Kensuke Ogawa

J-GLOBAL         Last updated: Nov 19, 2019 at 11:39
Kensuke Ogawa
Tokyo Institute of Technology
School of Engineering


More than thirty years of experience of photonics research and development through the international R&D collaboration and management with the centres of excellence and the renowned academic societies such as Cavendish Laboratory, University of Cambridge, UK; Institute of Microelectronics, ASTAR, Singapore; and The Optical Society (OSA). About fifteen years of contribution to the advance in optical-fiber communications with in-depth studies of the high-speed integrated photonic devices on silicon photonics platform.
・Fundamental studies on ultrafast photonic devices for optical communications and computing : “Polarisation dependence of excitonic-polariton propagation in a GaAs quantum-well waveguide,”Phys. Rev. Lett. Vol.64, No.7, 796-799 (1990)
・Experimental studies on dynamics of electron transport in nano-scale transistors using ultrashort pulse laser at Hitachi Cambridge Laboratory (adjunct as Visiting Scholar, University of Cambridge): “Ultrafast characterization of an in-plane gate transistor integrated with photoconductive switches,”Appl. Phys. Lett. Vol.66, No.10, 1228-1230 (1995)
・Research and development on chromatic dispersion compensation technology using photonic-crystal devices on silicon-photonics platform at Nanotechnology Institute associated with Mitsui & Co.: “Broadband variable chromatic dispersion in photonic-band electro-optic waveguide,”OFC/NFOEC 2006 OThE4
・Research and development on silicon-photonic integrated devices at Advanced Technology Laboratory, Fujikura Ltd.: “Silicon Mach-Zehnder modulator of extinction ratio beyond 10 dB at 10.0-12.5 Gbps,”Opt. Exp. Vol.20, No.26, B350-B356 (2012)
・Research on photonic integrated circuits on heterogeneous platforms at Tokyo Institute of technology (current position): Integrated Silicon-based Optical Modulators: 100 Gb/s and Beyond;

Academic & Professional Experience

Nov 2017
Specially Appointed Professor, Dept. Electrical and Electronic Eng., School of Eng., Tokyo Institute of Technology
Sep 2017
Oct 2017
Consultant, Japan Research Center, Huawei Technologies Japan K.K.
Jul 2006
Sep 2017
Chief Researcher, Advanced Technology Laboratory, Fujikura Ltd.
May 2002
Jun 2006
General Manager, Nanophotonics Department, XNRI
Oct 1994
Apr 2002
Senior Researcher, Central Research Laboratory, Hitachi, Ltd.


Apr 1982
Mar 1987
Graduate School of Science, Osaka University
Apr 1977
Mar 1982
Department of Physics, Faculty of Science, Osaka City University

Awards & Honors

Sep 2014
IEICE Electronics Society Activity Testimonial
Jul 2012
20-Gbps BPSK silicon Mach-Zehnder modulator with excellent chirp-free performance, Best Paper Award, OECC 2012 Committee

Published Papers

Kensuke Ogawa
2019 24th OptoElectronics and Communications Conference (OECC) and 2019 International Conference on Photonics in Switching and Computing (PSC)      2019   [Invited]
Integrated optical modulators on silicon-photonics platform are reviewed in the light of Vπ-loss tradeoff. Silicon-lithium niobite heterogeneous slot-mode waveguide is proposed for high-efficiency small-footprint electro-optic modulator free from ...
H. Zhu, K. Goi, and K. Ogawa
IEEE Journal of Selected Topics in Quantum Electronics   24(2) 4400207   2018   [Refereed]
We investigate the detection characteristics of a vertical p-n junction embedded waveguide in the low-gain region and strong avalanche gain region. Due to the “L” shape p-n junction and relatively high doping concentration, the photon absorption i...
Kazuhiro Goi, Norihiro Ishikura, Mikhail Illarionov, Haike Zhu, Kensuke Ogawa, Yuki Yoshida, Ken-ichi Kitayama, Tsung-Yang Liow, Xiaoguang Tu, Guo-Qiang Lo, and Dim-Lee Kwong
2017 Conference on Lasers and Electro-Optics Pacific Rim   s2505   2017   [Refereed][Invited]
We demonstrate high-speed modulations in dual-polarization (DP) quadrature phase shift keying and DP 16- and 32-quadrature amplitude modulation formats with radio frequency driving voltage as low as 2 Vppd using a packaged monolithic silicon DP in...
Kensuke Ogawa; Kazuhiro Goi; Norihiro Ishikura; Hiroki Ishihara; Shinichi Sakamoto; Tsung-Yang Liow; Xiaoguang Tu; Guo-Qiang Lo; Dim-Lee Kwong; Soon Thor Lim; Min Jie Sun; Ching Eng Png
Proceedings of SPIE   9752 975202   2016   [Refereed][Invited]
This paper focuses on latest progress in experimental and theoretical studies on silicon-based carrier-depletion PNjunction phase shifters in terms of high modulation efficiency for energy-efficient photonic networks of high transmission capacity....
Kazuhiro Goi, Norihiro Ishikura, Hiroki Ishihara, Shinichi Sakamoto, Kensuke Ogawa, Tsung-Yang Liow, Xiaoguang Tu, Guo-Qiang Lo, and Dim-Lee Kwong
Optical Fiber Communication Conference OSA Technical Digest (online) (Optical Society of America, 2016)   W2A.23   2016   [Refereed]
We demonstrate 10-Gb/s high-on/off-contrast modulation of a carrier-depletion silicon Mach-Zehnder modulator having 3-mm rib-waveguide phase shifter driven with RF 3.6 VPP or lower at temperatures up to 130 °C without thermo-electric cooling.

Books etc

Integrated Silicon-based Optical Modulators: 100 Gb/s and Beyond
Kensuke Ogawa
SPIE Press   May 2019   ISBN:9781510625815
This book discusses the principles and the latest progress of silicon optical modulators as cutting-edge integrated photonic devices on silicon-photonic platforms, which play key roles in modern optical communications with low power consumption, s...
Is Silicon Photonics a Competitive Technology to Enable Better and Highly Performing Networks?. In: Pavesi L., Lockwood D. (eds) Silicon Photonics III. Topics in Applied Physics, vol 122
Kensuke Ogawa (Part:Joint Work, Author of a chapter)
Springer-Verlag   Jan 2016   ISBN:978-3-642-10502-9
This chapter focuses on the fundamental and high-speed characteristics of small-footprint integrated optical modulators designed and fabricated on the basis of the silicon-photonic platform to assess their key performance factors in applications r...
Ultrafast Opto-electronics
Kensuke Ogawa (Part:Contributor)
Jul 2003   ISBN:4-89808-042-1

Conference Activities & Talks

Kensuke Ogawa
ICMAT 2019   26 Jun 2019   
Polarization-division-multiplexed (PDM) in-phase and quadrature (IQ) optical modulators on silicon-photonics platform allow high-speed optical signal generation at bit rates beyond 100 Gb/s/λ in applications to small form-factor pluggable PDM IQ c...
Kensuke Ogawa
20 Mar 2019   
Kensuke Ogawa
7 Dec 2018   
Research and development conducted by using integrated photonics platforms have enabled the realization of high-speed small-footprint optical transceivers in high-capacity optical communications. Silicon photonics provides, in particular, versatil...