrated Symmetric-Mach-Zehnder switch
Shigeru Nakamura; Yoshiyasu Ueno; Kazuhito Tajima
Optical Fiber Communication Conference (OFC 2002), Paper FD3, Mar. 2002, Peer-reviwed
International conference proceedings, English

168-Gb/s all-optical wavelength conversion with a Symmetric-Mach-Xehnder-type switch
S Nakamura; Y Ueno; K Tajima
IEEE PHOTONICS TECHNOLOGY LETTERS, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 13, 10, 1091-1093, Oct. 2001, Peer-reviwed, Error-free all-optical wavelength conversion at 168 Gb/s, which is the highest repetition rate ever reported, has been achieved by using a Symmetric-Mach-Zehnder (SMZ)-type switch. Low-power-penalty 84-Gb/s operation is also demonstrated. The push-pull switching mechanism of the SMZ switch enables such ultrafast operation based on cross-phase modulation associated with the carrier depletion in a semiconductor optical amplifier. The configuration of the Delayed-Interference Signal-wavelength Converter, which is a simplified variant of the SMZ switch, is used in this experiment.
Scientific journal, English

5-ps, 10-GHz pulse generation from an all-optical semiconductor switch embedded in a ring cavity
Y Ueno; S Nakamura; K Tajima
APPLIED PHYSICS LETTERS, AMER INST PHYSICS, 79, 16, 2520-2522, Oct. 2001, Peer-reviwed, We observed spontaneous generation of nearly transform-limited pulses (5 ps, 10 GHz, 1558 nm) from a semiconductor ring oscillator. This oscillator is completely different from conventional mode-locked lasers in that the pulse width is passively determined by a split delay time inside its ring cavity. This is because the ring cavity includes an all-optical semiconductor switch whose window width is determined by the split delay time. (C) 2001 American Institute of Physics.
Scientific journal, English

Error-free demultiplexing at 252 Gbit/s and low-power-penalty, jitter-tolerant demultiplexing at 168 Gbit/s with integrated symmetric Mach-Zehnder all-optical switch
Shigeru Nakamura; Yoshiyasu Ueno; Junichi Sasaki; Kazuhito Tajima
27th European Conference on Optical Communication (ECOC 2001), paper Th.F.2.2., Sep. 2001, Peer-reviwed
International conference proceedings, English

5-ps 10-GHz pulse generation from a new semiconductor ring oscillator with an all-optical semiconductor switch
Yoshiyasu Ueno; Shigeru Nakamura; Kazuhito Tajima
4th Pacific Rim Conference on Lasers and Electro-Optics (CLEO PR2001), paper WIPD1-5, Jul. 2001, Peer-reviwed
International conference proceedings, English

Ultrafast all-optical signal processing with Symmetric Mach-Zehnder type all-optical switches
K Tajima; S Nakamura; Y Ueno
OPTICAL AND QUANTUM ELECTRONICS, SPRINGER, 33, 7-10, 875-897, Jul. 2001, Peer-reviwed, We present Symmetric Mach-Zehnder (SMZ) type all-optical switches: an SMZ all-optical switch, a polarization-discriminating SMZ (PD-SMZ) all-optical switch, and a delayed interference signal wavelength converter (DISC). These switches are capable of ultrafast, low control power, and low chirp switching, which is not restricted by slow relaxation of highly efficient nonlinearities. High repetition operation unrestricted by slow relaxation is also possible for these switches. This is because of a push-pull modulation scheme or sometimes called a differential phase modulation scheme. These three devices are similar, but different in some important aspects, thus a comparison is made among the three. Then semiconductor optical amplifiers (SOAs) are discussed as a nonlinear phase shifter for these devices. Then, ultrafast all-optical signal processing using SOA based SMZs is demonstrated. Error-free demultiplexing from 168 to 10.5 Gbit/s is presented, in which a hybrid-integrated SMZ (HI-SMZ) is used as a demultiplexer. In pulse regeneration experiment, the signal pulses at 84 Gbit/s are regenerated by the PD-SMZ and the regenerated pulses are demultiplexed to 10.5 Gbit/s by the HI-SMZ to verify error-free operation. The retiming capability of this scheme is quantitatively demonstrated. Also presented is error-free all-optical wavelength conversion at 168 Gbit/s using the DISC. These results represent the fastest error-free operations reported to date in each category.
Scientific journal, English

Femtosecond switching with semiconductor-optical-amplifier-based Symmetric Mach-Zehnder-type all-optical switch
S Nakamura; Y Ueno; K Tajima
APPLIED PHYSICS LETTERS, AMER INST PHYSICS, 78, 25, 3929-3931, Jun. 2001, Peer-reviwed, We investigate the effect of intraband carrier dynamics on a nonlinear phase shift induced in a semiconductor optical amplifier (SOA) in terms of its applicability to the Symmetric Mach-Zehnder (SMZ) all-optical switch. Nonlinear phase shifts in an SOA and a passive semiconductor waveguide are compared under control-pulse durations ranging from 3.2 to 0.4 ps. The results show that femtosecond switching with higher efficiency is still possible by using the SOA. We experimentally achieve femtosecond (670 fs), femtojoule (140 fJ) switching with the SOA-based SMZ all-optical switch. (C) 2001 American Institute of Physics.
Scientific journal, English

Symmetric Mach-Zehnder type all-optical switches and ultrafast all-optical signal processing
Kazuhito Tajima; Shigeru Nakamura; Yoshiyasu Ueno
Transactions of the Institute of Electronics, Information and Communication Engineers C, The Institute of Electronics, Information and Communication Engineers, vol. J84-C, 6, 435-450, Jun. 2001, Peer-reviwed, 対称マッハツェンダー(SMZ)型全光スイッチ, すなわちSMZ, 偏光識別SMZ(PD-SMZ), そして遅延干渉信号波長変換器(DISC)に関して詳述する.これらの全光スイッチはプッシュプル動作を特徴とし, 低パワー動作を可能にする高効率光学非線形材料の遅い緩和時間に制限されない超高速スイッチングが可能である.また応用上重要な, 準方形型の低チャープスイッチング窓が可能である.また, SMZを用いた超高速全光信号処理, すなわち168→10.5Gbit/s無エラーDEMUX(集積SMZ使用), 84Gbit/sにおけるゼロペナルティ信号光パルス再生, そして168Gbit/s無エラー全光波長変換に関しても報告する.パルス再生と波長変換実験では, 信号処理後の信号光が超高速であるため, HI-SMZで10.5Gbit/sにDEMUXした後にエラー評価を行った.
Scientific journal, English

Penalty-free error-free all-optical data pulse regeneration at 84 Gb/s by using a symmetric-Mach-Zehnder-type semiconductor regenerator
Y Ueno; S Nakamura; K Tajima
IEEE PHOTONICS TECHNOLOGY LETTERS, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 13, 5, 469-471, May 2001, Peer-reviwed, Penalty-free data-pulse regeneration at 83 Gb/s was achieved down to an error rate level of 1x10(-11) by using a data pattern length of 2(31) - 1. A symmetric-Mach-Zehnder-type all-optical polarization-insensitive semiconductor regenerator was used.
Scientific journal, English

Ultrafast all-optical switching using a frequency shift accompanied by cross-phase modulation in a semiconductor optical amplifier
Shigeru Nakamura; Yoshiyasu Ueno; Kazuhito Tajima
Conference on Lasers and Electro-Optics (CLEO 2001), CWI6, pp. 348-349., May 2001, Peer-reviwed
International conference proceedings, English

Penalty-free error-free all-optical data pulse regeneration at 84 Gb/s with Symmetric-Mach-Zehnder-type semiconductor regenerator
Yoshiyasu Ueno; Shigeru Nakamura; Kazuhito Tajima
Optical Fiber Communication Conference (OFC 2001), paper MG5., Mar. 2001, Peer-reviwed
International conference proceedings, English

対称マッハツェンダー型全光スイッチと超高速全光信号処理
田島; 中村; 上野
電子情報通信学会論文誌C, J84-C, 6, 435-450, 2001, Peer-reviwed
Scientific journal, Japanese

168-Gb/s OTDM wavelength conversion using SMZ-type all-optical switch
Y. Ueno; S. Nakamura; H. Hatakeyama; T. Tamanuki; T. Sasaki; K. Tajima
26th European Conference on Optical Communication (ECOC 2000), vol. 1, pp. 13-14., Sep. 2000, Peer-reviwed
International conference proceedings, English

Ultrafast 168-GHz 1.5-ps 1-fJ Symmetric-Mach-Zehnder-type all-optical semiconductor switch
Yoshiyasu Ueno; Shigeru Nakamura; Kazuhito Tajima
Japanese Journal of Applied Physics, vol. 39, part 2, no. 8A, L806-L808, Aug. 2000, Peer-reviwed
Scientific journal, English

All-optical divided-clock extractor using an ultrafast all-optical symmetric-Mach-Zehnder-type semiconductor switch embedded in an optical loop
Yoshiyasu Ueno; Shigeru Nakamura; Kazuhito Tajima
Japanese Journal of Applied Physics, 39, 8A, L803-L805, Aug. 2000, Peer-reviwed
Scientific journal, English

Error-free all-optical signal regeneration and wavelength conversion at 84Gbps using Symmetric Mach-Zehnder all-optical switches
K. Tajima; S. Nakamura; Y. Ueno
5th Optoelectronics and Communications Conference (OECC 2000), paper PD2-6., Jul. 2000, Peer-reviwed
International conference proceedings, English

Error-free all-optical data pulse regeneration at 84 Gbps and wavelength conversion at 168 Gbps with symmetric Mach-Zehnder all-optical switches
S. Nakamura; Y. Ueno; K. Tajima
Optical Amplifiers and their Applications (OAA 2000), PD4-1., Jul. 2000, Peer-reviwed
International conference proceedings, English

Ultrafast hybrid-integrated symmetric Mach-Zehnder all-optical switch and its 168 Gbps error-free demultiplexing operation
K Tajima; S Nakamura; Y Ueno; J Sasaki; T Sugimoto; T Kato; T Shimoda; H Hatakeyama; T Tamanuki; T Sasaki
IEICE TRANSACTIONS ON ELECTRONICS, IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, E83C, 6, 959-965, Jun. 2000, Peer-reviwed, A newly developed hybrid-integrated Symmetric Mach-Zehnder (HI-SMZ) all-optical switch is reported. For integration, we chose the Symmetric Mach-Zehnder (SMZ) structure rather than the Polarization-Discriminating Symmetric Mach-Zehnder (PD-SMZ) structure which is similar to SMZ but more often used in experiments using discrete optical components. We discuss advantages and disadvantages of SMZ and PD-SMZ to show that SMZ is more suitable for integration. We also discuss about the use of SOAs as nonlinear elements for all-optical switches. We conclude that, although the ultrafast switching capability of SMZ is limited by the gain compression of SOAs, the very low switching energy is more important for practical devices. We then describe the HI-SMZ all-optical switch. This integration scheme has advantages which include low loss, low dispersion silica waveguides for high speed operation and ease in large scale integration of many SMZs with other optical, electrical, and opto-electrical devices. We show that a very high dynamic extinction ratio is possible with HI-SMZ. We also examine HI-SMZ with Ips pulses to show its ultrafast capability. Finally, we describe a 168 to 10.5 Gbps error-free demultiplexing experiment which is to our best knowledge the fastest experiment with an integrated device.
Scientific journal, English

Demultiplexing of 168-Gb/s data pulses with a hybrid-integrated symmetric Mach-Zehnder all-optical switch
S Nakamura; Y Ueno; K Tajima; J Sasaki; T Sugimoto; T Kato; T Shimoda; M Itoh; H Hatakeyama; T Tamanuki; T Sasaki
IEEE PHOTONICS TECHNOLOGY LETTERS, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 12, 4, 425-427, Apr. 2000, Peer-reviwed, We have developed a hybrid-integrated symmetric Mach-Zehnder all-optical switch and evaluated the demultiplexing of 168-Gb/s data pulses at a repetition rate of 10 GHz with this switch. A compact, stable de,ice was realized by assembling semiconductor optical amplifiers as nonlinear waveguides on a planar lightwave circuit in a self-aligned manner, A 6.0-ps switching window needed for 168-Gb/s demultiplexing was provided by the push-pull operation of the symmetric Mach-Zehnder all-optical switch. Demultiplexed signal light showed a high extinction ratio of better than 18 dB, Error-free demultiplexing with a bit error rate of 10(-11) was achieved.
Scientific journal, English

168 Gbps error-free demultiplexing with a hybrid-integrated symmetric Mach-Zehnder all-optical switch
S. Nakamura; Y. Ueno; K. Tajima; J. Sasaki; T. Sugimoto; T. Kato; T. Shimoda; M. Itoh; H. Hatakeyama; T. Tamanuki; T. Sasaki
Optical Fiber Communication Conference (OFC 2000), paper ThF3, Mar. 2000, Peer-reviwed
International conference proceedings, English

Spectral Phase-Locking in Ultrafast All-optical Mach-Zehnder-type Semiconductor Wavelength Converters
Yoshiyasu Ueno; Shigeru Nakamura; Kazuhito Tajima
Japanese Journal of Applied Physics, 38, 11A, L1243-L1245, Nov. 1999, Peer-reviwed
Scientific journal, English

Hybrid integrated symmetric Mach-Zehnder all-optical switch and its ultarafast, high extinction switching
K. Tajima; S. Nakamura; Y. Ueno; J. Sasaki; T. Sugimoto; T. Kato; T. Shimoda; M. Itoh; H. Hatakeyama; T. Tamanuki; T. Sasaki
Electronics Letters, 35, 23, 2030-2031, Nov. 1999, Peer-reviwed
Scientific journal, English

Femtosecond operation of a polarization-discriminating symmetric Mach-Zehnder all-optical switch and improvement in its high-repetition operation
S Nakamura; Y Ueno; K Tajima
IEICE TRANSACTIONS ON ELECTRONICS, IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, E82C, 2, 327-334, Feb. 1999, Peer-reviwed, We experimentally demonstrate the ultrafast and high-repetition capabilities of a polarization-discriminating symmetric Mach-Zehnder (PD-SMZ) all-optical switch. This switch, as well as an original symmetric Mach-Zehnder (SMZ) all-optical switch, is based on a highly efficient but slowly relaxing band-filling effect that is resonantly excited in a passive InGaAsP bulk waveguide. By using a mechanism that cancels out the effect of the slow relaxation, ultrafast switching is attained. We achieve a switching time of 200 fs and demultiplexing of 1.5 Tbps, showing the applicability of the SMZ or PD-SMZ all-optical switches to optical demultiplexing of well over 1 Tbps for the first time. High-repetition capability, which is another important issue apart from the switching speed, is also verified by using control pulses at a repetition rate of 10.5 GHz. We also discuss the use of nonlinearity in a semiconductor optical amplifier to further reduce the control-pulse energy.
Scientific journal, English

対称マッハツェンダー型全光スイッチのフェムト秒動作とその集積化
K. Tajima; S. Nakamura; Y. Ueno; J. Sasaki
レーザ研究, 27, 4, 257-261, 1999, Peer-reviwed
Scientific journal, Japanese

Record low-power all-optical semiconductor switch operation at ultrafast repetition rates above the carrier cutoff frequency
Y Ueno; S Nakamura; K Tajima
OPTICS LETTERS, OPTICAL SOC AMER, 23, 23, 1846-1848, Dec. 1998, Peer-reviwed, The switch repetition-rate Limit of all-optical semiconductor snitches, for which the dynamic extinction ratio decreases with increasing repetition rate, is examined and overcome. The extinction ratio is improved by optimization of the interferometer phase bias, which has previously been set to a. The extinction-ratio increase accompanies a drastic change in the output pulse spectrum. Both the output pulse profiles and the spectra, before and after optimization, are successfully reproduced by simulation. As a result, switch repetition of 42 GHz (2.5 times higher than the semiconductor-carrier cutoff frequency) is achieved by use of 5-ps, 1548-nm pump pulses. What are believed to be record low input pump-pulse energies of 750 aJ (peak power, 140 mu W) at 10 GHz and 6 fJ (1.1 mW) at 42 GHz are used. (C) 1998 Optical Society of America.
Scientific journal, English

Ultrafast all-optical switching based on frequency shift accompanied by the semiconductor band-filling effect
S. Nakamura; Y. Ueno; K. Tajima
IEEE Lasers and Electro-Optics Annual Meeting (LEOS '98), WB4, Dec. 1998, Peer-reviwed
International conference proceedings, English

Ultrafast (200-fs switching, 1.5-Tb/s demultiplexing) and high-repetition (10 GHz) operations of a polarization-discriminating symmetric Mach-Zehnder all-optical switch
S Nakamura; Y Ueno; K Tajima
IEEE PHOTONICS TECHNOLOGY LETTERS, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 10, 11, 1575-1577, Nov. 1998, Peer-reviwed, We demonstrate 200-fs switching and 1,5-Tb/s demultiplexing with a polarization-discriminating, symmetric Mach-Zehnder (PD-SMZ) ah-optical switch. This switch is based on a highly efficient but slowly relaxing hand-filling effect resonantly excited in a passive InGaAsP bulk waveguide. By using a mechanism that cancers out the effect of the slow relaxation, ultrafast switching is realized. The applicability of this mechanism to optical demultiplexing of well over 1 Tb/s is experimentally demonstrated for the first time. High-repetition operation at 10 GHz with the same nonlinearity used for the present ultrafast switching is also verified.
Scientific journal, English

New wavelength converter for picosecond RZ pulses
Yoshiyasu Ueno; Shigeru Nakamura; Kazuhito Tajima; Shotaro Kitamura
24th European Conference on Optical Communication (ECOC ’98), pp. 657-658, Sep. 1998, Peer-reviwed
International conference proceedings, English

Ultrafast (200 fs) and high-repetition (10 GHz) operations of a polarization-discriminating symmetric Mach-Zehnder all-optical switch
S. Nakamura; Y. Ueno; K. Tajima
3rd Optoelectronics and Communications Conference (OECC '98), 15B2-2, pp. 344-345., Jul. 1998, Peer-reviwed
International conference proceedings, English

Increased catastrophic-optical-damage output power for high-power semiconductor lasers coated with high-refractive-index films
Yoshiyasu Ueno
Japanese Journal of Applied Physics, 37, 6A, L646-L648, Jun. 1998, Peer-reviwed
Scientific journal, English

3.8-THz wavelength conversion of picosecond pulses using a semiconductor delayed-interference signal-wavelength converter (DISC)
Y Ueno; S Nakamura; K Tajima; S Kitamura
IEEE PHOTONICS TECHNOLOGY LETTERS, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 10, 3, 346-348, Mar. 1998, Peer-reviwed, A new all-optical semiconductor-band-filling-based converter, named delayed-interference signal-converter (DISC), is proposed, Its speed is not restricted by the carrier lifetime and its structure is very simple: it consists of only two essential components, namely, a semiconductor optical amplifier and a passive split-delay, Using this converter, 3.8-THz-shifted (from 1530 to 1560-nm) 14-ps-long pulses are generated from 1530-nm 140-fJ 0.7-ps pulses with high-conversion efficiency.
Scientific journal, English

Femtosecond all-optical switching using efficient incoherent nonlinearity with slow relaxation
K Tajima; S Nakamura; Y Ueno
MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY, ELSEVIER SCIENCE SA, 48, 1-2, 88-93, Aug. 1997, Peer-reviwed, We describe ultrafast all-optical switching experiments with the symmetric Mach-2ehnder (SMZ) all-optical switch proposed by the authors. A switching speed of 800 femtoseconds (fs) has been achieved, which was limited only by the very large group velocity dispersion of the fiber components used in the experiment. We have also experimentally shown that high repetition operation, much faster than that implied by the relaxation time of nonlinearity, is possible. We examine various factors that possibly limit the switching speed and conclude that a switching speed approaching 100 fs can be expected, We also point out that the well-known figure of merit for optical nonlinear materials is no longer applicable to the present device, because its operation is new and different from conventional all-optical switches. (C) 1997 Elsevier Science S.A.
Scientific journal, English

Second-order susceptibility of Ga0.5In0.5P crystals at 1.5 mu m and their feasibility for waveguide quasi-phase matching
Y Ueno; Ricci, V; GI Stegeman
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, OPTICAL SOC AMER, 14, 6, 1428-1436, Jun. 1997, Peer-reviwed, The second-order susceptibilities (d(ij)) of both ordered and disordered Ga0.5In0.5P semiconductor crystal films epitaxially grown on GaAs substrates are analyzed. Quasi-phase matching based on periodic order-disorder regions is proposed, and the analysis shows that three of the four independent coefficients, namely, d(33)' d(31)', and d(15)' but not d(14)' can be modulated. Maker-fringe experiments were performed at 1.57 mu m to measure these coefficients in the deposited crystals. However, the crystal-film orientation allowed a definitive determination of the d(14)' coefficient (110 pm/V) only and an upper limit of 60 pm/V for d'(33). More-sophisticated experimental techniques are proposed for measuring d'(33). (C) 1997 Optical Society of America.
Scientific journal, English

Large phase shifts due to the chi(2) cascading nonlinearity in large walk-off and loss regimes in semiconductors and other dispersive materials
Yoshiyasu Ueno; George I. Stegeman; Kazuhito Tajima
Japanese Journal of Applied Physics, 36, 5B, L613-615, May 1997, Peer-reviwed
Scientific journal, English

Measurement of the second-order susceptibility of GaInP films at 1.5 um
Yoshiyasu Ueno; George I. Stegeman; Kazuhito Tajima
Quantum Electronics and Laser Science Conference (QELS ’97), QThL4, pp. 203-204, May 1997, Peer-reviwed
International conference proceedings, English

Measurement of the second-order susceptibility of GaInP films at 1.5 um
V. Ricci; Y. Ueno; G. I. Stegeman
Quantum Electronics and Laser Science Conference (QELS '96), QME4, pp. 21-22, Jun. 1996, Peer-reviwed
International conference proceedings, English

Phase-matchable second-order susceptibility of GaInP crystals at 1.5-um
Y. Ueno; V. Ricci; G. I. Stegeman
7th Topical Meeting of the European Optical Society, pp. 185-186, Jan. 1996, Peer-reviwed
International conference proceedings, English

High-speed light sources and detectors for giga-bit per second plastic optical fiber transmission
F. Miyasaka; H. Hotta; Y. Ueno; H. Sawano; K. Kobayashi; M. Yamamoto; M. Tsuji; K. Makita; T. Nyu; S. Yamazaki
Optical Fiber Communication Conference (OFC '95), paper ThG6, Feb. 1995, Peer-reviwed
International conference proceedings, English

Low-loss Bragg-reflector fundamental-transverse-mode confinement in AlGaInP red laser
Y. Ueno
IEEE Journal of Quantum Electronics, 30, 10, 2239-2244, Oct. 1994, Peer-reviwed
Scientific journal, English

High temperature operating characteristics of 680 nm AlGaInP lasers with asymmetric waveguiding structure
K. Tada; H. Hotta; K. Hara; H. Sawano; Y. Ueno; K. Kobayashi
5th Optoelectronics conference (OEC '94), 14D2-5, Jul. 1994, Peer-reviwed
International conference proceedings, English

ACCELERATED AGING FOR ALGAINP VISIBLE LASER-DIODES
K ENDO; K KOBAYASHI; H FUJII; Y UENO
APPLIED PHYSICS LETTERS, AMER INST PHYSICS, 64, 2, 146-148, Jan. 1994, Peer-reviwed, Accelerated aging tests were carried out under constant current conditions at an ambient temperature range of 100-150 degrees C for 670 Mn band AlGaInP visible laser diodes. A degradation rate activation energy of 0.8 eV and an extrapolated lifetime of 10(6) h at 50 degrees C has been obtained. It is reported for the first time that lasing wavelength shifts of up to 20 nm to shorter wavelengths accompanied the threshold current increase. This is attributed to disordering of the natural superlattice in the GaInP active layer.
Scientific journal, English

30-MW 690-NM HIGH-POWER STRAINED-QUANTUM-WELL ALGAINP LASER
Y UENO; H FUJII; H SAWANO; K KOBAYASHI; K HARA; A GOMYO; K ENDO
IEEE JOURNAL OF QUANTUM ELECTRONICS, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 29, 6, 1851-1856, Jun. 1993, Peer-reviwed, This paper presents a high-power 690-nm AlGaInP laser for use in a high-density rewritable-optical-disk memory system. The deterioration of its temperature characteristics, which results from the high-power-oriented laser structure, is improved by using compressively strained GaInP quantum wells as the active layer. Output power of 40 mW is achieved up to 80-degrees-C. Stable fundamental-transverse-mode operation is obtained up to 50 mW. Output-power-induced facet degradation is suppressed by an Al2O3 facet coating. The lasers operate stably at 30 mW at 50-degrees-C for over 2600 h. The mean extrapolated lifetime is 10 000 h.
Scientific journal, English

EFFECT OF THERMAL RESISTIVITY ON THE CATASTROPHIC OPTICAL-DAMAGE POWER-DENSITY OF ALGALNP LASER-DIODES
H FUJII; Y UENO; K ENDO
APPLIED PHYSICS LETTERS, AMER INST PHYSICS, 62, 17, 2114-2115, Apr. 1993, Peer-reviwed, We show that the low catastrophic optical damage power density observed for AlGaInP laser diodes (LDs) (1/2 to 1/2.9 that of AlGaAs LDs) is mainly attributable to the high thermal resistivities of the materials (5.5 times higher than for AlGaAs LDs) by using a thermal runaway model calculation.
Scientific journal, English

OSCILLATOR STRENGTH ENHANCEMENT FOR [110]-POLARIZED LIGHT IN COMPRESSIVELY STRAINED GAINP ORDERED CRYSTALS USED IN ALGAINP LASERS
Y UENO
APPLIED PHYSICS LETTERS, AMER INST PHYSICS, 62, 6, 553-555, Feb. 1993, This letter studies the effect of compressive strain on the polarization-dependent oscillator strength in GaInP CuPt-type ordered crystals. The hole eigenstates are obtained by diagonalizing the total Hamiltonian consisting of the Hamiltonian for ordered GaInP and a perturbed term caused by the strain. Our calculation reveals that the strain squeezes the hole wave function and that the oscillator strength between an electron and the upper-valence-band hole increases for [110]-polarized light. The oscillator strength for [110]-polarized light increases with the strain, reaching 14% at +0.98% strain.
Scientific journal, English

30 mW 690 nm high-power strained-quantum-well AlGaInP laser with Al2O3-coated mirror facets
Y. Ueno; H. Fujii; H. Sawano; K. Endo; K. Kobayashi; K. Hara
13th IEEE international semiconductor laser conference, paper D-28, Sep. 1992, Peer-reviwed
International conference proceedings, English

OBSERVATION OF STRIPE-DIRECTION DEPENDENCE OF THRESHOLD CURRENT-DENSITY FOR ALGAINP LASER-DIODES WITH CUPT-TYPE NATURAL SUPERLATTICE IN GA0.5IN0.5P ACTIVE LAYER
H FUJII; Y UENO; A GOMYO; K ENDO; T SUZUKI
APPLIED PHYSICS LETTERS, AMER INST PHYSICS, 61, 7, 737-739, Aug. 1992, Peer-reviwed, An anisotropy for threshold current densities for AlGaInP laser diodes with CuPt-type natural superlattice (NSL) in a Ga0.51n0.5P active layer, grown on a (001) GaAs substrate, was observed, for the first time. Threshold current densities (J(th)) for laser diodes with stripes in the [110BAR] and [110] direction were 1.35 and 2.10 kA/cm2, respectively. The lasers with a weak NSL formation in the active layer showed a very small anisotropy in J(th). Stripe direction dependence of electroluminescence (EL) polarization properties were also observed for lasers with well-developed NSL. The anisotropies in J(th) and EL polarization properties are attributed to the existence of the NSL in the active layer and the appearance asymmetry previously observed in the NSL.
Scientific journal, English

STABLE 30 MW OPERATION AT 50-DEGREES-C FOR STRAINED MQW AIGAINP VISIBLE LASER-DIODES
Y UENO; H FUJII; H SAWANO; K ENDO
ELECTRONICS LETTERS, IEE-INST ELEC ENG, 28, 9, 860-861, Apr. 1992, Peer-reviwed, High-power strained multiquantum-well (MQW) AlGaInP visible laser diodes (LDs) have been developed. Marked improvements in threshold current density and characteristic temperature have been demonstrated. Very stable 30 mW operation at 50-degrees-C for more than 1000 h has been achieved for transverse-mode stabilised +0.30% lattice-mismatched MQW LDs. The operating current increase rates are less than 10(-4) h-1.
Scientific journal, English

Observation of stripe-direction dependence of threshold current density for AlGaInP laser diodes with CuPt-type natural superlattice in Ga0.5In0.5P active layer
H. Fujii; Y. Ueno; A. Gomyo; K. Endo; T. Suzuki
50th annual device research conference (DRC), paper IVB-5, 1992, Peer-reviwed
International conference proceedings, English

Continuous-wave high-power (75 mW) operation of a transverse-mode stabilised window-structure 680 nm AlGaInP visible laser diode
Y. Ueno; K. Endo; H. Fujii; K. Kobayashi; K. Hara; T. Yuasa
Electronics Letters, 26, 20, 1726-1727, Sep. 1990, Peer-reviwed
Scientific journal, English

632.7nm CW operation of AlGaInP visible laser diodes fabricated on (001) 6-degree-off toward [110] GaAs substrate
K. Kobayashi; Y. Ueno; H. Hotta; A. Gomyo; K. Tada; K. Hara; T. Yuasa
Japanese Journal of Applied Physics, 29, 9, L1669-L1670, Sep. 1990, Peer-reviwed
Scientific journal, English

Novel window-structure AlGaInP visible-light laser diodes with non-absorbing facets fabricated by utilizing GaInP natural superlattice disordering,"
Y. Ueno; H. Fujii; K. Kobayashi; K. Endo; A. Gomyo; K. Hara; S. Kawata; T. Yuasa; T. Suzuki
Japanese Journal of Applied Physics, 29, 9, L1666-L1668, Sep. 1990, Peer-reviwed
Scientific journal, English

Novel window-structure AlGaInP visible LDs with non-absorbing facets formed by disordering of natural superlattice in GaInP active layer
Y. Ueno; H. Fujii; K. Kobayashi; K. Endo; A. Gomyo; K. Hara; S. Kawata; T. Yuasa; T. Suzuki
12th IEEE international semiconductor laser conference, paper C-2, Sep. 1990, Peer-reviwed
International conference proceedings, English

Nonexistence of long-range order in Ga0.5In0.5P epitaxial layers grown on (111)B and (110) GaAs substrates
Gomyo; T. Suzuki; S. Iijima; H. Hotta; H. Fujii; S. Kawata; K. Kobayashi; Y. Ueno; I. Hino
Japanese Journal of Applied Physics, 27, 12, L2370-2372, Dec. 1988, Peer-reviwed
Scientific journal, English

RESONANT RAMAN-SCATTERING IN RED-HGI2 BY POLARIZATION MODULATION SPECTROSCOPY WITH PIEZO-BIREFRINGENT MODULATOR
M KUWATA; Y UENO; N NAGASAWA
JOURNAL OF LUMINESCENCE, ELSEVIER SCIENCE BV, 40-1, 613-614, Feb. 1988, Peer-reviwed
Scientific journal, English

超高速全光スイッチとそれを用いた全光信号処理技術の研究動向
田島一人; 中村滋; 上野芳康
Feb. 2003, 電子情報通信学会誌, 86, 2, 114-119, Japanese, Peer-reviwed, Introduction other

対称マッハ・ツェンダー型全光スイッチとそれを用いた全光信号処理
田島一人; 中村滋; 上野芳康; 浅川潔; 杉本喜正
2003, 光通信技術の最新資料集（ISBN:4-900474-99-1）, 7, Japanese, Peer-reviwed, Introduction other

対称マッハ・ツェンダー型全光スイッチとそれを用いた全光信号処理
田島一人; 中村滋; 上野芳康; 浅川潔; 杉本喜正
Apr. 2002, オプトロニクス, 244, 132-138, Japanese, Peer-reviwed, Introduction other

Ultrahigh-speed Optical Signal Processing with Symmetric-Mach-Zehnder-type All-optical Switches
K. Tajima; S. Nakamura; Y. Ueno
2002, IEEE LEOS News Letter, 16, 4, 43-45, English, Peer-reviwed, Introduction other

対称マッハツェンダー型全光スイッチと超高速全光信号処理
田島; 中村; 上野
2001, 電子情報通信学会論文誌C, J84-C, 6, 435-450, Japanese, Peer-reviwed, Introduction other

対称マッハツェンダー型全光スイッチのフェムト秒動作とその光集積化
田島一人; 中村滋; 上野芳康; 佐々木純一; 杉本宝; 加藤友章; 下田穀; 伊藤正隆; 畠山大; 玉貫岳正; 佐々木達也
We demonstrate 200 fs switching and 1.5Tbps demultiplexing with a polarization-discriminating symmetric Mach-Zehnder (PD-SMZ) all-optical switch. Such ultrafast switching was possible, because the switching speed of PD-SMZ is not restricted by slow relaxation time of the highly efficient bandfilling nonlinearity in semiconductors. These results indicate all-optical demultiplexing well exceeding 1 Tbps would be possible. We also report on photonic integration of SMZ, using the Planer Lightwave Circuit technology. With a photonically integrated SMZ, we achieved an extinction ratio better than 12 dB. Its switching speed was limited only by the measurement system in the present experiment, but we anticipate true picosecond switching would be possible., The Laser Society of Japan, 1999, レーザー研究, 27, 4, 257-261, Japanese, Peer-reviwed, Introduction other, 0387-0200, 130003702667

半導体の非線形光学効果と超高速全光スイッチ
田島一人; 中村滋; 上野芳康
Mar. 1998, 光学, 27, 3, 127-133, Japanese, Peer-reviwed, Introduction other

光ディスク用低雑音高出力680nm赤色レーザ －サブGHz高周波変調対応－
上野芳康
Oct. 1994, O plus E, 10, pp. 68-70, Japanese, Peer-reviwed, Introduction other, 80007851969

30 MW 690 NM HIGH-POWER STRAINED QUANTUM-WELL ALGAINP LASER
Y UENO; H FUJII; H SAWANO; K KOBAYASHI; K HARA; A GOMYO; K ENDO
A high-power 690 nm AlGaInP laser has been successfully developed for use in a high-density rewritable optical disk memory system. Laser characteristics are improved by using strained Quantum Wells (QWs) as the active layer. 40 mW output power is achieved at up to 80-degrees-C. Stable fundamental-transverse-mode operation is obtained at up to 50 mW. The lasers demonstrate 30 mW stable operation at 50-degrees-C for over 2,600 hours. The mean extrapolated lifetime is as long as 10(4) hours., NEC CORPORATION, Jul. 1992, NEC RESEARCH & DEVELOPMENT, 33, 3, 393-400, English, Introduction other, 0547-051X, WOS:A1992JW56700017

Optical sensor system for dilute acetylene molecules whose specific pair of absorption lines is identified with high-resolution by weakly-wavelength-modulated optical-comb-like line components
Yosuke Konishi; Naoki Takahashi; Kento Yasui; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), remote online conference, Domestic conference
Sep. 2022

Mode-locked pulsed laser that generates pair of optical-frequency-comb-spectra at very near frequency distance for use in higher-resolution molecule sensors
Kento Yasui; Yosuke Konishi; Toru Akita; Chihiro Sato; Naoki Takahashi; Wang Chaoyi; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), remote online conference, Domestic conference
Sep. 2022

Molecular sensor system using wavelength modulated optical frequency comb
Naoki Takahashi; Yosuke Konishi; Kodai Ishida; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), remote online conference, Domestic conference
Mar. 2022

Broadband, narrow-linewidth, optical-frequency-tunable mode-locked-pulsed optical-frequency-comb source based on strongly nonlinear semiconductor optical amp
Yoshiyasu Ueno; Yusuke Minamide; Makoto Takeshita; Yuki Setagawa; Kodai Ishida; Kengo Okano; Kyosuke Nagasaka; Yushi Suzuki; Naoki Takahashi; Wang Chaoyi
Nominated symposium, Japanese, 電子情報通信学会ソサイエティ大会、OPE-LQE共催企画シンポジウム「狭線幅光源とその応用」, The Institute of Electronics, Information, and Communication Engineers (IEICE), Domestic conference
17 Sep. 2021

Molecule-sensor system in which couple of 177-GHz-spaced lines filtered from optical-frequency-comb lines probes Acetylene's identifier lines
Naoki Takahashi; Chaoyi Wang; Kyosuke Nagasaka; Yushi Suzuki; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), remote online conference, Domestic conference
Sep. 2021

Frequency-response-measurement system containing coherent broadband optical-frequency-comb light source (BW>500 GHz) for characterizing innovative beyond-100-Gb/s transmitters
Chaoyi Wang; Naoki Takahashi; Kyosuke Nagasaka; Yushi Suzuki; Haisong Jiang; Kiichi Hamamoto; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), Online conference, Domestic conference
Mar. 2021

Molecule-sensing scheme in which pair of distant comb-lines (delta 174 GHz) from alloptical semiconductor gate resonantly crosses acetylene-molecule's counterpart-pair of absorption lines
Naoki Takahashi; Wang Chaoyi; Kyosuke Nagasaka; Yushi Suzuki; Kodai Ishida; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), Online conference, Domestic conference
Oct. 2020

All-optical conversion method for dramatically improving the degree of coherence of 10-GHz-spaced comb-like optical frequency components generated by adiabatically compressed soliton pulses
Yushi Suzuki; Kyosuke Nagasaka; Chaoyi Wang; Kengo Okano; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), HIgashi-Hiroshima city, Hiroshima prefecture, Japan, Domestic conference
Mar. 2020

Frequency-response-measurement system containing un-chirped optical-frequency-comb-spectrum light source (BW>500GHz) for characterizing beyond-100-Gb/s optical signal transmitters
Chaoyi Wang; Kyosuke Nagasaka; Yushi Suzuki; Naoki Takahashi; Makoto Takeshita; Kiichi Hamamoto; Haisong Jiang; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), HIgashi-Hiroshima city, Hiroshima prefecture, Japan, Domestic conference
Mar. 2020

Simplifying DISC-type all-optical-converter by using polarization maintaining fiber and reflective semiconductor optical amplifier
Naoki Takahashi; Kyosuke Nagasaka; Yushi Suzuki; Chaoyi Wang; Yukihiro Ishii; Kodai Ishida; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), HIgashi-Hiroshima city, Hiroshima prefecture, Japan, Domestic conference
Mar. 2020

Molecule-sensor in which few narrow optical-frequency-comb-line components from all-optical semiconductor gate precisely crosses this molecule's few inherent absorption lines
Kyosuke Nagasaka; Kodai Ishida; Kengo Okano; Yushi Suzuki; Naoki Takahashi; Makoto Takeshita; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), Kagoshima city, Kagoshima prefecture, Japan., Domestic conference
Oct. 2019

One-Teraherz-wide, 10-Gigaherz-spaced, mode-locked-diode-laser-induced, optical-frequency-comb-line components each of whose line-widths is inherently stabilized to that (2 MHz) of internal continuous-wave seed light (invited)
Yoshiyasu Ueno
Invited oral presentation, English, International Union of Radio Science (URSI)-Japan Radio Science Meeting (JRSM), URSI-JRSM2019, Invited, The Institute of Electronics, Information, and Communication Engineers (IEICE), The University of Electro-Communications, Tokyo, International conference
05 Sep. 2019

Frequency-response-measurement system containing unchirped-comb-seed laser (BW>500 GHz) for characterizing beyond-100-GHz optical transmitters
Kyosuke Nagasaka; Yukihiro Ishii; Kengo Okano; Makoto Takeshita; Bingzhou Hong; Tomotaka Mori; Kiichi Hamamoto; Yushi Suzuki; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), Toyonaka city, Osaka, Japan, Domestic conference
Sep. 2019

All-optical-converter method to dramatically improve otherwise-poor coherence of optical-frequency-comb spectra generated by commercially-available mode-locked silica-fiber-soliton laser
Yushi Suzuki; Kengo Okano; Kyosuke Nagasaka; Makoto Takeshita; Chaoyi Wang; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), Toyonaka city, Osaka, Japan, Domestic conference
Sep. 2019

Physical working model which reproduces well how all-optical-gate-based mode-locked laser's output quantum efficiency behaves with its physical parameters
Koudai Ishida; Kengo Okano; Kyosuke Nagasaka; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), Tokyo, Japan, Domestic conference
Mar. 2019

1.5-um all-optical-gate-based single-cavity-mode mode-locked pulsed laser's unexpectedly small degree of tolerence to cavity-frequency detuning and its working principles
Kengo Okano; Koudai Ishida; Kyosuke Nagasaka; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), Tokyo, Japan, Domestic conference
Mar. 2019

All-optical-semiconductor-gate-based mode-locked pulsed laser structure for 1.3-um-wavelength band in addition to conventional ones for 1.55-um band
Kyosuke Nagasaka; Koudai Ishida; Kengo Okano; Yushi Suzuki; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), Tokyo, Japan, Domestic conference
Mar. 2019

Study of our all-optical-gate-type mode-locked laser's ring-laser-cavity configuration for modelling and then enhancing its output quantum-conversion efficiency
Koudai Ishida; Kengo Okano; Kyosuke Nagasaka; Ganbat Batkhuyag; Yukihiro Ishii; Makoto Takeshita; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), Saga city, Japan., Domestic conference
Oct. 2018

Control scheme for otherwise slowly randomly drifting single-cavity-mode-frequency position in frequency-comb spectrum from 2-ps, 10-GHz, all-optical-gate-type mode-locked laser
Kengo Okano; Kodai Ishida; Yushi Suzuki; Kyosuke Nagasaka; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), Tokyo, Japan, Domestic conference
Sep. 2018

Control scheme for aligning SOA input signal's polarization direction to SOA's waveguide-axis direction inside picosecond, GigaHerz, all-optical-gate-type mode-locked-laser's cavity structure
Kyosuke Nagasaka; Kodai Ishida; Kengo Okano; Yukihiro Ishii; Tatsuyuki Kowaguchi; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), Tokyo, Japan, Domestic conference
Sep. 2018

All-optical-gate-type mode-locked laser cavity structure that generates pairs of 2.2-THz-separated two-color 5-ps pulses precisely synchronously in principle at 10-GHz repetition frequency
Kodai Ishida; Makoto Takeshita; Kengo Okano; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), Tokyo, Japan, Domestic conference
Mar. 2018

The cause of around-one-GHz-spaced split in the custom high-precision high-finesse etalon's transmission spectrum placed inside our 40-GHz harmonically mode-locked laser cavity
Kengo Okano; Tatsuyuki Kowaguchi; Makoto Takeshita; Kodai Ishida; Yuki Setagawa; Yusuke Minamide; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), Tokyo, Japan, Domestic conference
Mar. 2018

1-THz bandwidth, 10-GHz spaced optical frequency combs generated from all-optical-gate-based semiconductor mode-locked lasers.
Makoto Takeshita; Koudai Ishida; Kengo Okano; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), Kumamoto city, Japan., Domestic conference
Oct. 2017

Study on all-optical-gate-based semiconductor mode-locked laser’s tolerance to each of detuning frequencies between this laser’s total four eigen-frequencies for stabilizing its single ring-cavity-mode operation.
Kengo Okano; Makoto Takeshita; Koudai Ishida; Yusuke Minamide; Yuki Setagawa; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), Kumamoto city, Japan., Domestic conference
Oct. 2017

Optical-frequency-tunable, all-optical-gate-type, narrow-linewidth mode-locked laser
Koudai Ishida; Makoto Takeshita; Tatsuyuki Kowaguchi; Kengo Okano; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), Tokyo, Japan, Domestic conference
Sep. 2017

Universality of our semiconductor-based Gigaherz-repetition few-picosecond clock-pulse source and its precise optical-frequency-comb spectrum, for use in broadband telecom and molecule-sensor systems (invited talk)
Yoshiyasu Ueno
Invited oral presentation, English, Joint conference of 24th Opto-Electronics and Communications Conference (OECC), and 12th Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)., Invited, IEEE, Optical Society of America (OSA), IEICE, Japan Society of Applied Physics., Singapore., International conference
31 Jul. 2017

20世紀・21世紀のレーザー応用物理研究の躍進とその基礎科学側面
Yoshiyasu Ueno
Public discourse, Japanese, 私立灘高等学校・灘中学校(神戸市東灘区)の土曜講座講演会。, 私立灘高等学校・灘中学校, 兵庫県神戸市東灘区。, Domestic conference
24 Jun. 2017

Stability of the fundamental longitudinal-mode output from high-quality 10-GHz-repetition picosecond mode-locked diode laser with high-Finesse etalon
Koudai Ishida; Makoto Takeshita; Kengo Okano; Yuki Setagawa; Shota Kawakami; Yusuke Minamide; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), Nagoya city, Japan., Domestic conference
Mar. 2017

Fundamental-longitudinal-mode operation of semiconductor-optical-amp-based 40-GHz mode-locked diode laser by observing its frequency-down-converted RF spectrum
Makoto Takeshita; Koudai Ishida; Kengo Okano; Yusuke Minamide; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), Nagoya city, Japan., Domestic conference
Mar. 2017

Narrow line-widths of third-order comb-components in optical-frequency-comb spectrum generated by our Giga-Herz all-optical-gate-based mode-locked pulsed laser
Kengo Okano; Koudai Ishida; Makoto Takeshita; Shota Kawakami; Yuki Setagawa; Yusuke Minamide; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), Miyazaki city, Japan., Domestic conference
Oct. 2016

Quality of all-optical-gate-based mode-locked laser pulses which depends on degrees of resonance between three independent eigen-frequencies
Makoto Takeshita; Koudai Ishida; Kengo Okano; Yuki Setagawa; Yusuke Minamide; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), Sapporo city, Japan., Domestic conference
Sep. 2016

Observed dependence of our mode-locked pulse laser's output waveform on the detuning ratio of externally injected sub-harmonic microwave modulation frequency by using cross-correlation.
Yusuke Minamide; Makoto Takeshita; Yuki Setagawa; Kazuyuki Nagahiro; Toshinori Shibuya; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), Fukuoka city, Japan., Domestic conference
Mar. 2016

Line-width quality of each of optical comb components from our home-made, high-precision, all-optical-gate-based, 40-GHz pico-second mode-locked laser system
Makoto Takeshita; Yusuke Minamide; Yuki Setagawa; Toshinori Shibuya; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), 別府国際コンベンションセンター, 大分県別府市。, Domestic conference
29 Oct. 2015

Observed dependence of our Giga-Herz picosecond mode-locked pulse laser's output waveform on the detuning ratio of externally injected sub-harmonic microwave modulation frequency
Yusuke Minamide; Toshinori Shibuya; Yuki Setagawa; Makoto Takeshit; Nazuyuki Nagahiro; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), 東北大学 川内北キャンパス, 宮城県仙台市。, Domestic conference
08 Sep. 2015

All-optical logic gates that are strongly accelerated by degenerate cw-light injection
Takaaki Nakane; Hajime Itagaki; Yusuke Minamide; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), 立命館大学 びわこ・草津キャンパス, 滋賀県草津市。, Domestic conference
10 Mar. 2015

100-GHz, 2-ps pulse generation from all-optical-gate-type mode-locked pulse laser
Yusuke Minamide; Hajime Itagaki; Kazuyuki Nagahiro; Toshinori Shibuya; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), 立命館大学 びわこ・草津キャンパス, 滋賀県草津市。, Domestic conference
10 Mar. 2015

Studies on upper limit of all-optical semiconductor gate’s cutoff frequency after optically accelerating more strongly, along with enhancing current injection rate for compensating for thus accelerated electron-hole recombination rate
Hajime Itagaki; Yusuke Minamide; Kazuyuki Nagahiro; Jun Sakaguchi; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), 長崎歴史博物館, 長崎市。, Domestic conference
30 Oct. 2014

同一波長CW光加速方式を用いた100Gb/s全光OR論理ゲートの出力特性評価
Takaaki Nakane; Yusuke Minamide; Kazuyuki Nagahiro; Kenta Sugiura; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), 徳島大学, 徳島市。, Domestic conference
23 Sep. 2014

外部変調微弱化による全光ゲート型パルス発生器出力時間波形歪の改善
Yusuke Minamide; Hajime Itagaki; Kazuyuki Nagahiro; Toshinori Shibuya; Kyohei Hirai; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), 徳島大学, 徳島市。, Domestic conference
23 Sep. 2014

All-optical-gate-type mode-locked few-picosecond pulsed laser with externally injected, weakly modulated optical seed
Kazuyuki Nagahiro; Takaaki Nakane; Hajime Itagaki; Toshinori Shibuya; Kyohei Hirai; Yoshiyasu Ueno
Oral presentation, Japanese, Japan Society of Applied Physics, Japan Society of Applied Physics, 青山学院大学 相模原キャンパス, 神奈川県相模原市。, Domestic conference
17 Mar. 2014

光半導体の高密度励起電子の誘導再結合に基づく毎秒200ギガ級全光ゲート特性研究および周波数可変な光周波数コム光源開発
上野芳康
Public discourse, Japanese, 電子情報通信学会 九州支部講演会, Invited, 電子情報通信学会 九州支部, 九州大学 筑紫キャンパス, Domestic conference
23 Oct. 2013

Advantages in degenerate optical-acceleration scheme for semiconductor-based all-optical gates
Takaaki Nakane; Hajime Itagaki; Kazuyuki Nagahiro; Kenta Sugiura; Keita Yoshikawa; Yoshiyasu Ueno
Oral presentation, Japanese, Japan Society of Applied Physics
Sep. 2013

Advantages in stabilizing two SOA-fiber complings in all-optical gate experiments with heat-compensation scheme
Hajime Itagaki; Takaaki Nakane; Masakazu Kobayashi; Keita Yoshikawa; Yoshiyasu Ueno
Oral presentation, Japanese, Japan Society of Applied Physics
Sep. 2013

Dependence of output waveform from all-optical-gate-type mode-locked pulse laser on its degree of external modulation
Kyohei Hirai; Takahiro Arai; Keita Yoshikawa; Shota Sakano; Yoshiyasu Ueno
Oral presentation, Japanese, Japan Society of Applied Physics
Mar. 2013

Stabilized waveguide-coupling scheme under temperature control with using micro-heater chip for accelerating ultrafast all-optical semiconductor gates
Keita Yoshikawa; Yasutaka Nakahara; Hiroyuki Takeuchi; Yoshiyasu Ueno
Oral presentation, Japanese, Japan Society of Applied Physics
Mar. 2013

Ultrafast all-optical-gate-type mode-locked pulse laser without using any optical-fiber amps
Kyohei Hirai; Takahiro Arai; Keita Yoshikawa; Yoshiyasu Ueno
Public symposium, English, 7th International Symposium on Advanced Information and Communication Technology (TriSAI 2012), UEC (Japan), KAIST (Korea), and BUPT (China)., Tokyo Japan
Sep. 2012

Dependences of dc-power consumptions in ultrafast all-optical semiconductor gates on their input-data's optical center frequencies
Shota Sakano; Kyohei Hirai; Nguyen Tuan Anh; Yoshiyasu Ueno
Public symposium, English, 7th International Symposium on Advanced Information and Communication Technology (TriSAI 2012), UEC (Japan), KAIST (Korea), and BUPT (China)., Tokyo Japan
Sep. 2012

Filter-profile designs for semiconductor-based spectrum-synthesizer-type all-optical gates in optical-acceleration scheme
Akira Yamamoto; Shota Sakano; Keita Yoshikawa; Ryunosuke Hayami; Masakazu Kobayashi; Satoshi Shinada; Naoya Wada; Yoshiyasu Ueno
Oral presentation, Japanese, Japan Society of Applied Physics
Mar. 2012

Dependence of semiconductor all-optical gate's dc power consumptions on input-data's wavelength
Shota Sakano; Nguyen Tuan Anh; Keita Yoshikawa; Yoshiyasu Ueno
Oral presentation, Japanese, Japan Society of Applied Physics
Mar. 2012

Ultrafast all-optical-gate-type mode-locked pulse laser without using any optical-fiber amps
Kyohei Hirai; Takahiro Arai; Keita Yoshikawa; Yoshiyasu Ueno
Oral presentation, Japanese, Japan Society of Applied Physics
Mar. 2012

Energy consumption levels in 300-Gb/s-class signal processors
Yoshiyasu Ueno; Nguyen Tuan Anh; Shota Sakano
Public symposium, English, 電気通信大学・東京農工大学・第８回合同シンポジウム, 電気通信大学・東京農工大学 共催, 東京
Dec. 2011

Crude future vision of 300-GHz optical micro-processor units
Yoshiyasu Ueno
Invited oral presentation, Japanese, 第4回東北大学光科学技術フォーラム, 東北大学・光GCOEプログラム(東北大学電気通信研究所)
Nov. 2011

Optical-signal-processing devices research for optical-communication and computation systems
Yoshiyasu Ueno
Others, English, Invited Lecture, organized by Prof. Taro Arakawa., Prof. Taro Arakawa's research group, Yokohama Nationa University, Yokohama city, Kanagawa.
Oct. 2011

Optical-signal-processing devices research for optical-communication and computation systems.
Yoshiyasu Ueno
Others, English, Invited Lecture, organized by Prof. Yong Liu., School of Optoelectronics and Information, University of Electronic Science and Technology of China (UESTC), Chengdu, China.
Sep. 2011

Optoelectronics-and-photonics engineering research projects, for international-level students (MsC and DC) in National University of Electro-Communications, and, for international industry.
Yoshiyasu Ueno
Others, English, Invited Lecture, organized by Prof. Shanjian Zhang., School of Optoelectronics and Information, University of Electronic Science and Technology of China (UESTC), Chengdu, China.
Sep. 2011

2-ps, 10-GHz mode-locked laser with semiconductor optical amp, ring cavity, and sinusoidally modulated light injection
Takahiro Arai; Kyohei Hirai; Yoshiyasu Ueno
Public symposium, English, 6th International Symposium on Advanced Information and Communication Technology (TriSAI 2011), KAIST (Korea), BUPT (China), and UEC (Japan), Daejeon Korea
Aug. 2011

Improvement of output pulse waveforms in all-optical-gate-type pulse generator with external modulation
Takahiro Arai; Kyohei Hirai; Kenta Sugiura; Nguyen Tuan Anh; Yoshiyasu Ueno
Oral presentation, Japanese, Japan Society of Applied Physics
Aug. 2011

Crude future vision of 300-GHz optical micro-processor unit
Yoshiyasu Ueno
Others, English, Invited Lecture, organized by Prof. Jong-In Shim., Dept. of Electronics and Communication Engineering, Hanyang University, Ansan campus, Korea
Aug. 2011

光スイッチ
上野芳康
Others, Japanese, 財団法人光産業技術振興協会(OITDA),2010年度光技術動向調査報告書
Mar. 2011

100-Gb/s all-optical OR gate utilizing optical acceleration with cw light whose wavelength matches to that of input-data signal
Kenta Sugiura; Keita Yoshikawa; Nguyen Tuan Anh; Shota Sakano; Takeru Yamaji; Jun Sakaguchi; Yoshiyasu Ueno
Oral presentation, Japanese, Japan Society of Applied Physics
Mar. 2011

All-optical-gate-type pulse generator with external modulation
Takahiro Arai; Kenta Sugiura; Nguyen Tuan Anh; Kyohei Hirai; Yoshiyasu Ueno
Oral presentation, Japanese, Japan Society of Applied Physics
Mar. 2011

Crude future vision of 300-GHz optical micro-processor units
Yoshiyasu Ueno
Invited oral presentation, Japanese, SEMICON Japan, Semiconductors Equipment and Materials International (SEMI)
Dec. 2010

Molecule-sensing scheme in which pair of distant comb-lines (delta 174 GHz) from all optical semiconductor gate resonantly crosses acetylene-molecule's counterpart-pair of absorption lines
Naoki Takahashi; Wang Chaoyi; Kyosuke Nagasaka; Yushi Suzuki; Kodai Ishida; Yoshiyasu Ueno
Oral presentation, Japanese, The Institute of Electronics, Information, and Communication Engineers (IEICE), The Institute of Electronics, Information, and Communication Engineers (IEICE), Online conference, Domestic conference
Oct. 2010

Degree of optical acceleration in all-optical gate with cw light whose wavelength matches to that of input-data signal
Kenta Sugiura; Takeru Yamaji; Nguyen Tuan Anh; Shota Sakano; Takehiro Nishida; Yoshiyasu Ueno
Public symposium, English, 5th International Symposium on Advanced Information and Communication Technology (TriSAI 2010), BUPT (China), UEC (Japan), and KAIST (Korea), Beijing China
Oct. 2010

cw laser light source with three-cascaded etalons for characterizing broad-band nonlinear complex-refractive-index modulations in ultrafast semiconductor optical amps
Nguyen Tuan Anh; Shota Sakano; Kenta Sugiura; Mika Inoue; Yoshiyasu Ueno
Public symposium, English, 5th International Symposium on Advanced Information and Communication Technology (TriSAI 2010), BUPT (China), UEC (Japan), and KAIST (Korea), Beijing China
Oct. 2010

Crude future vision of 300-GHz optical micro-processor units
Yoshiyasu Ueno
Public symposium, English, 5th International Symposium on Advanced Information and Communication Technology (TriSAI 2010), BUPT (China), UEC (Japan), and KAIST (Korea), Beijing China
Oct. 2010

Roadmap of ultrafast energy-saving optical semiconductor devices to Year 2025 (invited talk)
Yoshiyasu Ueno
Invited oral presentation, English, 42nd International Conference on Solid Sate Devices and Materials (ssdm2010), Japan Society of Applied Physics (JSAP), Tokyo, Japan, International conference
Sep. 2010

cw laser light source with three-cascaded etalons for characterizing broad-band complex refractive indexes of semiconductor optical amps
Nguyen Tuan Anh; 坂野将太; 杉浦賢太; 井上美佳; 上野芳康
Oral presentation, Japanese, 応用物理学会,第71回応用物理学会学術講演会
Sep. 2010

Degree of optical acceleration in all-optical gate with cw light whose wavelength matches to that of input-data signal
山路健瑠; 杉浦賢太; Nguyen Tuan Anh; 坂野将太; 西田武洋; 上野芳康
Oral presentation, Japanese, 応用物理学会,第71回応用物理学会学術講演会
Sep. 2010

今後の高速・省エネ光半導体デバイス
上野芳康
Invited oral presentation, Japanese, 第326回マンスリーセミナー, (財)光産業技術振興協会(OITDA)
Jul. 2010

西暦2025年の高速・省エネ光半導体デバイス
上野芳康
Invited oral presentation, Japanese, 応用物理学関係連合講演会、フォトニックICT研究会企画シンポジウム「省エネルギー化社会とフォトニックICT」, 応用物理学会
Mar. 2010

Photonics Research in National Univ. of Electro-Communcations (UEC)
Yoshiyasu Ueno
Others, English, Workshop between School of Information Science and Technology, Tsinghua University, and University of Electro-Communications, School of Information Science and Technology, Tsinghua University, and University of Electro-Communications.
Mar. 2010

Ultrafast distortion-free semiconductor-based all-optical gate that contains optical-spectrum's phase-and-amplitude synthesizer
Takehiro Nishida; Satoshi Shinada; Naoya Wada; Takeru Yamaji; Yoshiyasu Ueno
Public symposium, English, 電気通信大学・東京農工大学・第６回合同シンポジウム, 電気通信大学・東京農工大学 共催, 東京
Dec. 2009

Ultrafast distortion-free semiconductor-based all-optical gate that contains optical-spectrum's phase-and-amplitude synthesizer
Takehiro Nishida; Satoshi Shinada; Naoya Wada; Takeru Yamaji; Yoshiyasu Ueno
Public symposium, English, 4th Triangle Symposium on Advanced Information and Communication Technology (TriSAI 2009), UEC (Japan), BUPT (China), and KAIST (Korea), Tokyo, Japan
Oct. 2009

高速全光ゲートの第２時定数誘起波形歪を取り除く独自方式の実験検証
西田武洋; 品田聡; 和田尚也; 山路健瑠; 上野芳康
Oral presentation, Japanese, 応用物理学会,第70回応用物理学会学術講演会
Sep. 2009

1.3-μ帯バルク型半導体光導波路における光位相・光強度変調量の波長依存性
本間正徳; Ferran Salleras; Nguyen Tuanh Anh; 上野芳康; 尾崎信彦; 浅川潔
Oral presentation, Japanese, 電子情報通信学会,レーザ・量子エレクトロニクス(LQE)研究会
May 2009

Ultrafast, low-energy-consumption, semiconductor-based, all-optical gate devices (invited talk)
Yoshiyasu Ueno; Jun Sakaguchi; Ryoichi Nakamoto; Takehiro Nishida
Invited oral presentation, English, 4th Asia-Pacific Microwave Photonics Conference (APMP 2009), National Nature Science Foundation of China, IEEE LEOS, etc., Beijing, China, International conference
Apr. 2009

Fundamental research of 300-Gb/s-class, semiconductor-based all-optical gate scheme which contains complex-amplitude spectrum synthesizer
Takehiro Nishida; Satoshi Shinada; Naoya Wada; Takeru Yamaji; Ryoichi Nakamoto; Yoshiyasu Ueno
Public symposium, English, 電気通信大学・東京農工大学第５回合同シンポジウム, 東京農工大学・電気通信大学 共催, 東京
Dec. 2008

Experimental research of a 300-Gb/s-class, semiconductor-based all-optical gate which contains an optical-spectrum’s amplitude-and-phase synthesizer
Takehiro Nishida; Ryoichi Nakamoto; Jun Sakaguchi; Satoshi Shinada; Naoya Wada; Yoshiyasu Ueno
Public symposium, English, International Symposium on Advanced Information and Communication Technology (TriSAI 2008), ICU (Korea), BUPT (China), and UEC (Japan), Daejeon, Korea
Oct. 2008

Physical factors that define the preciseness required in our original, semiconductor-laser cavity scheme for generating 5-picosecond, 40-GHz, optical clock pulses
Hiroyuki Takeuchi; Ryoichi Nakamoto; Jun Sakaguchi; Takashi Ohira; Yoshiyasu Ueno
Public symposium, English, International Symposium on Advanced Information and Communication Technology (TriSAI 2008), ICU (Korea), BUPT (China), and UEC (Japan), Daejeon, Korea
Oct. 2008

Recent trends in the 200-Gb/s-class, 10-pJ/bit, compact, all-optical semiconductor gate devices research
Yoshiyasu Ueno
Public symposium, English, International Symposium on Advanced Information and Communication Technology (TriSAI 2008), ICU (Korea), BUPT (China), and UEC (Japan), Daejeon, Korea
Oct. 2008

超高速半導体光ゲート研究の進展と将来展望
上野芳康
Invited oral presentation, Japanese, 電子情報通信学会ソサイエティ大会、OCS-OPE-LQE共催企画シンポジウム『光通信における最新極限技術』, 電子情報通信学会
Sep. 2008

非線形偏光回転を利用したDISC型半導体全光ゲートでの200Gb/s波長変換
坂口淳; 西田武洋; 上野芳康
Oral presentation, Japanese, 応用物理学会,第69回応用物理学会学術講演会
Sep. 2008

Recent research activities in our Ultrafast Optical Logic Laboratory in National Univ. of Electro-Communications, Tokyo
Yoshiyasu Ueno
Others, English, Seminar in the COER instutute, Centre for Optical and Electromagnetic Research (COER), Zhejiang University, Hangzhou, P.R. China
May 2008

「エネルギー使用合理化技術戦略的開発／エネルギー有効利用基盤技術先導研究開発／超低エネルギー・超高速光蓄積デバイス技術の研究開発(平成17～19年度）」成果報告書（筑波大学、産業技術総合研究所、電気通信大学、日本電気株）
受託研究者一同共著
Others, Japanese, 独立行政法人新エネルギー・産業技術総合開発機構(NEDO)、省エネルギー技術開発部ご担当
May 2008

半導体全光ゲートを利用する受動的モードロックパルス発生器の単一縦モード発振達成
中本亮一; 竹内宏幸; 坂口淳; 上野芳康
Oral presentation, Japanese, 応用物理学会,第55回応用物理学関係連合講演会
Mar. 2008

超高速光ゲート型パルス発生器のCW発振防止条件のモデル化
竹内宏幸; 中本亮一; 坂口淳; 上野芳康
Oral presentation, Japanese, 応用物理学会,第55回応用物理学関係連合講演会
Mar. 2008

超高速光通信デバイスの動作速度と消費電力概論
Yoshiyasu Ueno
Invited oral presentation, Japanese, フォトニックネットワーク(PN)研究会、チュートリアル講演会, 電子情報通信学会、フォトニックネットワーク(PN)研究会
Dec. 2007

Strongly accelerated nonlinear-optical responses of quantum dots embedded in semiconductor photonic-crystal waveguides
Ferran Salleras; Masanori Honma; Jun Sakaguchi; Yoshiyasu Ueno; Nobuhiko Ozaki; Yoshinori Kitagawa; Yoshiaki Takata; Kiyoshi Asakawa; Naoki Ikeda; Yoshimasa Sugimoto
Public symposium, English, International symposium on coherent optical science, Univ. of Electro-Communications, Chofu, Japan
Dec. 2007

Semiconductor-based all-optical wavelength conversion with long-pattern 200-Gb/s waveform monitoring technique
Jun Sakaguchi; Takashi Ohira; Yoshiyasu Ueno
Public symposium, English, International symposium on coherent optical science, Univ. of Electro-Communications, Chofu, Japan
Dec. 2007

Semiconductor mode-locked pulse generator with intra-cavity high-finesse etalon
Ryoichi Nakamoto; Takashi Ohira; Yoshiyasu Ueno
Public symposium, English, International symposium on coherent optical science, Univ. of Electro-Communications, Chofu, Japan
Dec. 2007

Picosecond-class nonlinear refractive-index recoveries in quantum-dot waveguides measured with a heterodyne pump-and-probe technique
Masanori Honma; Ferran Salleras; Jun Sakaguchi; Yoshiyasu Ueno; Nobuhiko Ozaki; Yoshiaki Takata; Yoshinori Kitagawa; Kiyoshi Asakawa
Public symposium, English, 電気通信大学・東京農工大学第４回合同シンポジウム, 東京農工大学・電気通信大学 共催, 東京
Dec. 2007

半導体導波路素子に基づく超高速全光ゲートとその応用研究
上野芳康
Public symposium, Japanese, 電気通信大学・東京農工大学第４回合同シンポジウム, 東京農工大学・電気通信大学 共催, 東京
Dec. 2007

半導体光増幅器内の量子効率とそれを考慮した超高速全光ゲートの消費電力モデル
坂口淳; Ferran Salleras; 上野芳康
Oral presentation, Japanese, 電子情報通信学会,電子情報通信学会、 レーザ・量子エレクトロニクス（LQE）研究会
Dec. 2007

「フォトニックネットワーク技術の開発(平成14～18年度)」事後評価報告書
研究評価委員一同共著
Others, Japanese, 経産省／新エネルギー・産業技術総合開発機構(NEDO) 研究評価委員会
Nov. 2007

Response characterization of integrated nano-structured semiconductor waveguides aiming at 40-Gb/s optical memories
F. Salleras; M. Honma; J. Sakaguchi; Y. Ueno; N. Ozaki; Y. Kitagawa; K. Asakawa; N. Ikeda; Y. Sugimoto
Public symposium, English, International Symposium on Advanced Information and Communication Technology (AICT 2007), BUPT (China), UEC (Japan), and ICU (Korea), Beijing, China
Sep. 2007

160-GHz-class optical-clock circuit with semiconductor optical amplifiers
R. Nakamoto; R. Suzuki; T. Ohira; J. Sakaguchi; Y. Ueno
Public symposium, English, International Symposium on Advanced Information and Communication Technology (AICT 2007), BUPT (China), UEC (Japan), and ICU (Korea), Beijing, China
Sep. 2007

Trends in 160-Gb/s OTDM materials and circuits research and our on-going research activities in UEC
Y. Ueno; J. Sakaguchi; T. Ohira; F. Salleras; R. Nakamoto
Public symposium, English, International Symposium on Advanced Information and Communication Technology (AICT 2007), BUPT (China), UEC (Japan), and ICU (Korea), Beijing, China
Sep. 2007

SOA内の量子効率を考慮した超高速全光ゲートの消費電力モデル
坂口淳; Ferran Salleras; 上野芳康
Oral presentation, Japanese, 応用物理学会,第68回応用物理学会学術講演会
Sep. 2007

Criterion for removing a delayed peak from the nonlinear response of photonic crystal/quantum dot waveguides
Ferran Salleras; Masanori Honma; Jun Sakaguchi; Yoshiyasu Ueno; Yoshinori Kitagawa; Nobuhiko Ozaki; Kiyoshi Asakawa; Naoki Ikeda; Yoshimasa Sugimoto
Oral presentation, English, 応用物理学会,第68回応用物理学会学術講演会
Sep. 2007

Our circuits-and-materials research activities for use in OTDM network systems that will start from 160 Gb/s
Yoshiyasu Ueno
Others, English, Colloquium in the COBRA instutute, COBRA instutute, Eindhoven Univ. of Technology (TU/e), Eindhoven, the Netherlands
Sep. 2007

超高速全光ゲート動作中の半導体光増幅器内部の電子－光子変換効率
坂口淳; Ferran Salleras; 上野芳康
Public symposium, Japanese, 東京農工大学・電気通信大学21世紀大学COEプログラム第３回合同シンポジウム, 東京農工大学・電気通信大学 共催, 東京
Dec. 2006

Expanded-DISC方式による超高速波長変換の理論設計
中本亮一; 坂口淳; 上野芳康
Public symposium, Japanese, 東京農工大学・電気通信大学21世紀大学COEプログラム第３回合同シンポジウム, 東京農工大学・電気通信大学 共催, 東京
Dec. 2006

DISC型半導体全光変換器を利用した40GHz, 2psモードロックパルス発生
上野芳康; 鈴木励; 大平高志; 坂口淳
Public symposium, Japanese, 東京農工大学・電気通信大学21世紀大学COEプログラム第３回合同シンポジウム, 東京農工大学・電気通信大学 共催, 東京
Dec. 2006

Injected-carrier-to-photon quantum conversion efficiencies inside the picosecond-class all-optical semiconductor gates
J. Sakaguchi; F. Salleras; Y. Ueno
Public symposium, English, International Sympoium on Advanced Information and Communication Technology (AICT 2006), Univ. of Electro-Communications, Tokyo
Aug. 2006

超高速全光ゲート動作中の半導体光増幅器内部の電子－光子変換効率
坂口淳; 上野芳康; 西村公佐; 矢崎智基
Oral presentation, Japanese, 応用物理学会,第67回応用物理学会学術講演会
Aug. 2006

SOA-XPMスペクトル合成方式による超高速波長変換の理論設計
中本亮一; 坂口淳; 上野芳康
Oral presentation, Japanese, 応用物理学会,第67回応用物理学会学術講演会
Aug. 2006

40-GHz mode-locked pulse generation with a new scheme of SOA-based pulse generators
Yoshiyasu Ueno
Others, Japanese, Seminar in the Advanced Opto-electronics Laboratory, NTT Photonics Laboratories, NTT, Atsugi city, Kanagawa
Jun. 2006

40-GHz mode-locked pulse generation with a new scheme of SOA-based pulse generators
Yoshiyasu Ueno
Others, English, Seminar in the research groups of Profs. John Bowers, Daniel Blumenthal and Larry Coldren, University of California Santa Barbara (UCSB), Santa Barbara, California, USA
May 2006

トータル光通信技術の研究開発、平成17年度委託研究最終成果報告書
受託研究者一同共著
Others, Japanese, 郵政省／独立行政法人情報通信研究機構／財団法人テレコム先端技術研究支援センター(SCAT)
Apr. 2006

サブテラヘルツ周波数の光論理ゲートの基礎研究（基盤研究(B)）、平成15年度-平成17年度科学研究費補助金研究成果報告書
受託研究者一同共著
Others, Japanese, 文科省／日本学術振興会
Apr. 2006

半導体全光偏光変換器を用いた40GHzクロックパルス発生
鈴木励; 大平高志; 坂口淳; 上野芳康
Oral presentation, Japanese, 応用物理学会,第53回応用物理学関係連合講演会
Mar. 2006

半導体DISC-Loop型光パルス発生器内部の全光変換透過特性の設計解析 (2)
大平高志; 坂口淳; 鈴木励; 上野芳康
Oral presentation, Japanese, 応用物理学会,第53回応用物理学関係連合講演会
Mar. 2006

New method for characterizing the injected-carrier-to-photon conversion efficiencies inside the ultrafast all-optical semiconductor gates
J. Sakaguchi; Y. Ueno; K. Nishimura; T. Yazaki
Public symposium, English, 9th International Symposium on Contemporary Photonics Technology (CPT 2006), NICT, Tokyo
Jan. 2006

Modeling of the ultrafast optical-3R gate with semiconductor-based interferometric circuit structure
Y. Ueno; M. Toyoda; R. Suzuki
Public symposium, English, International symposium on photonics and advanced networks (ISPAN 2006), Univ. of Electro-Communications, Tokyo
Jan. 2006

Injected-carrier-to-photon conversion efficiencies in semiconductor optical amplifiers
J. Sakaguchi; Y. Ueno; K. Nishimura; T. Yazaki
Public symposium, English, International symposium on photonics and advanced networks (ISPAN 2006), Univ. of Electro-Communications, Tokyo
Jan. 2006

40-GHz mode-locked clock pulse source with SOA-based all-optical polarization converter
R. Suzuki; T. Ohira; J. Sakaguchi; Y. Ueno
Public symposium, English, International symposium on photonics and advanced networks (ISPAN 2006), Univ. of Electro-Communications, Tokyo
Jan. 2006

Optical signal processing research in UEC
N. Kishi; Y. Ueno
Public symposium, English, International symposium on photonics and advanced networks (ISPAN 2006), Univ. of Electro-Communications, Tokyo
Jan. 2006

高速半導体全光ゲートを応用した新しいモードロック光パルス発生方式
上野芳康; 鈴木励; 大平高志; 坂口淳
Public symposium, Japanese, 東京農工大学・電気通信大学21世紀大学COEプログラム第２回合同シンポジウム, 東京農工大学・電気通信大学共催, 東京
Dec. 2005

DISC型全光偏光変換器を利用した40GHz, 5psモードロックパルス発生
鈴木励; 大平高志; 坂口淳; 上野芳康
Public symposium, Japanese, 東京農工大学・電気通信大学21世紀大学COEプログラム第２回合同シンポジウム, 東京農工大学・電気通信大学共催, 東京
Dec. 2005

超高速全光半導体ゲート内部の注入キャリア-光子変換効率の新しい評価方法
坂口淳; 上野芳康; 西村公佐; 矢崎智基
Public symposium, Japanese, 東京農工大学・電気通信大学21世紀大学COEプログラム第２回合同シンポジウム, 東京農工大学・電気通信大学共催, 東京
Dec. 2005

半導体DISC-Loop型高周波パルス発生器に利用する高速偏光変換器のパルス透過率
大平高志; 坂口淳; 鈴木励; 上野芳康
Oral presentation, Japanese, 応用物理学会,第66回応用物理学会学術講演会
Sep. 2005

超高速全光ゲートに利用する半導体光増幅器の注入キャリア利用効率評価方法の提案
坂口淳; 大平高志; 西村公佐; 矢崎智基; 上野芳康
Oral presentation, Japanese, 応用物理学会,第66回応用物理学会学術講演会
Sep. 2005

Theoretical models of the SOA-based SMZ-type optical-3R gates (invited)
Yoshiyasu Ueno; Masashi Toyoda; Rei Suzuki
Invited oral presentation, English, Optical Amplifiers and their Applications (OAA 2005), Optical Society of America (OSA), Budapest, Hungary, International conference
Aug. 2005

Ultrahigh-frequency mode-locked pulse generation with an all-optical semiconductor gate
Y. Ueno; R. Suzuki; J. Sakaguchi
Public symposium, English, International symposium on coherent optical science, Univ. of Electro-Communications, Chofu, Japan
Jul. 2005

トータル光通信技術の研究開発、平成16年度委託研究成果報告書
受託研究者一同共著
Others, Japanese, 郵政省／独立行政法人情報通信研究機構／財団法人テレコム先端技術研究支援センター(SCAT)
Apr. 2005

SMZ型光3Rゲートの光強度雑音抑制力とジッター抑制力の理論設計（招待講演）
上野芳康; 豊田將志; 鈴木励
Invited oral presentation, Japanese, 電子情報通信学会総合大会, 電子情報通信学会
Mar. 2005

超高速PDSMZ型半導体光3Rゲートが備える光雑音抑制力の入力信号タイミング耐性
豊田将志; 上野芳康
Oral presentation, Japanese, 応用物理学会,第52回応用物理学関係連合講演会
Mar. 2005

DISC-Loop型パルス発生器のパルス発生閾値条件
鈴木励; 小林聡; 坂口淳; 大平高志; 上野芳康
Oral presentation, Japanese, 応用物理学会,第52回応用物理学関係連合講演会
Mar. 2005

DISC型全光波長変換器から発生する微小サブパルスの検出
坂口淳; M.L. Nielsen; 大平高志; 鈴木励; 上野芳康
Oral presentation, Japanese, 応用物理学会,第52回応用物理学関係連合講演会
Mar. 2005

Outlook in 10-20 years (invited)
Y. Ueno; G. Theophilopoulos; S.A. Hamilton
Invited oral presentation, English, Optical Fiber Communication Conference (OFC 2005), OFC workshop 'All-optical wavelength conversion and signal processing for next generation network', Optical Society of America (OSA), Los Angeles, USA, International conference
Mar. 2005

全光ゲートを応用した高周波光パルス発生器
上野芳康
Public symposium, Japanese, 東京農工大学・電気通信大学21世紀大学COEプログラム合同シンポジウム, 東京農工大学・電気通信大学共催, 東京
Dec. 2004

超高速40Gb/s光3Rゲートの光強度雑音抑制作用
豊田将志; 鈴木励; 上野芳康
Oral presentation, Japanese, 電子情報通信学会,フォトニックネットワーク研究会
Oct. 2004

PDSMZ型半導体光3Rゲートの光強度雑音抑制力の理論設計
豊田将志; 鈴木励; 上野芳康
Oral presentation, Japanese, 応用物理学会,第65回応用物理学会学術講演会
Sep. 2004

トータル光通信技術の研究開発、平成15年度委託研究成果報告書
受託研究者一同共著
Others, Japanese, 郵政省／独立行政法人情報通信研究機構／財団法人テレコム先端技術研究支援センター(SCAT)
Apr. 2004

PDSMZ型光3Rゲート性能の理論解析
豊田将志; 鈴木励; 永末洋平; 上野芳康
Oral presentation, Japanese, 応用物理学会,第51回応用物理学関係連合講演会
Mar. 2004

SMZ型 光3Rゲートのランダムジッタ抑制作用と出力波長チャープ特性
鈴木励; 永末洋平; 豊田將志; 上野芳康
Oral presentation, Japanese, 応用物理学会,第51回応用物理学関係連合講演会
Mar. 2004

全光ゲートを応用した高周波光パルス発生器
上野芳康
Public symposium, Japanese, 電気通信大学21世紀COEプログラム第1回公開シンポジウム, 電気通信大学, 東京
Dec. 2003

All-optical signal processing for over-100-Gb/s optical TDM networks (Invited)
Yoshiyasu Ueno
Invited oral presentation, English, IEEE LEOS Annual Meeting (LEOS 2003), IEEE/LEOS, Tucson, USA, International conference
Oct. 2003

半導体光アンプを利用する超高速光3Rゲート性能の理論解析
上野芳康
Oral presentation, Japanese, 応用物理学会,第64回応用物理学会学術講演会
Aug. 2003

DISC型超高速波長変換器内部の光位相シフト非対称性の理論予測
上野芳康
Oral presentation, Japanese, 応用物理学会,第64回応用物理学会学術講演会
Aug. 2003

Theoretical reproduction of the 3R regenerative properties in an ultrafast all-optical symmetric-Mach-Zehnder gate
Y. Ueno
Public symposium, English, 10th Int. Workshop on Femtosecond Technology (FST 2003), Femtosecond Technology Association (FESTA), Makuhari, Chiba, Japan
Jul. 2003

Ultrafast optical demultiplexing, regeneration, and wavelength conversion with symmetric-Mach-Zehnder all-optical switches (Invited paper)
S. Nakamura; T. Tamanuki; Y. Ueno; K. Tajima
Invited oral presentation, English, Optical Fiber Communication Conference (OFC 2003), Optical Society of America (OSA), Atlanta, USA, International conference
Mar. 2003

Ultrafast optical signal processing with symmetric-Mach-Zehnder-type all-optical switches
S. Nakamura; T. Tamanuki; M. Takahashi; Y. Ueno; K. Tajima
Invited oral presentation, English, Photonics West, SPIE, San Jose, USA, International conference
2003

Semiconductor integrated Mach-Zehnder all-optical switches and ultrafast all-optical signal processing
K. Tajima; S. Nakamura; M. Takahashi; T. Tamanuki; Y. Ueno; A. Furukawa; T. Sasaki
Invited oral presentation, English, European Conference on Integrated Optics (ECIO 2003), European Optical Society (EOS), Prague, Czech Republic, International conference
2003

Ultrafast SOA-based SMZ-type all-optical regenerators and wavelength converters (Invited)
Yoshiyasu Ueno; Shigeru Nakamura; Kazuhito Tajima
Invited oral presentation, English, Int. Conf. on Solid State Devices & Materials (SSDM 2002), Japan Society of Applied Physics (JSAP), Nagoya, Japan, International conference
Sep. 2002

SMZ型超高速半導体全光スイッチの干渉位相バイアス制御方式の提案と実証
上野芳康; 高橋森生; 中村滋; 鈴木耕一; 清水隆徳; 古川昭雄; 玉貫岳正; 森一男; 阿江敬; 佐々木達也; 田島一人
Oral presentation, Japanese, 応用物理学会,第63回応用物理学会学術講演会
Sep. 2002

半導体光アンプの非線形位相シフト測定法の提案と40-160GHz超高周波特性解析
上野芳康; 中村滋; 田島一人
Oral presentation, Japanese, 応用物理学会,第63回応用物理学会学術講演会
Sep. 2002

対称マッハツェンダ型全光スイッチの位相バイアス制御方式
高橋森生; 上野芳康; 中村滋; 鈴木耕一; 清水隆徳; 古川昭雄; 玉貫岳正; 森一男; 阿江敬; 佐々木達也; 田島一人
Oral presentation, Japanese, 電子情報通信学会,電子情報通信学会ソサイエティ大会
Sep. 2002

Ultrahigh-speed optical processing with SOA-based Symmetric-Mach-Zehnder-type all-optical switches (Invited)
S. Nakamura; Y. Ueno; K. Tajima
Invited oral presentation, English, IEEE/LEOS Summer Topical Meetings, IEEE/LEOS, Quebec, Canada, International conference
Jul. 2002

336-Gbps error-free demultiplexing with a hybrid-integrated Symmetric Mach-Zehnder all-optical switch
S. Nakamura; Y. Ueno; K. Tajima
Public symposium, English, 9th Int. Workshop on Femtosecond Technology (FST 2002), Femtosecond Technology Association (FESTA), Tsukuba, Japan
Jun. 2002

対称マッハ・ツェンダ全光スイッチによる超高速信号処理(招待講演)
中村滋; 上野芳康; 田島一人
Invited oral presentation, Japanese, 電子情報通信学会総合大会, 電子情報通信学会
Mar. 2002

位相調整機能付SMZ全光スイッチの開発
鈴木耕一; 清水隆徳; 高橋森生; 上野芳康; 中村滋; 玉貫岳正; 古川昭雄; 田島一人
Oral presentation, Japanese, 電子情報通信学会,電子情報通信学会総合大会
Mar. 2002

対称マッハツェンダー型全光スイッチと超高速光信号処理
田島一人; 中村滋; 上野芳康
Oral presentation, Japanese, 電子情報通信学会,2001年度第4回集積光デバイス研究会
Dec. 2001

超高速半導体全光スイッチ
上野芳康
Invited oral presentation, Japanese, 平成13年度第4回OEIC・光インターコネクション技術懇談会, (財)光産業技術振興協会
Oct. 2001

Ultrahigh-speed data regeneration and wavelength conversion for OTDM systems (Invited)
Yoshiyasu Ueno; Shigeru Nakamura; Kazuhito Tajima
Invited oral presentation, English, 27th European Conference on Optical Communication (ECOC 2001), European Optical Society (EOS), Amsterdam, The Netherlands, International conference
Sep. 2001

SMZ-DISC型全光波長変換器を内包する光パルス発生器の 5-ps 10-GHzパルス発生
上野芳康; 中村滋; 田島一人
Oral presentation, Japanese, 応用物理学会,第62回応用物理学会学術講演会
Sep. 2001

Error-free demultiplexing at 252 Gbps with hybrid-integrated symmetric Mach-Zehnder all-optical switch
S. Nakamura; Y. Ueno; J. Sasaki; K. Tajima
Public symposium, English, 8th international workshop on Femtosecond Technology (FST 2001), Femtosecond Technology Association (FESTA), Tsukuba, Japan
Jun. 2001

Ultrafast wavelength conversion and data pulse regeneration with Symmetric-Mach-Zehnder all-optical switches
Y. Ueno; S. Nakamura; K. Tajima
Public symposium, English, 8th international workshop on Femtosecond Technology (FST 2001), Femtosecond Technology Association (FESTA), Tsukuba, Japan
Jun. 2001

対称マッハツェンダー型全光スイッチの84Gb/s信号再生動 作
上野芳康; 中村滋; 田島一人
Oral presentation, Japanese, 応用物理学会,第48回応用物理学関係連合講演会
Mar. 2001

Ultrafast Demultiplexing and Bit-Wise Logic Operation using Symmetric Mach-Zehnder All-optical Switches (Invited)
K. Tajima; S. Nakamura; Y. Ueno
Invited oral presentation, English, Int. Conf. on Solid State Devices & Materials (SSDM 2000), Japanese Society of Applied Physics, Japan, International conference
Aug. 2000

Ultrafast demultiplexing and bit-wise digital operation with Symmetric Mach-Zehnder all-optical switch (Invited)
K. Tajima; S. Nakamura; Y. Ueno
Invited oral presentation, English, 5th Optoelectronics and Communications Conference (OECC 2000), IEICE, Makuhari, Chiba, Japan, International conference
Jul. 2000

Ultra-high-speed all-optical switching using semiconductor optical amplifiers (Invited)
S. Nakamura; Y. Ueno; K. Tajima
Invited oral presentation, English, Optical Amplifiers and Their Applications (OAA 2000), Optical Society of America (OSA), Quebec, Canada, International conference
Jul. 2000

168-Gb/s 1.5-ps logic operation of an all-optical SMZ-type switch
Y. Ueno; S. Nakamura; H. Hatakeyama; T. Tamanuki; T. Sasaki; K. Tajima
Public symposium, English, 7th International Workshop on Femtosecond Technology (FST 2000), Femtosecond Technology Association (FESTA), Tsukuba, Japan
Jun. 2000

Error-free 168-Gbps demultiplexing with a hybrid-integrated Symmetric Mach-Zehnder all-optical switch
S. Nakamura; Y. Ueno; K. Tajima
Public symposium, English, 7th International Workshop on Femtosecond Technology (FST 2000), Femtosecond Technology Association (FESTA), Tsukuba, Japan
Jun. 2000

対称マッハツェンダー型全光スイッチの168-GHz 1.5-ps 1-fJ周期スイッチ動作
上野芳康; 中村滋; 田島一人
Oral presentation, Japanese, 応用物理学会,第47回応用物理学関係連合講演会
Mar. 2000

超高速全光半導体波長変換器のスペクトル位相同期特性
上野芳康; 中村滋; 田島一人
Oral presentation, Japanese, 応用物理学会,第60回応用物理学会学術講演会
Sep. 1999

光パケット圧縮伸張技術を用いた通信ノード方式の検討(3) ?パケット伸張装置-
上野芳康; 洲崎哲行; 四方誠; 田島一人; 中村滋
Oral presentation, Japanese, 電子情報通信学会,電子情報通信学会通信ソサイエティ大会講演会
Sep. 1999

Symmetric-Mach-Zehnder all-optical semiconductor switch operation at 42-GHz repetition rate above the carrier's cutoff frequency
Y. Ueno; S. Nakamura; K. Tajima
Public symposium, English, 6th International Workshop on Femtosecond Technology (FST '99), Femtosecond Technology Association (FESTA), Makuhari, Chiba, Japan
Jul. 1999

Femtosecond switching with semiconductor optical amplifier-based symmetric Mach-Zehnder all-optical switch
S. Nakamura; Y. Ueno; K. Tajima
Public symposium, English, 6th International Workshop on Femtosecond Technology (FST '99), Femtosecond Technology Association (FESTA), Makuhari, Chiba, Japan
Jul. 1999

Photonically integrated ultrafast symmetric Mach-Zehnder all-optical switch using planer lightwave circuit technology
K. Tajima; S. Nakamura; Y. Ueno; J. Sasaki; T. Sugimoto; T. Kato; T. Shimoda; H. Hatakeyama; T. Tamanuki; T. Sasaki
Public symposium, English, 6th International Workshop on Femtosecond Technology (FST '99), Femtosecond Technology Association (FESTA), Makuhari, Chiba, Japan
Jul. 1999

対称マッハツェンダー型全光スイッチの繰返し周波数限界の克服と42-GHz動作の実証
上野芳康; 中村滋; 田島一人
Oral presentation, Japanese, 応用物理学会,第46回応用物理学関係連合講演会予稿集
Mar. 1999

高屈折率膜端面コーティングによる短波長半導体レーザの高出力化の提案
上野芳康
Oral presentation, Japanese, 応用物理学会,第46回応用物理学関係連合講演会
Mar. 1999

遅延干渉型波長変換器(DISC)の12-fJ・18-GHz繰返し動作
上野芳康; 中村滋; 田島一人
Oral presentation, Japanese, 応用物理学会,第45回応用物理学関係連合講演会
Mar. 1998

Ultrafast (200 fs) and high-repetition (10 GHz) operations of symmetric Mach-Zehnder all-optical switch
S. Nakamura; Y. Ueno; K. Tajima
Public symposium, English, 5th International Workshop on Femtosecond Technology (FST '98), Femtosecond Technology Association (FESTA), Tsukuba, Japan
1998

Ultrafast all-optical devices with switching speed unrestricted by highly efficient but slow incoherent nonlinearities
K. Tajima; S. Nakamura; Y. Ueno
Public symposium, English, International Symposium on Nonlinear Theory and its Applications, Hawaii, USA
Nov. 1997

遅延干渉型波長変換器の2.8THz波長変換の実証
上野芳康; 中村滋; 田島一人; 北村昌太郎
Oral presentation, Japanese, 応用物理学会,第58回応用物理学会学術講演会
Oct. 1997

chi(2)カスケード型非線形効果によるウォークオフ時の位相シフト
上野芳康; George I. Stegeman; 田島一人
Oral presentation, Japanese, 応用物理学会,第44回応用物理学関係連合講演会
Mar. 1997

スペクトルホールバーニング解消に伴うバンドフィリング屈折率変化の増大
上野芳康; 中村滋; 田島一人; 石川信
Oral presentation, Japanese, 応用物理学会,第44回応用物理学関係連合講演会
Mar. 1997

Femtosecond switching capability of symmetric Mach-Zehnder all-optical switch
S. Nakamura; Y. Ueno; K. Tajima
Public symposium, English, 4th Int. Workshop on Femtosecond Technology (FST '97), Femtosecond Technology Association (FESTA), Tsukuba, Japan
Feb. 1997

Effect of spectral hole burning on symmetric Mach-Zehnder all-optical switch
Y. Ueno; S. Nakamura; K. Tajima; S. Ishikawa
Public symposium, English, 4th Int. Workshop on Femtosecond Technology (FST '97), Femtosecond Technology Association (FESTA), Tsukuba, Japan
Feb. 1997

1.5um波長帯におけるGaInP自然超格子の2次非線形光学テンソルと位相整合
上野芳康; Vincent Ricci; George I. Stegeman
Oral presentation, Japanese, 応用物理学会,第57回応用物理学会学術講演会
Sep. 1996

Low-noise high-power 680-nm AlGaInP laser with sub-GHz frequency response (Best Paper Awarded)
Y. Ueno; H. Sawano; S. Kawata; K. Hara; K. Tada; H. Hotta; K. Endo; K. Kobayashi
Public symposium, English, Symposium on Optical Memory 1994, Japan Society of Applied Physics, Tokyo
Jul. 1994

歪GaInPの光学遷移振動子強度の増大
上野芳康
Oral presentation, Japanese, 応用物理学会,第40回応用物理学関係連合講演会
Mar. 1993

歪MQW高出力可視光半導体レーザ
上野芳康; 藤井宏明; 沢野博之; 遠藤健司
Oral presentation, Japanese, 応用物理学会,第39回応用物理学関係連合講演会
Mar. 1992

High-power visible laser diodes (Invited)
T. Suzuki; Y. Ueno; H. Fujii; K. Kobayashi; K. Endo
Invited oral presentation, English, Conference on Lasers and Electro-Optics (CLEO '91), Optical Society of America, Baltimore, USA, International conference
May 1991

高出力ウィンドウ構造AlGaInP可視光半導体レーザ(II)： CW発振特性
上野芳康; 遠藤健司; 藤井宏明; 小林健一; 原匡宏; 湯浅図南雄
Oral presentation, Japanese, 応用物理学会,第51回応用物理学会学術講演会
Sep. 1990

自然超格子の無秩序化を用いたウィンドウ構造高出力可視光AlGaInPレーザ
上野芳康; 小林健一; 藤井宏明; 五明明子; 遠藤健司; 原国宏; 河田誠治; 湯浅図南雄
Oral presentation, Japanese, 応用物理学会,第37回応用物理学関係連合講演会
Mar. 1990

red-HgI2における共鳴ラマン散乱の偏光解消
上野芳康; 桑田真; 長澤信方
Oral presentation, Japanese, 日本物理学会,第42回物理学会年会
Mar. 1987

偏光変調分光法によるred-HgI2のラマンとルミネッセンス
上野芳康; 桑田真; 長澤信方
Oral presentation, Japanese, 日本物理学会,物理学会1986年秋の分科会
Sep. 1986

red-HgI2における共鳴ラマン散乱
上野芳康; 桑田真; 長澤信方
Oral presentation, Japanese, 日本物理学会,第41回物理学会年会
Mar. 1986

Institute of Electronics, Information, and Communication Engineers (IEICE)

Japan Society of Applied Physics (JSAP)

IEEE, Photonics Society

Japan Society of Applied Physics

IEEE/LEOS

Optical Society of America (OSA)

半導体レーザの極限変調特性実現のための研究開発
浜本貴一教授
Apr. 2022 - Mar. 2024

極限性能半導体レーザの研究開発
浜本貴一教授
Apr. 2019 - Mar. 2021

サブテラヘルツ周波数の光論理ゲートの基礎研究
2003 - 2005

Method and system for all-optical signal regeneration
Patent right, Yoshiyasu Ueno, 060324, Date applied: 01 Feb. 2002, NEC Corporation, US Pat 7,010,235, Date issued: 07 Mar. 2006

半導体レーザ
Patent right, 上野芳康, 千田浩明, -, 3,522,107, Date issued: 20 Feb. 2004

波長変換器及び波長変換方法
Patent right, 上野芳康, -, 3,439,345, Date issued: 13 Jun. 2003

全光スイッチ及び波長変換器
Patent right, 上野芳康, -, 3,391,267, Date issued: 24 Jan. 2003

Wavelength converter
Patent right, Yoshiyasu Ueno, Kazuhito Tajima, -, US Pat 6,498,675, Date issued: 24 Dec. 2002

光パルス発生装置及びそれを用いた光クロック抽出装置と光クロック分周装置と光クロック抽出分周装置
Patent right, 上野芳康, -, 3,314,772, Date issued: 07 Jun. 2002

All-optical switch and wavelength converter
Patent right, Yoshiyasu Ueno, -, Date applied: 14 Jul. 1998, Date announced: 08 Jan. 2002, US Pat 6,337,762, Date issued: 08 Jan. 2002

Optical pulse generating apparatus and optical signal apparatus using the same
Patent right, Yoshiyasu Ueno, US Pat Appl 20010053008, Date applied: 27 Feb. 2001, US Pat Appl 20010053008, Date announced: 20 Dec. 2001

Wavelength converter and wavelength conversion method
Patent right, Yoshiyasu Ueno, -, Date applied: 29 Jun. 1998, US Pat 6,323,992,US Pat 6,323,992, Date announced: 27 Nov. 2001, US Pat 6,323,992,US Pat 6,323,992, Date issued: 27 Nov. 2001

Wavelength converter
Patent right, Yoshiyasu Ueno, US Pat Appl 20010019447,US Pat Appl 20010019447, Date applied: 06 Sep. 2001, US Pat Appl 20010019447,US Pat Appl 20010019447, Date announced: 06 Sep. 2001

Semiconductor laser and method of manufacturing same
Patent right, Yoshiyasu Ueno, Hiroaki Chida, -, Date applied: 12 May 1998, US Pat 6,285,700,US Pat 6,285,700, Date announced: 04 Sep. 2001, US Pat 6,285,700,US Pat 6,285,700, Date issued: 04 Sep. 2001

Wavelength Converter
Patent right, Yoshiyasu Ueno, Kazuhito Tajima, -, Date applied: 28 Apr. 1997, US Pat 6,282,015,US Pat 6,282,015, Date announced: 28 Aug. 2001, US Pat 6,282,015,US Pat 6,282,015, Date issued: 28 Aug. 2001

Wavelength converter
Patent right, -, Date applied: 23 May 1997, US Pat 6,208,455,US Pat 6,208,455, Date announced: 27 Mar. 2001, US Pat 6,208,455,US Pat 6,208,455, Date issued: 27 Mar. 2001

光スイッチ
Patent right, 上野芳康, -, 3,075,199, Date issued: 09 Jun. 2000

半導体光アンプ
Patent right, 藤井宏明, 上野芳康, -, 2,995,972, Date issued: 29 Oct. 1999

半導体レーザ及び半導体レーザの製造方法
Patent right, 沢野博之, 小林健一, 上野芳康, -, 2,990,009, Date issued: 08 Oct. 1999

半導体レーザ
Patent right, 上野芳康, -, 2,932,709, Date issued: 28 May 1999

Semiconductor laser
Patent right, H. Sawano, Y. Ueno, -, US Pat 5,894,491,US Pat 5,894,491, Date announced: 13 Apr. 1999, US Pat 5,894,491,US Pat 5,894,491, Date issued: 13 Apr. 1999

面発光半導体レーザ及びその製造方法
Patent right, 上野芳康, -, 2,880,788, Date issued: 29 Jan. 1999

波長変換器
Patent right, 上野芳康, 田島一人, 中村滋, -, 2,868,084, Date issued: 25 Dec. 1998

半導体レーザおよびその製造方法
Patent right, 上野芳康, -, 2,841,535, Date issued: 23 Oct. 1998

Semiconductor optical switch and wavelength converter
Patent right, Yoshiyasu Ueno, -, Date applied: 17 Apr. 1996, US Pat 5,815,628,US Pat 5,815,628, Date announced: 29 Sep. 1998, US Pat 5,815,628,US Pat 5,815,628, Date issued: 29 Sep. 1998

半導体レーザ
Patent right, 上野芳康, -, 2,817,174, Date issued: 21 Aug. 1998

半導体レーザ
Patent right, 上野芳康, 沢野博之, 富田章久, -, 2,814,943, Date issued: 14 Aug. 1998

半導体レーザ
Patent right, 沢野博之, 上野芳康, -, 2,757,913, Date issued: 13 Mar. 1998

半導体レーザ
Patent right, 上野芳康, 藤井宏明, 五明明子, -, 2,674,381, Date issued: 18 Jul. 1997

半導体レーザ
Patent right, 上野芳康, 藤井宏明, 五明明子, -, 2,674,382, Date issued: 18 Jul. 1997

半導体レーザ
Patent right, 上野芳康, 松本卓, -, 2,581,429, Date issued: 21 Nov. 1996

半導体レーザ
Patent right, 上野芳康, -, 2,546,127, Date issued: 08 Aug. 1996

半導体レーザの製造方法
Patent right, 上野芳康, -, 特公平08-034335, Date issued: 29 Mar. 1996

Semiconductor laser
Patent right, Yoshiyasu Ueno, -, US Pat 5,448,584,US Pat 5,448,584, Date announced: 05 Sep. 1995, US Pat 5,448,584,US Pat 5,448,584, Date issued: 05 Sep. 1995

Semiconductor laser
Patent right, Y. Ueno, H. Fujii, A. Gomyo, -, EU Pat 0,528,439,EU Pat 0,528,439, Date announced: 25 Jan. 1995, EU Pat 0,528,439,EU Pat 0,528,439, Date issued: 25 Jan. 1995

Semiconductor laser
Patent right, Y. Ueno, H. Fujii, A. Gomyo, -, US Pat 5,309,466,US Pat 5,309,466, Date announced: 03 May 1994, US Pat 5,309,466,US Pat 5,309,466, Date issued: 03 May 1994

Semiconductor laser
Patent right, Y. Ueno, -, US Pat 5,151,913,US Pat 5,151,913, Date announced: 29 Sep. 1992, US Pat 5,151,913,US Pat 5,151,913, Date issued: 29 Sep. 1992