TODA Hiroyuki

J-GLOBAL         Last updated: Nov 11, 2019 at 20:13
 
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Name
TODA Hiroyuki
Affiliation
Doshisha University
Section
Faculty of Science and Engineering Department of Electronics
Job title
Professor
Degree
Doctor of Engineering(Osaka University), Master of Engineering(Osaka University)

Research Areas

 
 

Academic & Professional Experience

 
2005
 - 
2008
Doshisha University, Associate Professor
 
2008
   
 
- Doshisha University, Professor
 
1998
 - 
2005
Osaka University, Assistant Professor
 
1996
 - 
1998
Osaka University, Research Associate
 
1990
 - 
1996
Osaka University, Research Associate
 
1990
 - 
1992
Georgia Institute of Technology, Postdoctoral
 
1988
 - 
1990
Fellowships of the Japan Society for the
 
 
   
 
Fellow
 
 
   
 
Scientists
 
 
   
 
Promotion of Science for Japanese Junior
 

Education

 
1986
 - 
1989
Department of Electronic Engineering, Graduate School of Engineering, Osaka University
 
1984
 - 
1986
Department of Electronic Engineering, Graduate School of Engineering, Osaka University
 
1980
 - 
1984
Department of Electronic Engineering, Faculty of Engineering, Osaka University
 

Published Papers

 
Guo Wei Lu, Guo Wei Lu, Ruben S. Luís, Hiroyuki Toda, Jiabin Cui, Takahide Sakamoto, Hongxiang Wang, Yuefeng Ji, Naokatsu Yamamoto
Optics Express   26 20603-20613   Aug 2018
© 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement To meet the ever-increasing bandwidth demands in the future broadband wireless networks, the millimeter-wave (mm-wave) frequency region is being actively...
Z. Tong, C. Lundström, P. A. Andrekson, C. J. McKinstrie, M. Karlsson, D. J. Blessing, E. Tipsuwannakul, B. J. Puttnam, H. Toda, L. Grüner-Nielsen
Nature Photonics   5(7) 430-436   Jul 2011
In principle, optical phase-sensitive amplifiers are known to be capable of realizing noiseless amplification, as well as improving the signal-to-noise-ratio of optical links by 3 dB compared to conventional, phase-insensitively amplified links. H...
Toshiaki Kuri, Hiroyuki Toda, Juan Jose Vegas Olmos, Juan Jose Vegas Olmos, Ken Ichi Kitayama
Journal of Lightwave Technology   28 2247-2257   Aug 2010
A reconfigurable dense wavelength-division-multiplexed (DWDM) access system for millimeter-waveband radio-over-fiber (RoF) is described. Focuses are on the enabling techniques such as optical-frequency-interleaved DWDM grid assignment, supercontin...
J. J. Vegas Olmos, Toshiaki Kuri, Takahiro Sono, Kazunori Tamura, Hiroyuki Toda, Ken Ichi Kitayama
Journal of Lightwave Technology   26(15) 2506-2512   Nov 2008
In this paper, we propose a dynamic reconfigurable wavelength division multiplexed (WDM) millimeter-waveband radio-over-fiber (RoF) and baseband access network. We also demonstrate dynamic channel allocation capability of millimeter-waveband optic...
J. J. Vegas Olmos, Toshiaki Kuri, Takahiro Sono, Kazunori Tamura, Hiroyuki Toda, Ken Ichi Kitayama
IEEE Photonics Technology Letters   20(13) 1127-1129   Jul 2008
We show a bidirectional optical access network with dynamic channel allocation capability of decimeter-wave band optical radio-over-fiber (RoF) and baseband signals. The network can be configured enabling peer-to-peer connectivity, and is based on...
Toshiaki Kuri, Hiroyuki Toda, Ken Ichi Kitayama
IEEE Photonics Technology Letters   19 2018-2020   Dec 2007
We propose a simple demultiplexer for dense wavelength- division-multiplexed (DWDM) milllimeter-wave-band radio-over-fiber (RoF) systems that uses an optical-frequency-interleaving technique, which consists of only a 2 × N arrayed waveguide gratin...
Yuichi Matsushima, Yuichi Matsushima, Yuichi Matsushima, Hiroyuki Toda, Kazi Sarwar Abedin, Koji Yasukawa, Tomohiro Akiyama, Tadao Nagatsuma, Tazuko Tomioka, Hiroshi Ito, Hiroyuki Sasai, Kazuhisa Haeiwa, Masahiro Tsuchiya, Masashi Hotta
IEICE Transactions on Electronics   E90-C 343-344   Jan 2007
Hiroyuki Toda, Masaki Nara, Masaki Nara, Masayuki Matsumoto, Daniele Alzetta, Daniele Alzetta
IEICE Transactions on Communications   E90-B 3670-3672   Jan 2007
We experimentally demonstrated polarization-mode dispersion (PMD) compensation by distributing polarizers with only 1 degree of freedom (DOF) along the transmission line. The average power penalty was measured to be 0.4 dB by inserting four compen...
Toshiaki Kuri, Hiroyuki Toda, Ken Ichi Kitayama
IEEE Photonics Technology Letters   19(24) 2018-2020   2007
Teppei Nakasyotani, Hiroyuki Toda, Hiroyuki Toda, Toshiaki Kuri, Toshiaki Kuri, Ken Ichi Kitayama, Ken Ichi Kitayama
Journal of Lightwave Technology   24(1) 404-410   Jan 2006
We propose to use a supercontinuum (SC) for a low-phase-noise multiwavelength light source in wavelength-division-multiplexing (WDM) millimeter-waveband (mm-waveband) radio-on-fiber (RoF) systems. We demonstrate the generation of low-phase-noise 6...
DWDM millimeter-wave radio-on-fiber systems
Hiroyuki Toda, Toshiaki Kuri, Ken Ichi Kitayama
International Journal of Microwave and Optical Technology   1(2) 761-766   2006
TODA Hiroyuki, MATSUMOTO Masayuki, ALZETTA Daniele
The Review of Laser Engineering   33(2) 95-99   Feb 2005
In optical fiber transmission systems, polarization mode dispersion (PMD), represents a severe source of degradation as the bit rate increases. In this paper, we review PMD compensation techniques performed in optical domain. We also report our ex...
Compact dual-band antenna base station for simultaneously transmitting microwave and millimeter-wave signals in radio-on-fiber systems
戸田 裕之
IEEE LEOS Newsletter   19(2) 14-15   2005
Hiroyuki Toda, Tsukasa Yamashita, Tsukasa Yamashita, Toshiaki Kuri, Ken Ichi Kitayama
Journal of Lightwave Technology   21(8) 1735-1741   Aug 2003
The frequency-interleaved dense- wavelength-division-multiplexing (DWDM) millimeter-wave (mm-wave) radio-on-fiber is an indispensable technique to improve the optical spectrum efficiency. We propose possible configurations of multiplexing and demu...
Toshiaki Kuri, Hiroyuki Toda, Ken Ichi Kitayama
Journal of Lightwave Technology   21(6) 1510-1517   Jun 2003
Photonic downconversion (PDC) technique for dense wavelength division multiplexing (DWDM) millimeter-wave-band radio-on-fiber (ROF) uplink systems is investigated. The PDC technique is carried out for a lump of all uplink wavelength division multi...
Akira Hasegawa, Hiroyuki Toda, Makoto Shikata, Yukihiro Ozeki, Tetsuyuki Suzaki, Yoshiyasu Ueno, Kazuhito Tajima
Journal of Optical Networking   1 221-236   Jan 2002
Packet multiplexing has been proposed as a practical method in optical time-division multiplexing. One reasonable approach is to use a packet compression-expansion scheme at the node to match the transmission rate between the ultrafast backbone op...
戸田 裕之
OSA Journal of Optical Networking   1(7) 221-236   2002
Maoki Suzuki, Hiroyuki Toda, Anhui H. Liang, Akira Hasegawa
IEEE Photonics Technology Letters   13(11) 1248-1250   Nov 2001
In this letter, we propose a new return-to-zero (RZ) optical receiver to improve the amplitude and phase margins without increasing the intersymbol interference by utilizing Kerr nonlinearity in normal dispersion fiber. We employed this technique ...
Hiroyuki Toda, Fumitoshi Nakada, Maoki Suzuki, Akira Hasegawa
IEEE Photonics Technology Letters   12 708-710   Jun 2000
We propose an optical packet compressor based on a fiber delay loop and demonstrate its feasibility for an all optical inter-local area network (LAN) TDM network. The proposed scheme requires only a few devices for compression operation and only o...
戸田 裕之
IEEE Photonics Technology Letters   12(6) 708-710   2000
A. H. Liang, A. H. Liang, H. Toda, A. Hasegawa
Optics Letters   24 1094-1096   Aug 1999
The four wave mixing (FWM) in dense periodic fibers (DPF) has been determined by generalizing the conventional theory of Hill et al. As compared to conventional dispersion-managed systems and constant-dispersion systems, the FWM in DPF is much les...
A. H. Liang, H. Toda, A. Hasegawa
Optics Letters   24 799-801   Jun 1999
The transmission of a densely dispersion-managed soliton (DDMS) in dense periodic fiber (DPF) was studied using nonlinear Schrodinger equation. Stable high-speed DDMS can be transmitted in an optimal DPF with low soliton interaction. Even in the p...
Hiroyuki Toda, Katsuyuki Mino, Katsuyuki Mino, Yuji Kodama, Akira Hasegawa, Peter A. Andrekson
Journal of Lightwave Technology   17 1027-1031   Jun 1999
This paper performed a 10-Gb/s optical soliton transmission experiment in a sliding frequency recirculating loop and found that the noise in optical pulse source decreased error-free distance. This is because the mean frequency of soliton at the p...
Hiroyuki Toda, Yoshihisa Inada, Yuji Kodama, Akira Hasegawa
IEICE Transactions on Communications   E82-B 1541-1543   Jan 1999
We performed 10 Gbit/s optical soliton transmission experiment over 2,000km with bit error rate of <10-9 in a comb-like dispersion profiled fiber (CDPF) loop of 80 km amplifier spacing which corresponds to 1.8 times of dispersion distance. By redu...
H. Toda, N. Yamaguchi, Y. Kodama, T. Shiozaki, A. Hasegawa
Electronics Letters   34 1246-1247   Jun 1998
Dispersive wave energy included in a soliton pulse generated from a Mach-Zehnder modulator and a singlemode fibre is evaluated. When pulse repetition is 10GHz, the minimum dispersive wave energy is only 0.23% when the pulsewidth is 23ps, and 3% ev...
Akira Hasegawa, Hiroyuki Toda
IEICE Transactions on Communications   E81-B 1681-1685   Jan 1998
By sacrificing approximately ten percent of the transmission speed, ultra-high speed optical time division multiplexed network can be fully operatable by the use of currently available electrical switches. The network utilizes dispersion managed q...
A. H. Liang, H. Toda, A. Hasegawa
Optics Letters   22 1766-1768   Dec 1997
The gain and noise figure can be improved by periodic bending of an erbium-doped fiber. Bending of 5.4 m at the beginning of an erbium-doped fiber results in a reduction of noise figure, a gain increment, and a reduction of forward amplified spont...
Hiroyuki Toda, Yasushi Furukawa, Takashi Kinoshita, Yuji Kodama, Akira Hasegawa, Akira Hasegawa
IEEE Photonics Technology Letters   9 1415-1417   Oct 1997
We discuss the properties of comb-like dispersion profiled fiber (CDPF) for an optical soliton transmission. It is found that the CDPF in which the standard single-mode fiber is placed both at the first and at the end of each section is more suita...
Hiroyuki Toda, Toni Shiozaki, Yasuhiro Maeda, Akira Hasegawa
Journal of Lightwave Technology   15 743-748   May 1997
A proper amount of group delay dispersion of a dispersion compensating fiber or a single mode fiber reduces chirping of the optical pulse generated by an electroabsorption modulator. Evaluation of the amount of dispersive wave (nonsoliton componen...
Hiroyuki Toda, Hiroyuki Yamagishi, Akira Hasegawa
Optics Letters   20 1002-1004   Jan 1995
A 10-GHz optical soliton transmission experiment was performed in a recirculating fiber loop in which the carrier frequency was slowly shifted by an acousto-optic modulator with respect to an optical bandpass filter to simulate the sliding-frequen...
Hiroyuki Toda, Hiroyuki Toda, Carl M. Verber
Optics Letters   17 1379-1381   Oct 1992
We report a simple technique to determine whether the nonlinear mechanism that dominates the results of a z-scan n2measurement is slower than the duration of the exciting pulse. In this technique, the temporal waveform of the beam transmitted thro...
Hiroyuki Toda, Masamitsu Haruna, Hiroshi Nishihara
Journal of Lightwave Technology   9 683-687   Jan 1991
An integrated-optic heterodyne interferometer is proposed and demonstrated for displacement measurement with an accuracy of several nanometers. All guided-wave components required for displacement measurement, including a serrodyne phase modulator...
Hiroyuki Toda, Kenichi Kasazumi, Masamitsu Haruna, Hiroshi Nishihara
Journal of Lightwave Technology   7 364-367   Jan 1989
We propose and demonstrate a novel LiNbO3 optical integrated circuit (optical IC) pigtailed with two single-mode fibers, which allows time-division two-dimensional (2-D) velocity measurement. To detect time-division multiplexed beat signals corres...
Hiroyuki Toda, Masamitsu Haruna, Hiroshi Nishihara
Electronics and Communications in Japan (Part II: Electronics)   71 96-108   Jan 1988
This paper describes an optical integrated circuit (optical IC) for a laser Doppler velocimeter (LDV) in which a polarization‐maintaining optical fiber is used to pick up a signal light. To realize more compact and stable heterodyne optics for vel...
Hiroyuki Toda, Masamitsu Haruna, Hiroshi Nishihara
Journal of Lightwave Technology   5 901-905   Jan 1987
In this paper, we propose and demonstrate a new optical integrated circuit (optical IC) pigtailed with a polarization-maintain-ing fiber for the laser Doppler velocimeter. In this optical IC, a waveguide frequency shifter, a TE/TM mode converter, ...
Masamitsu Haruna, S. Yoshida, H. Toda, H. Nishihara
Applied Optics   26 4587-4592   Jan 1987
A computer-controlled laser-beam writing system has been developed for optical integrated circuits (optical ICs). This system allows us to make waveguidepatterns 'formula presented' wide, such as directional couplers, and Yjunction, crossed, and S...
H. Toda, M. Haruna, H. Nishihara
Electronics Letters   22 982-984   Jan 1986
We first demonstrate an integrated-optic device for a fibre laser Doppler velocimeter, which consists of a waveguide interferometer and a frequency shifter in z-propagation Ti-diffused LiNbO3. The device is also pigtailed with a single-mode fibre ...

Misc

 
Output power enhancement in photonic-based RF generation by optical pulse compression with a dispersion managed fiber: toward 300 GHz generation and simplified compression fiber
K. Oda, K. Kudomi, R. Katagiri, M. Suzuki, and H. Toda
Asia Communications and Photonics Conference (ACP 2019)   T1E.2   Nov 2019   [Refereed]
Output power enhancement in photonic-based RF generation by optical pulse compression with a dispersion managed fiber - simplified compression fiber -
K. Oda, K. Kudomi, R. Katagiri, M. Suzuki, and H. Toda
3rd PEM International Workshop (PEM2019)   PE-01   Nov 2019
分散マネージメントファイバによる光パルス圧縮を用いた 300 GHz ビート出力の増大
久富浩平、小田圭佑、片桐亮吾、鈴木将之、戸田裕之
Proceedings of the Society Conference of IEICE   C-14-14   Sep 2019
分散マネージメントファイバによる光パルス圧縮を用いたビート出力の増大 - 圧縮用光ファイバの簡略化 -
小田圭佑、久富浩平、片桐亮吾、鈴木将之、戸田裕之
Proceedings of the Society Conference of IEICE   C-14-13   Sep 2019
Output power enhancement in photonic-based RF generation by optical pulse compression with a dispersion managed fiber: Toward 300-GHz broadband generation
K. Kudomi, K. Oda, R. Katagiri, M. Suzuki, and H. Toda
2019 URSI-Japan Radio Science Meeting (URSI-JRSM 2019)   D1-5   Sep 2019
分散マネージメントファイバによる光パルス圧縮を用いたビート出力増大に おけるRF利得の周波数特性 −スケール則に基づいた光パワーの設定−
小田圭佑、カレンベラ レインハード、戸田裕之
Proceedings of the IEICE General Conference   C-14-8   Mar 2019
Fundamental study of phase-control-free coherent-beam combining toward femtosecond-pulse amplification in bulk medium
K. Fujio, Y. Miyasaka, H. Toda, and H. Kiriyama
2nd QST International Symposium   P-25   Nov 2018   [Refereed]
Output power enhancement in photonic-based RF generation by optical pulse compression with a dispersion managed highly-nonlinear fiber
R. Karembera, T. Yamaguchi, and H. Toda
International Topical Meeting on Microwave Photonics (MWP 2018)      Oct 2018   [Refereed]
分散マネージメントファイバによる光パルス圧縮を用いたビート出力増大におけるRF周波数の広帯域化
カレンベラ レインハード、山口剛史、戸田裕之
Proceedings of the Society Conference of IEICE   C-14-14   Sep 2018
Output power enhancement in photonic-based RF generation by optical pulse compression with a dispersion managed fiber (invited)
H. Toda
Optoelectronics Global Conference (OGC 2018)   S2-C-1   Sep 2018   [Refereed][Invited]
Output power enhancement in photonic-based RF generation by optical pulse compression with a dispersion managed fiber
R. Karembera, T. Yamaguchi and H. Toda
Progress In Electromagnetics Research Symposium (PIERS 2018)   2P11-16   Aug 2018   [Refereed]
Output power enhancement in photonic-based RF generation by optical pulse compression with fiber (invited)
T. Yamaguchi and H. Toda
Progress In Electromagnetics Research Symposium (PIERS 2018)   2P9a-2   Aug 2018   [Refereed][Invited]
Guo Wei Lu, Guo Wei Lu, Ruben S. Luis, Hiroyuki Toda, Jiabin Cui, Takahide Sakamoto, Hongxiang Wang, Yuefeng Ji, Naokatsu Yamamoto
2018 Conference on Lasers and Electro-Optics, CLEO 2018 - Proceedings   JTh2A   Aug 2018
? 2018 OSA. A 28Gbps PAM4 60GHz radio-over-fiber system is proposed and experimentally demonstrated by injection locking a two-tone light to a directly-modulated laser. Experimental results show negligible power penalty for the obtained PAM4 after...
Output power enhancement in photonic-based RF generation by optical pulse compression with a dispersion managed highly-nonlinear fiber
R. Karembera, T. Yamaguchi, and H. Toda
電子情報通信学会技術研究報告. MWP, マイクロ波・ミリ波フォトニクス = IEICE technical report. MWP, Microwave and millimeter-wave photonics   MWP2018-26   Jul 2018
分散マネージメントファイバによる光パルス圧縮を用いたビート出力の増大
山口剛史、カレンベラ レインハード、戸田裕之
Proceedings of the IEICE General Conference   C-14-2   Mar 2018
Hiroshi Murata, Yui Otagaki, Naruto Yonemoto, Yasuyuki Kakubari, Kensuke Ikeda, Nobuhiko Shibagaki, Hiroyuki Toda, Hiroshi Mano, Usman Habib, Nathan Gomes
2017 IEEE Conference on Antenna Measurements and Applications, CAMA 2017   24-27   Jan 2018   [Refereed]
? 2017 IEEE. Photonic-based millimeter-wave communication systems combined with conventional wireless systems have been proposed for the application in dense user environments like a large football stadium. By utilizing a narrow beam antenna for m...
光ビート法によるサブテラヘルツ波発生における光パルス圧縮を用いた出力の増大
山口剛史、戸田裕之
電子情報通信学会技術研究報告. MWP, マイクロ波・ミリ波フォトニクス = IEICE technical report. MWP, Microwave and millimeter-wave photonics   MWP2017-92   Jan 2018
Photonic-based heterogeneous wireless links for 5G network in dense user environment (invited)
H. Murata, H. Toda, N. Yonemoto, Y. Kakubari, N. Shibagaki, K. Ikeda and H. Mano
SPIE Photonics West 2018   10559-9   Jan 2018   [Refereed][Invited]
Takashi Yamaguchi, Shigenobu Sakakibara, Yui Otagaki, Hiroshi Murata, Hiroyuki Toda
MWP 2017 - 2017 International Topical Meeting on Microwave Photonics   Wep.28   Dec 2017
? 2017 IEEE. In this manuscript, we propose to use optical pulse compression in a dispersion-shifted fiber (DSF) to enhance the output power in photonic-based RF generation. In a 60-GHz RF generation experiment using a DSF, an RF gain due to the o...
光ビート法による高周波発生における光パルス圧縮を用いた出力の増大−光源の線幅と出力の位相雑音−
山口剛史、森本裕喜、Usman Habib、Shabnam Noor、Nathan Gomes、戸田裕之
Proceedings of the IEICE General Conference   C-14-15   Mar 2017
Takashi Yamaguchi, Hiroyuki Toda
Optics InfoBase Conference Papers   M1E.1   Jan 2017
? 2017 OSA. Microwave and millimeter-wave generation based on photonic technology [1-3] is promising for many applications. In this method, the RF output power is limited by the maximum average optical power to the photo detector (PD). Therefore, ...
Toshiyuki Inoue, Kensuke Ikeda, Yasuyuki Kakubari, Naruto Yonemoto, Nobuhiko Shibagaki, Hiroyuki Toda, Hiroshi Murata
2016 IEEE International Topical Meeting on Microwave Photonics, MWP 2016   55-58   Dec 2016
? 2016 IEEE. We have been trying to develop photonic devices and sub-systems for radio-over-fiber based wireless mobile communication in dense-user environments. We report demonstrations of millimeter-wave wireless signal generation using optical ...
Takashi Yamaguchi, Hiroki Morimoto, Hiroyuki Toda
2016 URSI Asia-Pacific Radio Science Conference, URSI AP-RASC 2016   1528-1530   Oct 2016
? 2016 IEEE. Microwave and millimeter-wave generation based on photonic technology is promising for many applications. However, the RF output power is limited by the maximum optical power to the photo detector. In this manuscript we propose to use...
光2トーンを種光とした光ビート法による高周波発生における光パルス圧縮を用いた出力の増大
山口剛史、森本裕喜、戸田裕之
Proceedings of the Society Conference of IEICE   C-14-5   Sep 2016
5G無線通信のためのフォトニック技術を用いたミリ波信号の生成と空間多重信号の分離・検出
井上敏之、村田博司、池田研介、角張泰之、米本成人、戸田裕之
Proceedings of the Society Conference of IEICE   BCS-1-6   Sep 2016
光ビート法による高周波発生における光パルス圧縮を用いた出力の増大
森本裕喜、山口剛史、戸田裕之
Proceedings of the IEICE General Conference   C-14-1   Mar 2016
Yoshiki Onishi, Norimasa Nagatani, Hiroyuki Toda, Tetsuya Kawanishi
2015 International Topical Meeting on Microwave Photonics, MWP 2015 - Conference Proceedings   WeB-3   Dec 2015
? 2015 IEEE. In this paper, we investigate the optical power fluctuation of the output in optical comb generator using an optical single sideband (SSB) modulator with a fiber loop. This fluctuation is caused by undesired sidebands of the SSB modul...
Takashi Yamaguchi, Hiroki Morimoto, Hiroyuki Toda
Asia Communications and Photonics Conference, ACP 2015   AM2G.2   Dec 2015
We examine the influence of the narrow IF BPF on phase noise of spurious suppressed opto-electronic microwave oscillators. We found that the phase noise cancellation is effective only within the bandwidth of the IF BPF. ? 2015 OSA.
高密度ユーザ集中環境下における次世代無線通信のためのフォトニックベースミリ波リンクの基礎検討
村田博司、井上敏之、塩見英久、池田研介、角張泰之、戸田裕之、米本成人、柴垣信彦、眞野 浩
Proceedings of the Society Conference of IEICE   C-14-7   Sep 2015
スプリアス抑圧型光マイクロ波発振器における中間周波数フィルタの狭帯域化に関する検討
山口剛史、森本裕喜、戸田裕之
Proceedings of the Society Conference of IEICE   C-14-11   Sep 2015
Optimization of an optical bandpass filter on a stabilized quadruple OTDM multiplier for RZ/CS-RZ optical clock
P. Buechler, K. Sugiyama, and H. Toda
International Topical Meeting on Microwave Photonics / Asia-Pacific Microwave Photonics Conference (MWP/APMP 2014)   TuEG-11   Oct 2014   [Refereed]
Influence of harmonic distortions of driving signal on the measurement of Mach-Zehnder modulator parameters
Y. Nishi, N. Ichino, T. Hayashi, H. Toda, and T. Kawanishi
International Topical Meeting on Microwave Photonics / Asia-Pacific Microwave Photonics Conference (MWP/APMP 2014)   TuEB-5   Oct 2014   [Refereed]
SSB変調光コム発生器のループ長安定化による光スペクトル変動の抑制
長谷徳将、大西紀貴、戸田裕之、川西哲也
Proceedings of the Society Conference of IEICE   B-10-57   Sep 2014
マッハ-ツェンダー型光強度変調器の基本パラメータ測定における変調器駆動正弦波の高調波歪の影響
林 孝浩、戸田裕之、川西哲也
Proceedings of the IEICE General Conference   C-14-17   Mar 2014
超高感度光リンクへの応用を目指した位相感応型光増幅器
Z. Tong, C. Lundstr_m、P. A. Andrekson、C. J. McKinstrie、M. Karlsson、D. J. Blessing、E. Tipsuwannakul、B. J. Puttnam、戸田裕之、L. Gr_ner-Nielsen
レーザー学会学術講演会第33回年次大会   22aII-3   Jan 2014   [Invited]
Yuji Nishi, Naoya Ichino, Takahiro Hayashi, Hiroyuki Toda, Tetsuya Kawanishi
2014 International Topical Meeting on Microwave Photonics / the 9th Asia-Pacific Microwave Photonics Conference, MWP/APMP 2014 - Proceedings   117-120   Jan 2014
? 2014 IEICE. In this paper, we describe the influence of harmonic distortions of RF driving signal on the measurement of Mach-Zehnder modulator parameters, those are half-wave voltage and intrinsic chirp parameter. The influences on the measured ...
Pierre Buechler, Kiyotaka Sugiyama, Hiroyuki Toda
2014 International Topical Meeting on Microwave Photonics / the 9th Asia-Pacific Microwave Photonics Conference, MWP/APMP 2014 - Proceedings   280-283   Jan 2014
? 2014 IEICE. We are focusing on the study of a phase stabilized quadruple RZ/CS-RZ optical clock multiplier. A flat-top optical bandpass filter (OBPF) is used to filter 3 consecutive optical sidebands from the OTDM multiplexed output. The filtere...
Influence of harmonic distortions of driving signal on chirp parameter measurement of Mach-Zehnder modulator - Experimental Verification -
T. Hayashi, H. Toda, and T. Kawanishi
Asia Communications and Photonics Conference (ACP 2013)   ATh3F.6   Nov 2013   [Refereed]
Influence of slope of flat-top optical bandpass filter on a stabilized quadruple OTDM multiplier for RZ/CS-RZ optical clock
Pierre Buechler、大槻雅人、戸田裕之
第74回応用物理学会秋季学術講演会   18a-A8-5   Sep 2013
Influence of slope of optical bandpass filter on a stabilized quadruple OTDM multiplier for RZ/CS-RZ optical clock
P. Buechler, M. Otsuki, and H. Toda
2013 Asia-Pacific Radio Science Conference (AP-RASC'13)   PII-DC-1   Sep 2013   [Refereed]
マッハ−ツェンダー型光強度変調器のチャープパラメータ測定における変調器駆動正弦波の高調波歪の影響 −実証実験−
林 孝浩、戸田裕之、川西哲也
Proceedings of the Society Conference of IEICE   C-14-4   Sep 2013
Buechler Pierre, OTSUKI Masato, Toda Hiroyuki
Technical report of IEICE. OPE   113(144) 143-146   Jul 2013
Our work focuses on the study of a phase stabilized quadruple RZ/CS-RZ optical clock multiplier. This quadruple OTDM multiplier is composed of two Mach-Zehnder interferometers. In this presentation, we propose to use a flat top OBPF to filter thre...
A phase stabilized quadruple OTDM multiplier for RZ/CS-RZ optical clock with a flat-top optical bandpass filter
P. Buechler, M. Otsuki, and H. Toda
電子情報通信学会技術研究報告. MWP, マイクロ波・ミリ波フォトニクス = IEICE technical report. MWP, Microwave and millimeter-wave photonics   MWP2013-30   Jul 2013
Influence of harmonic distortion of driving signal on chirp parameter measurement of Mach-Zehnder modulator
T. Hayashi, H. Toda, and T. Kawanishi
2013 Asia-Pacific Microwave Photonics Conference (APMP 2013)   WB5   Apr 2013   [Refereed]
マッハ−ツェンダー型光強度変調器のチャープパラメータ測定における変調器駆動正弦波の二次高調波歪の影響
林 孝浩、戸田裕之、川西哲也
Proceedings of the IEICE General Conference   (2) C-14-2   Mar 2013
Takahiro Hayashi, Hiroyuki Toda, Tetsuya Kawanishi
Asia Communications and Photonics Conference, ACP   ATh3F.6   Jan 2013
In this paper, we describe the influence of harmonic distortions of RF driving signal on chirp parameter measurement of a Mach-Zehnder modulator. The influence was experimentally verified for the first time. ? OSA 2013.
NISHIOKA Masaki, CHIKAMOTO Takuya, SHIMIZU Tatsuya, TODA Hiroyuki, INAFUNE Koji, KAGAWA Masatoshi, MURAI Hitoshi
電気学会研究会資料. EMT, 電磁界理論研究会   2012(76) 101-104   Jul 2012
OTSUKI Masato, TAKAMA Renjo, TODA Hiroyuki
Technical report of IEICE. OPE   112(156) 185-189   Jul 2012
We demonstrate a phase stabilized quadruple OTDM multiplier for RZ/CS-RZ optical clock. An optical bandpass filter (OBPF) was used to filter the desired sideband from the multiplier output, and the filtered output was used for the stabilization. I...
NISHIOKA Masaki, CHIKAMOTO Takuya, SHIMIZU Tatsuya, TODA Hiroyuki, INAFUNE Koji, KAGAWA Masatoshi, MURAI Hitoshi
Technical report of IEICE. OPE   112(156) 101-104   Jul 2012
We demonstrate a stabilization of 40Gbit/s optical DQPSK demodulator using a wavelength tunable CW laser. The BER of the received data was stabilized.
OTSUKI Masato, TAKAMA Renjo, TODA Hiroyuki
電子情報通信学会技術研究報告. MWP, マイクロ波・ミリ波フォトニクス = IEICE technical report. MWP, Microwave and millimeter-wave photonics   112(158) 185-189   Jul 2012
We demonstrate a phase stabilized quadruple OTDM multiplier for RZ/CS-RZ optical clock. An optical bandpass filter (OBPF) was used to filter the desired sideband from the multiplier output, and the filtered output was used for the stabilization. I...
NISHIOKA Masaki, CHIKAMOTO Takuya, SHIMIZU Tatsuya, TODA Hiroyuki, INAFUNE Koji, KAGAWA Masatoshi, MURAI Hitoshi
電子情報通信学会技術研究報告. MWP, マイクロ波・ミリ波フォトニクス = IEICE technical report. MWP, Microwave and millimeter-wave photonics   112(158) 101-104   Jul 2012
We demonstrate a stabilization of 40Gbit/s optical DQPSK demodulator using a wavelength tunable CW laser. The BER of the received data was stabilized.
Otsuki Masato, Takama Renjo, Toda Hiroyuki
Proceedings of the IEICE General Conference   2012(2)    Mar 2012
Masato Otsuki, Renjo Takama, Hiroyuki Toda
Asia Communications and Photonics Conference, ACP      Jan 2012
We demonstrate a phase stabilized quadruple OTDM multiplier for RZ/CS-RZ optical clock. An optical bandpass filter (OBPF) was used to filter the desired sideband from the multiplier output, and the filtered output was used for the stabilization. 1...
Takuya Chikamoto, Masaki Nishioka, Tatsuya Shimizu, Hiroyuki Toda, Koji Inafune, Masatoshi Kagawa, Hitoshi Murai
Asia Communications and Photonics Conference, ACP      Jan 2012
We demonstrate a stabilization of 40 Gbit/s optical DQPSK receiver using a wavelength tunable CW laser. The BER of the received data was successfully stabilized. © OSA 2012.
Kimihiro Toki, Dai Uesaka, Takahiro Yamazaki, Hiroyuki Iwata, Masahisa Yoshikawa, Hiroyuki Toda, Tetsuya Kawanishi
2011 IEEE International Topical Meeting on Microwave Photonics - Jointly Held with the 2011 Asia-Pacific Microwave Photonics Conference, MWP/APMP 2011   354-356   Dec 2011
We measured frequency responses of half-wave voltage V π and chirp parameter α 0 of LiNbO 3 modulators below 1 GHz range using optical heterodyne scheme with an acousto-optic modulator. The coefficients of variation of the measured values of V π a...
Tatsuya Shimizu, Masafumi Nagao, Takuya Chikamoto, Koji Inafune, Masatoshi Kagawa, Hitoshi Murai, Hiroyuki Toda
IEEE Photonic Society 24th Annual Meeting, PHO 2011   773-774   Dec 2011
We demonstrate stabilization of a delay interferometers (DI) for variable bit-rate DPSK receiver from 40 Gbit/s up to 160 Gbit/s using a wavelength tunable CW laser. The phase difference is continuously tunable by tuning the CW laser. The BER of t...
Hiroyuki Toda, Juan Jose Vegas Olmos, Juan Jose Vegas Olmos, Toshiaki Kuri, Ken Ichi Kitayama
IEEE Photonic Society 24th Annual Meeting, PHO 2011   266-267   Dec 2011
We describe reconfigurable DWDM millimeter-wave band radio-over-fiber (RoF) access system technologies. Focuses are on optical frequency interleaving, supercontinuum multi-wavelength light source and photonic up/down conversion for RoF signals, an...
Chikamoto Takuya, Shimizu Tatsuya, Nagao Masafumi, Toda Hiroyuki, Inafune Koji, Kagawa Masatoshi, Murai Hitoshi
Proceedings of the Society Conference of IEICE   2011(2)    Aug 2011
TOKI Kimihiro, UESAKA Dai, YAMAZAKI Takahiro, IWATA Hiroyuki, YOSHIKAWA Masahisa, TODA Hiroyuki, KAWANISHI Tetsuya
IEICE technical report   111(150) 105-108   Jul 2011
We measured frequency response of half-wave voltage V_π and chirp parameter α_0 of LiNbO_3 modulators below 1 GHz range using optical heterodyne scheme with an acousto-optic modulator. We observed strong dependency of V_π and α_0 on the frequency.
SHIMIZU Tatsuya, NAGAO Masafumi, INAFUNE Koji, KAGAWA Masatoshi, MURAI Hitoshi, TODA Hiroyuki
IEICE technical report   111(92) 33-37   Jun 2011
We demonstrated a 160 Gbit/s RZ/CS-RZ OTDM multiplexer, where optical phase between adjacent channels was stabilized. Optical bandpass filters were used to pick up carrier component of the multiplexer output for the stabilization. The optical spec...
Nagao Masafumi, Shimizu Tatsuya, Chikamoto Takuya, Toda Hiroyuki, Inafune Koji, Kagawa Masatoshi, Murai Hitoshi
Proceedings of the IEICE General Conference   2011(2)    Feb 2011
M. Nagao, T. Shimizu, M. Tanimura, Y. Murata, K. Inafune, M. Kagawa, H. Murai, H. Toda
2010 Asia Communications and Photonics Conference and Exhibition, ACP 2010   431-432   Dec 2010
We demonstrate a 160 Gbit/s RZ/CS-RZ OTDM multiplexer, where optical phase between adjacent channels was stabilized. The use of optical bandpass filter to pick up carrier or sideband component of the multiplexer output eliminates the needs for a t...
Kenji Nitta, Hiroyuki Toda, Toshiaki Kuri, Ken Ichi Kitayama
Proceedings - 2010 IEEE International Topical Meeting on Microwave Photonics, MWP 2010   339-342   Dec 2010
In this paper, we numerically investigate the influence of multi-interchannel optical crosstalk in a 25-GHz spaced dense-wavelength division multiplexing (DWDM) millimeter-wave-band radio-over-fiber (RoF) downlink system. Up to 31 undesired RoF si...
T. Shimizu, Y. Murata, M. Tanimura, M. Nagao, K. Inafune, M. Kagawa, H. Murai, H. Toda
Technical Digest - 15th OptoElectronics and Communications Conference, OECC2010   770-771   Nov 2010
We demonstrated an 80 Gbit/s RZ/CS-RZ OTDM multiplexer, where optical phase between adjacent channels was stabilized. The use of optical bandpass filter to pick up carrier or sideband component of the multiplexer output eliminates the needs for a ...
Nagao Masafumi, Shimizu Tatsuya, Tanimura Masayoshi, Inafune Koji, Kagawa Masatoshi, Murai Hitoshi, Toda Hiroyuki
Proceedings of the Society Conference of IEICE   2010(2)    Aug 2010
SHIMIZU Tatsuya, TANIMURA Masayoshi, NAGAO Masafumi, INAFUNE Koji, KAGAWA Masatoshi, MURAI Hitoshi, TODA Hiroyuki
IEICE technical report   110(156) 57-62   Jul 2010
We demonstrated an 80 Gbit/s RZ/CS-RZ OTDM multiplexer, where optical phase between adjacent channels was stabilized. The use of optical bandpass filter to pick up carrier or sideband component of the multiplexer output, which is used for the stab...
Yamaguchi Takashi, Nitta Kenji, Toda Hiroyuki, Kuri Toshiaki, Kitayama Ken-ichi
Proceedings of the IEICE General Conference   2010(1)    Mar 2010
Iwata Hiroyuki, Yoshikawa Masahisa, Toda Hiroyuki, Kawanishi Tetsuya
Proceedings of the IEICE General Conference   2010(1)    Mar 2010
Murata Yuki, Shimizu Tatsuya, Tanimura Masayoshi, Nagao Masafumi, Inafune Koji, Kagawa Masatoshi, Murai Hitoshi, Toda Hiroyuki
Proceedings of the IEICE General Conference   2010(2)    Mar 2010
Miyashita Junichi, Murata Yuki, Nagao Masafumi, Toda Hiroyuki
Proceedings of the IEICE General Conference      2010
Toshiaki Kuri, Hiroyuki Toda, Juan Jose Vegas Olmos, Juan Jose Vegas Olmos, Ken Ichi Kitayama
MWP09 - 2009 International Topical Meeting on Microwave Photonics      Dec 2009
Dense wavelength division multiplexing network of coexisting analog radio-over-fiber and digital fiber-to-the-home signals is presented, by focusing on enabling techniques including optical frequency interleaving, supercontinuum light source, and ...
Y. Murata, M. Nagao, J. Miyashita, K. Inafune, M. Kagawa, H. Murai, H. Toda
Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS   489-490   Dec 2009
We demonstrated a 160 Gbit/s OTDM multiplexer, where optical phase between adjacent channels was stabilized with a CW laser. The optical spectrum variation was within 0.4 dB with temperature change between 15°C and 35°C. © 2009 IEEE.
Toshiaki Kuri, Juan Jose Vegas Olmos, Juan Jose Vegas Olmos, Hiroyuki Toda, Ken Ichi Kitayama
Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS   677-678   Dec 2009
Dense wavelength division multiplexing network of co-existing analog radio-over-fiber and digital fiber-to-the-home signals is presented, by focusing on enabling techniques including optical frequency interleaving, supercontinuum multi-wavelength ...
Tetsuya Kawanishi, Takahide Sakamoto, Akito Chiba, Hiroyuki Toda, Hiroshi Murata, Akira Enokihara
2009 14th OptoElectronics and Communications Conference, OECC 2009      Nov 2009
We demonstrated ultra low-chirp and high extinction-ratio modulation, by using an integrated lithium niobate modulator. The odd order optical sideband components were highly suppressed to achieve a chirp-free intensity modulated frequency doubled ...
NAGAO Masafumi, MURATA Yuki, MIYASHITA Junichi, INAFUNE Koji, KAGAWA Masatoshi, MURAI Hitoshi, TODA Hiroyuki
IEICE technical report   109(243) 87-91   Oct 2009
Phase difference between adjacent optical pulses is stabilized by means of stabilization of a delay interferometer (DI), which can be considered as an optical time-division multiplexed (OTDM) multiplexer. A continuous wave (CW) tunable laser, wher...
Nagao Masafumi, Murata Yuki, Miyashita Junichi, Inafune Koji, Kagawa Masatoshi, Murai Hitoshi, Toda Hiroyuki
Proceedings of the Society Conference of IEICE   2009(2)    Sep 2009
MURATA Yuki, NAGAO Masafumi, MIYASHITA Junichi, INAFUNE Koji, KAGAWA Masatoshi, MURAI Hitoshi, TODA Hiroyuki
IEICE technical report   109(159) 185-189   Jul 2009
Phase difference between adjacent optical pulses is stabilized by means of stabilization of a delay interferometer (DI), which can be considered as an optical time-division multiplexed (OTDM) multiplexer. A continuous wave (CW) tunable laser, wher...
Toda Hiroyuki, Miyashita Junichi
The science and engineering review of Doshisha University   50(1) 54-58   Apr 2009
遅延干渉計の光路差を制御・安定化することによって、隣接光パルス間の位相を安定化した光時分割多重回路について検討した。安定化には、入力光パルスと波長の異なる連続光の干渉を利用した。ピエゾ素子とロックインアンプを用いてフィードバックをかけ、連続光の波長を変えることによって、8π以上にわたって位相差を制御できることを確認した。さらに、ファイバ型遅延干渉計を2台接続した光クロックの4逓倍回路を作成し、1台の波長可変レーザによる制御で、40GHzの同相および位相反転光クロックを生成した。Phase ...
Takashi Yamaguchi, Yoshitomo Takahashi, Hiroyuki Toda, Toshiaki Kuri, Toshiaki Kuri, Ken Ichi Kitayama
2008 IEEE International Meeting on Microwave Photonics jointly held with the 2008 Asia-Pacific Microwave Photonics Conference, MWP2008/APMP2008   185-188   Dec 2008
In this paper, we experimentally investigate the influence of multi-channel optical crosstalk in a 25-GHz spaced dense-wavelength division multiplexing (DWDM) millimeter-wave-band radio-over-fiber (RoF) downlink system. The eleven-channel crosstal...
Hiroyuki Toda, Junichi Miyashita, Akito Chiba, Takahide Sakamoto, Tetsuya Kawanishi, Masahiro Tsuchiya, Masayuki Izutsu
Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS   421-422   Dec 2008
We demonstrate highly pure 160-GHz two-tone lightwave generation using a high extinction-ratio optical intensity modulator and a delay interferometer. The undesired sideband suppression ratio was more than 39 dB. ©2008 IEEE.
J. J.Vegas Olmos, Toshiaki Kuri, Takahiro Sono, Kazunori Tamura, Hiroyuki Toda, Ken Ichi Kitayama
European Conference on Optical Communication, ECOC      Dec 2008
We propose and demonstrate a fully-interleaved WDM dynamic reconfigurable 155-Mbit/s 60GHz millimeter-wave-band radio-over-fiber (RoF) and 2.5-Gbit/s baseband access network. © 2008 IEEE.
KAWANISHI Tetsuya, SAKAMOTO Takahide, CHIBA Akito, TODA Hiroyuki, ENOKIHARA Akira, MURATA Hiroshi
IEICE technical report   108(259) 53-58   Oct 2008
We investigated precise measurement methods for half-wavelength voltage, chirp paramter, extinction ratio of Mach-Zehnder modulators. Recently, very high extinction ratio over 70dB and ultra low chirp under 0.01 were achieved by using an active tr...
Ken Ichi Kitayama, Toshiaki Kuri, J. J Vegas Olmos, Hiroyuki Toda
2008 Conference on Quantum Electronics and Laser Science Conference on Lasers and Electro-Optics, CLEO/QELS      Sep 2008
Dense WDM access network of co-existing analog radio over fiber and digital FTTH systems is presented, by focusing on enabling techniques including optical frequency interleaving, supercontinuum light source, and optical channel allocation for wir...
Tetsuya Kawanishi, Takahide Sakamoto, Akito Chiba, Masahiro Tsuchiya, Hiroyuki Toda
2008 Conference on Quantum Electronics and Laser Science Conference on Lasers and Electro-Optics, CLEO/QELS      Sep 2008
Pure two-tone signal generation with spurious suppression ratio of 47 dB was demonstrated by using an optical Mach-Zehnder modulator with precisely balanced operation, where extinction ratio and chirp parameter were respectively 64 dB and 0.0099. ...
Toshiaki Kuri, Hiroyuki Toda, Ken Ichi Kitayama
2008 IEEE Radio and Wireless Symposium, RWS   137-140   Sep 2008
Dense wavelength division multiplexed (DWDM) access network which allows to co-exists analog radio-over-fiber (RoF) and digital fiber-to-the-home (FTTH) systems is investigated. Focuses are on the enabling techniques such as optical-frequency-inte...
YAMAGUCHI Takashi, TAKAHASHI Yoshitomo, TODA Hiroyuki, KURI Toshiaki, KITAYAMA Ken-ichi
IEICE technical report   108(155) 55-60   Jul 2008
In this paper, we experimentally investigate the influence of multi-channel optical crosstalk in a 25-GHz spaced dense-wavelength division multiplexing (DWDM) millimeter-wave-band radio-over-fiber (RoF) downlink system. The eleven-channel crosstal...
TODA Hiroyuki, MIYASHITA Junichi, CHIBA Akito, SAKAMOTO Takahide, KAWANISHI Tetsuya, TSUCHIYA Masahiro, IZUTSU Masayuki
IEICE technical report   108(155) 65-67   Jul 2008
Quadruple two-tone lightwave of driving RF signal can be generated with a Mach-Zehnder modulator (MZM) operated at full-bias condition and an optical rejection filter to remove the output optical carrier. Recently, we reported that highly balanced...
Takahashi Yoshitomo, Yamaguchi Takashi, Toda Hiroyuki, Kuri Toshiaki, Kitayama Ken-ichi
Proceedings of the IEICE General Conference   2008(1)    Mar 2008
Toda Hiroyuki, Miyashita Junichi, Kiuchi Hitoshi, Chiba Akito, Sakamoto Takahide, Kawanishi Tetsuya, Tsuchiya Masahiro, Izutsu Masayuki
Proceedings of the IEICE General Conference   2008(1)    Mar 2008
Tetsuya Kawanishi, Takahide Sakamoto, Akito Chiba, Masahiro Tsuchiya, Hiroyuki Toda
Optics InfoBase Conference Papers      Jan 2008
Pure two-tone signal generation with spurious suppression ratio of 47 dB was demonstrated by using an optical Mach-Zehnder modulator with precisely balanced operation, where extinction ratio and chirp parameter were respectively 64 dB and 0.0099. ...
Ken ichi Kitayama, Toshiaki Kuri, J. J. Vegas Olmos, Hiroyuki Toda
Optics InfoBase Conference Papers      Jan 2008
Dense WDM access network of co-existing analog radio over fiber and digital FTTH systems is presented, by focusing on enabling techniques including optical frequency interleaving, supercontinuum light source, and optical channel allocation for wir...
Miyashita Junichi, Adachi Yuki, Toda Hiroyuki
Proceedings of the IEICE General Conference      2008
Hiroyuki Toda, Katsuya Fukuta, Daisuke Arai, Akito Chiba, Kiyotaka Sasagawa, Tetsuya Kawanishi, Masahiro Tsuchiya, Masayuki Izutsu
MWP 2007 - 2007 IEEE International Topical Meeting on Microwave Photonics   191-193   Dec 2007
We demonstrate that dc extinction ratio can be improved by reducing polarization crosstalk in high-extinction-ratio LiNbO3optical intensity modulator. Observed improvement was more than 25 dB for the modulator used in the experiment. However, for ...
Ken Ichi Kitayama, Toshiaki Kuri, Hiroyuki Toda, J. J Vegas Olmos
Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS   794-795   Dec 2007
Dense WDM access network which allows to co-exists analog radio over fiber and digital FTTH systems is investigated. Focuses are on the enabling techniques such as optical frequency interleaved DWDM grid assignment, supercontinuum light source, mu...
Yoshitomo Takahashi, Kiyokazu Matsuba, Takahiro Sono, Susumu Sadoshima, Hiroyuki Toda, Toshiaki Kuri, Ken Ich Kitayama
MWP 2007 - 2007 IEEE International Topical Meeting on Microwave Photonics   112-115   Dec 2007
We quantitatively investigate an influence of residual downlink optical sideband on uplink transmission in full-duplex dense wavelength division multiplexed (DWDM) millimeterwave-band (mm-wave-band) radio-over-fiber (RoF) system. From our previous...
Takahashi Yoshitomo, Matsuba Kiyokazu, Sono Takahiro, Sadoshima Susumu, Toda Hiroyuki, Kuri Toshiaki, Kitayama Ken-ich
Proceedings of the Society Conference of IEICE   2007(1)    Aug 2007
Toda Hiroyuki, Chiba Akito, Sasagawa Kiyotaka, Kawanishi Tetsuya, Tsuchiya Masahiro, Izutsu Masayuki
Proceedings of the Society Conference of IEICE   2007(1)    Aug 2007
TODA Hiroyuki, FUKUTA Katsuya, ARAI Daisuke, CHIBA Akito, SASAGAWA Kiyotaka, KAWANISHI Tetsuya, TSUCHIYA Masahiro, IZUTSU Masayuki
IEICE technical report   107(173) 175-178   Jul 2007
We demonstrate that dc extinction ratio can be improved by reducing polarization crosstalk in high-extinction-ratio LiNbO_3 optical intensity modulator. Observed improvement was more than 25 dB for the modulator used in the experiment. However, fo...
KURI Toshiaki, TODA Hiroyuki, KITAYAMA Ken-ichi
IEICE technical report   107(173) 127-130   Jul 2007
We newly propose a simple wavelength demultiplexer for optical-frequency-interleaved dense wavelength division multiplexed (DWDM) radio-over-fiber (RoF) systems, which consists of only an optical coupler and a 2xN arrayed waveguide grating. The de...
TAKAHASHI Yoshitomo, MATSUBA Kiyokazu, SONO Takahiro, SADOSHIMA Susumu, TODA Hiroyuki, KURI Toshiaki, KITAYAMA Ken-ich
IEICE technical report   107(173) 121-126   Jul 2007
We quantitatively investigate an influence of residual downlink optical sideband on uplink transmission in full-duplex dense wavelength division multiplexed (DWDM) millimeter-wave-band (mm-wave-band) radio-over-fiber (RoF) system. From our previou...

Works

 
Research on nonlinear optics and ultra-fast optical fiber transmission based on theory of integrable systems
1996 - 1999
Theoretical and experimental research on soliton transmission and generation
1998
Pico-second optical solitons, generation and application to ultra fast communication
1995 - 1996
Optical soliton communication -Application to the long distance and high data-bit communication-
1995 - 1996
Research on behavior of optical soliton and their application to ultra long distance, ultra high speed communications
1992 - 1995
Research on ultra-fast and large-capacity optical soliton transmission
1995
Theoretical investigation for multiplexing of optical soliton communications
1992 - 1994
Experimental research on application of optical solitons to long-distance and large-capacity communication
1993

Research Grants & Projects

 
Wavelength-division multiplexed radio on fiber
Project Year: 2000   
Research on ultra-fast fiber-optic transmission and optical signal processing using optical nonlinearity
Grant-in-Aid for Scientific Research
Project Year: 1992   

Patents

 
Wavelength division multiplex transmission system performance improving method involves transferring RZ format to NRZ format and detecting NRZ format at receiver (Performance of fiber transmission systems by transforming return-to-zero format to non-re・・・
US2003011839-A1
Wavelength division multiplex transmission system performance improving method involves transferring RZ format to NRZ format and detecting NRZ format at receiver (Performance of fiber transmission systems by transforming return-to-...
Performance of fiber transmission systems by transforming return-to-zero format to non-return-to-zero format in front of receiver
US2003011839-A1
Optical fiber measuring module
US2006001863-A1
Optical fiber mesuring module
WO2004/048889, AU2002349723(A1)
Optical fiber measuring module
AU2002349723(A1)
Optical fiber measuring module
US2006001863(A1)