Updated on 2026/04/28

写真a

 
KAWAHARA KEISUKE
 
Organization
School of Engineering Assistant Professor
Title
Assistant Professor
External link

Degree

  • Doctor of Engineering ( 2025.3   Yokohama National University )

  • Master of Engineering ( 2022.3   Tokyo University of Science )

  • Bachelor of Engineering ( 2020.3   Tokyo University of Science )

Research Interests

  • Electoronics-photonics integration

  • Electro-optic co-design

  • Integrated circuit

  • RF circuit

  • Silicon photonics

  • Modeling

  • Simulation

Research Areas

  • Nanotechnology/Materials / Optical engineering and photon science

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Communication and network engineering

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Electron device and electronic equipment

Education

  • Yokohama National University   Graduate school of Engineering Science   Department of Mathematics, Electrical Engineering and Computer Science

    2022.4 - 2025.3

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    Country： Japan

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  • Tokyo University of Science   Graduate School of Science and Technology   Department of Electrical Engineering

    2020.4 - 2022.3

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    Country： Japan

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  • Tokyo University of Science   Faculty of Science and Technology   Department of Electrical Engineering

    2016.4 - 2020.3

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    Country： Japan

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Research History

  • Institute of Science Tokyo   School of Engineering   Assistant Professor

    2025.4

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    Country：Japan

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  • Japan Society for the Promotion of Science   Research Fellow (DC2)

    2023.4 - 2025.3

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    Country：Japan

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  • Yokohama National University   Faculty of Engineering   Research Assistant

    2022.4 - 2023.3

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    Country：Japan

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Professional Memberships

Papers

  • Low-Voltage, Complex-DSP-Free 200G PAM4 / 140G OOK Operation of Si Photonic Crystal Slow-Light Modulator with Built-in EO Equalizer Reviewed International journal

    K. Kawahara, T. Tsuchizawa, N. Yamamoto, Y. Maegami, K. Yamada, N. Nishiyama, T. Baba

    Optical Fiber Communication Conference (OFC)   2026.3

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    Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)  

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  • High-Efficiency Compact Optical Transmitter With a Total Bit Energy of 0.78 pJ/bit Including Silicon Slow-Light Modulator and Open-Collector Current-Mode Driver Reviewed International journal

    Keisuke Kawahara, Tai Tsuchizawa, Notitsugu Yamamoto, Yuriko Maegami, Koji Yamada, Shinsuke Hara, Toshihiko Baba

    IEEE Journal of Selected Topics in Quantum Electronics   32 ( 2 )   3400111   2025.12

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Institute of Electrical and Electronics Engineers (IEEE)  

    Increasing datacenter demands require power-efficient optical interconnects. However, a conventional standard transmitter using a silicon rib-waveguide Mach-Zehnder modulator and voltage-mode driver has low efficiency and consumes watt-class high power and occupies a several-square-millimeter footprint, which limits large-scale integration for parallel transmission. This paper presents a transmitter consisting of a compact photonic crystal waveguide (PCW) modulator and a current-mode open-collector driver. The PCW modulator is designed to have high impedance in addition to the slow-light effect. The driver connected to the modulator without termination resistors is optimized based on electronics-photonics co-simulations using a standard electronic circuit simulator with an in-house photonic model library. Co-packaging these dramatically reduces the power consumption to 50 mW and a bit energy to 0.78 pJ/bit at 64-Gbaud, and the footprint to 0.66 mm2. This result represents a significant advancement toward the integration of a large number of transmission channels with no temperature control.

    File： JSTQE3640645.pdf

    DOI： 10.1109/jstqe.2025.3640645

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  • Electro-Optic Co-Simulation in High-Speed Silicon Photonics Transceiver Design Using Standard Electronic Circuit Simulator Reviewed International journal

    Keisuke Kawahara, Toshihiko Baba

    IEEE Journal of Microwaves   5 ( 4 )   983 - 995   2025.5

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Institute of Electrical and Electronics Engineers (IEEE)  

    The increasing demand for high-speed optical interconnects requires the integration of photonics and electronics, with electro-optic (EO) co-simulation being crucial. However, fragmented electronic/photonic simulators and incomplete models, which do not include the radio-frequency characteristics and noise, are still prevalent, and thus, an EO co-simulation environment for high-speed transceiver design has not yet been established. Here, we present a unified and experimentally validated EO co-simulation library that enables accurate transmission performance predictions at symbol rates exceeding 50 Gbaud. Specifically, we model passive photonic components, such as waveguides and couplers, as well as two types of Si Mach–Zehnder modulators, incorporating frequency-dependent lossy traveling-wave electrodes and slow-light enhancement. We also show models for test equipment with validated noise characteristics, including an erbium-doped fiber amplifier (EDFA), a tunable filter, and a photodetector module, to construct a full optical link testbench. The S-parameter simulations agreed well with measurements up to 40 GHz, and the signal transmission simulations matched measurements up to 64 Gbps. All models and sample testbenches are available on GitHub.

    File： Electro-Optic_Co-Simulation_in_High-Speed_Silicon_Photonics_Transceiver_Design_Using_Standard_Electronic_Circuit_Simulator.pdf

    DOI： 10.1109/jmw.2025.3576358

    arXiv

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  • High-speed, low-voltage, low-bit-energy silicon photonic crystal slow-light modulator with impedance-engineered distributed electrodes Reviewed International journal

    Keisuke Kawahara, Tai Tsuchizawa, Noritsugu Yamamoto, Yuriko Maegami, Koji Yamada, Shinsuke Hara, Toshihiko Baba

    Optica   11 ( 9 )   1212 - 1219   2024.8

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Optica Publishing Group  

    Silicon modulators in optical transceivers feature high-density integration and low manufacturing cost, but they also need to deliver high speed and low power consumption to meet the demands of future data centers and high-performance computing. This paper demonstrates a significantly improved 64 Gbps silicon Mach–Zehnder modulator incorporating photonic crystal slow-light phase shifters. By employing distributed electrodes and engineering their impedance, electro-optic phase matching and electrical impedance matching were obtained simultaneously, and the driving voltage was reduced to 0.87 V, which is compatible with fin-type field effect transistors and eliminates the need for additional electrical amplifiers. The bit energy of as low as 59 fJ/bit is comparable to that of microring modulators, while this modulator does not require temperature control like that used for microring modulators, due to its wide working spectrum of 6 nm. These results indicate the potential for addressing power issues in next-generation data infrastructures.

    File： Kawahara et al. - 2024 - Optica.pdf

    DOI： 10.1364/optica.531372

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  • A 0.0058-mm2 Inductor-Less CMOS Active Balun With Gain and Phase Errors Within −0.1 ± 0.2 dB and −0.18 ± 1.17° From DC to 8 GHz Reviewed International journal

    Keisuke Kawahara, Yohtaro Umeda, Kyoya Takano, Shinsuke Hara

    IEEE Transactions on Circuits and Systems I: Regular Papers   70 ( 6 )   2317 - 2330   2023.6

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Institute of Electrical and Electronics Engineers (IEEE)  

    This paper presents a low-imbalance and inductor-less active balun. The large immittance of the parasitics increases gain and phase errors in single-ended-to-differential conversion at high frequencies. Positive feedback is effective in reducing these errors. However, there is a trade-off between the stability of the feedback and the imbalance correction. This paper analyzes this trade-off, and the common-mode rejection ratio (CMRR) was improved by adding a capacitor. Besides, we established the feedback loops for the imbalance correction are also available for bandwidth extension, that is the additional capacitor improves not only the CMRR but also the high-frequency gain. This peaking technique removes inductors that consume large chip areas. The balun was fabricated in a 0.18- μm CMOS process and achieved a small core area of 0.0058 mm2. In addition, a self-bias scheme using a current mirror was devised. It ensures a good bias current balance and reduces errors. The manufacturing variation of the fabricated baluns was statistically evaluated. To obtain the 99.7% limit of the CMRR, we extended the theory of the random CMRR to the complex plane. The measurement results demonstrated small errors within −0.1±0.2 dB and −0.18±1.17° including a variation of ±3σ from DC to 8.0 GHz.

    DOI： 10.1109/TCSI.2023.3257089

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  • A Compact Fully-Differential Distributed Amplifier With Coupled Inductors in 0.18-μm CMOS Technology Reviewed International journal

    Keisuke Kawahara, Yohtaro Umeda, Kyoya Takano, Shinsuke Hara

    IEICE Transactions on Electronics   E106.C ( 11 )   669 - 676   2023.4

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Institute of Electronics, Information and Communications Engineers ({IEICE})  

    This paper presents a compact fully-differential distributed amplifier using a coupled inductor. Differential distributed amplifiers are widely required in optical communication systems. Most of the distributed amplifiers reported in the past are single-ended or pseudo-differential topologies. In addition, the differential distributed amplifiers require many inductors, which increases the silicon cost. In this study, we use differentially coupled inductors to reduce the chip area to less than half and eliminate the difficulties in layout design. The challenge in using coupled inductors is the capacitive parasitic coupling that degrades the flatness of frequency response. To address this challenge, the odd-mode image parameters of a differential artificial transmission line are derived using a simple loss-less model. Based on the analytical results, we optimize the dimensions of the inductor with the gradient descent algorithm to achieve accurate impedance matching and phase matching. The amplifier was fabricated in 0.18-µm CMOS technology. The core area of the amplifier is 0.27 mm2, which is 57% smaller than the previous work. Besides, we demonstrated a small group delay variation of ±2.7 ps thanks to the optimization. the amplifier successfully performed 30-Gbps NRZ and PAM4 transmissions with superior jitter performance. The proposed technique will promote the high-density integration of differential traveling wave devices.

    File： A Compact Fully-Differential Distributed Amplifier With Coupled Inductors in 0.18-μm CMOS Technology.pdf

    DOI： 10.1587/transele.2023mmp0006

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  • Bandwidth Tripler: Broadband Signal Generation With an Image-Rejection Analog Multiplexer for Fiber Optic Transmitters Reviewed International journal

    Keisuke Kawahara, Joe Sawada, Takumi Kamo, Yohtaro Umeda, Kyoya Takano, Shinsuke Hara

    IEEE Transactions on Microwave Theory and Techniques   71 ( 1 )   22 - 34   2023.1

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Institute of Electrical and Electronics Engineers (IEEE)  

    This article describes a frequency-interleaved digital-to-analog conversion technique named bandwidth tripler with an image-rejection analog multiplexer (AMUX). The tripler extends the bandwidth of the parallelized sub-digital-to-analog converters (DACs) by three times in the frequency domain. Image rejection using the phase-shifted method reduces analog filters for combining divided sub-bands, which improves the signal quality and size of the analog circuits. Besides, the tripler outputs no spurious signals out of the target bandwidth. The AMUX for the tripler was fabricated in 180-nm CMOS technology. Pseudo-differential switches were used to reduce distortion, and a broadband termination circuit was inserted at the output of the AMUX to compensate for the limited performance of the CMOS devices. The fabricated AMUX was evaluated by S-parameter and time-domain measurements. The S-parameter measurement results demonstrated a bandwidth of 23.4 GHz. In addition, broadband signal generation for 30 Gbps PAM4 was demonstrated without using any equalization. The power consumption of the AMUX was only 49 mW. This high-speed performance is comparable to the conventional DACs fabricated using advanced CMOS processes.

    DOI： 10.1109/TMTT.2022.3190480

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  • Slow-light based modulator and transmitter Invited Reviewed International journal

    Toshihiko Baba, Keisuke Kawahara

    SPIE Active Photonic Platforms (APP) 2025   Paper 13578-40   2025.8

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPIE  

    DOI： 10.1117/12.3065287

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  • High-Efficiency Optical Transmitter Including Si Photonic Crystal Slow-Light Modulator Co-Designed with Driver Amplifier Invited Reviewed

    Toshihiko Baba, Keisuke Kawahara

    2025 30th OptoElectronics and Communications Conference (OECC) and 2025 International Conference on Photonics in Switching and Computing (PSC)   1 - 3   2025.6

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

    DOI： 10.23919/oecc/psc62146.2025.11111627

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  • [Post-Deadline Paper]Optical Transmitter with Silicon Slow-Light Modulator and BiCMOS Current-Mode Driver Achieving 0.78 pJ/Bit Total Bit Energy and 0.66 mm2 Footprint Reviewed

    Keisuke Kawahara, Tai Tsuchizawa, Noritsugu Yamamoto, Yuriko Maegami, Koji Yamada, Shinsuke Hara, Toshihiko Baba

    2025 30th OptoElectronics and Communications Conference (OECC) and 2025 International Conference on Photonics in Switching and Computing (PSC)   1 - 4   2025.6

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    Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

    DOI： 10.23919/oecc/psc62146.2025.11110745

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  • Accurate EO co-simulation of Si photonics using a standard electronic circuit simulator Reviewed International journal

    Keisuke Kawahara, Toshihiko Baba

    Smart Photonic and Optoelectronic Integrated Circuits 2025   27 - 27   2025.3

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    Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPIE  

    DOI： 10.1117/12.3043996

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  • Electro-Optic Co-Design of Integrated Silicon Photonics Transmitter

    Keisuke Kawahara

    Doctoral Dissertation, Yokohama National University   2025.3

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Doctoral thesis  

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  • 光電融合設計による小型高性能マッハ・ツェンダー光変調器 Invited

    馬場俊彦, 川原啓輔

    光学   54 ( 4 )   2025

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    Language：Japanese   Publishing type：Part of collection (book)   Publisher：日本光学会  

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  • 1.9-pJ/bit 0.5-mm2 High-Speed Optical Transmitter including Silicon Slow-Light Modulator and Current-Mode BiCMOS Driver Reviewed International journal

    Kawahara, Keisuke, Tsuchizawa, Tai, Yamamoto, Noritsugu, Maegami, Yuriko, Yamada, Koji, Hara, Shinsuke, Baba, Toshihiko

    50th European Conference on Optical Communication (ECOC)   778 - 781   2024.9

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    Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：VDE  

    A high-speed optical transmitter including a silicon slow-light Mach-Zehnder modulator and a current-mode BiCMOS driver was EO co-designed and integrated. We experimentally achieved a 1.9-pJ/bit total efficiency and a 0.5-mm2 footprint.

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  • DAC- and DSP-Free Optical Transmitter Based on Triple-Parallel Si Mach-Zehnder Modulators Reviewed International journal

    Keisuke Kawahara, Toshihiko Baba

    2024 IEEE Silicon Photonics Conference (SiPhotonics)   2024.4

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    Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

    Triple-parallel Si Mach-Zehnder modulators can be used for PAM generation, pre-distortion, and pre-emphasis without using a DSP and electrical DAC. It reduces the total power consumption of the optical transmitter to 1/3.

    DOI： 10.1109/siphotonics60897.2024.10544370

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  • 59-fJ/bit Si Photonic Crystal Slow-Light Modulator with FinFET-Compatible Driving Voltage Reviewed International journal

    Keisuke Kawahara, Tai Tsuchizawa, Noritsugu Yamamoto, Yuriko Maegami, Koji Yamada, Toshihiko Baba

    Optical Fiber Communication Conference (OFC)   2024.3

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    Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Optica Publishing Group  

    Si Mach-Zehnder modulator with slow-light enhancement of photonic crystal phase shifter consumes a low bit energy of 59 fJ/bit and transmits a 64-Gbaud NRZ signal with a FinFET-compatible driving voltage of 0.87 V.

    DOI： 10.1364/ofc.2024.m2d.5

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    Other Link： https://ieeexplore.ieee.org/document/10527056

  • Electro-Optic Equalization in Si Photonic Crystal Optical Modulators for Bandwidth Extension Reviewed International journal

    Keisuke Kawahara, Toshihiko Baba

    The 28th Opto-Electronics and Communications Conference (OECC)   2023.7

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    Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)  

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  • Signal Bandwidth Tripling in Si Optical Modulators Using an Image-Rejection Analog Multiplexer Reviewed International journal

    Keisuke Kawahara, Toshihiko Baba

    The 28th Opto-Electronics and Communications Conference (OECC)   2023.7

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    Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)  

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  • Modeling of Si Rib and Photonic Crystal Mach-Zehnder Modulators for Electro-Optic Co-Simulation up to 64 Gbaud Reviewed International journal

    Keisuke Kawahara, Toshihiko Baba

    2023 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)   2023.6

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    Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

    DOI： 10.1109/nemo56117.2023.10202301

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  • Research on Transmitter Circuit Technologies for Next-Generation High-Capacity Optical Fiber Communications

    Keisuke Kawahara

    Master’s Thesis, Tokyo University of Science   2022.3

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    Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Doctoral thesis  

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  • A 50 Gbps 49 mW CMOS Analog Multiplexer for a DAC Bandwidth Tripler Reviewed International journal

    Keisuke Kawahara, Joe Sawada, Takumi Kamo, Yohtaro Umeda, Kyoya Takano

    2022 IEEE Radio and Wireless Symposium (RWS)   2022.1

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    Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

    DOI： 10.1109/rws53089.2022.9719979

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  • A Broadband Active Balun with Inductor-Less Active Peaking and Imbalance Correction Reviewed International journal

    Keisuke Kawahara, Yohtaro Umeda, Kyoya Takano

    2021 IEEE International Midwest Symposium on Circuits and Systems (MWSCAS)   2021.8

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    Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

    DOI： 10.1109/mwscas47672.2021.9531759

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  • Design of an Area-Efficient Differential Distributed Amplifier Based on the Theory of Differential Transmission Lines Reviewed International journal

    Keisuke Kawahara, Yohtaro Umeda, Kyoya Takano

    2021 IEEE International Symposium on Circuits and Systems (ISCAS)   2021.5

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    Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

    DOI： 10.1109/iscas51556.2021.9401302

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  • 40 Gbps 180 nm CMOS Modulator Driver Using Loss Compensation Gain Cells Reviewed International journal

    Keisuke Kawahara, Yohtaro Umeda, Kyoya Takano

    2020 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT)   2020.9

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    Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

    DOI： 10.1109/rfit49453.2020.9226250

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Books

  • 光電協調設計の最新動向

    川原啓輔（ Role： Contributor11月号 特集 AI時代の光ネットワークに向けた光デバイス，実装技術）

    株式会社オプトロニクス社  2025.11 

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    Language：Japanese  

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MISC

  • High-Efficiency Vertical Coupler between Si and Low-index (~1.6) SiON Waveguide with Low Polarization Dependance Loss

    Haoyu Chen, Moataz Eissa, Kaibin Yao, Tsuyoshi Horikawa, Keisuke Kawahara, Nobuhiko Nishiyama

    応用物理学会 春季学術講演会 講演論文集   17p-WL2_401-6   2026.3

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    Language：English   Publishing type：Research paper, summary (national, other academic conference)  

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  • Investigation of fabrication process for Co-integration of Heterogeneous Material /MEMS on SOI Substrates toward realizing higher functional PICs

    2026.3

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    Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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  • Silicon Photonic Monolithically Integrated Temperature Sensor Circuit Using Side-Gate MOSFETs

    Keisuke Kawahara, Nobuhiko Nishiyama

    C-3_C-4-55   2026.3

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    Authorship：Lead author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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  • Design and Analysis of a-Si Loaded Thin-Film LN Optical Modulator on Quartz Substrate

    Kazuya Miura, Keisuke Kawahara, Tsuyoshi Horikawa, Yoshitaka Oiso, Nobuhiko Nishiyama, Ryuga Yajima, Kentaro Nonaka

    C-4-41   2026.3

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    Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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  • [注目講演]光電気等化によるSiフォトニック結晶光変調器の100 Gbaud動作

    川原啓輔, 土澤泰, 山本宗継, 前神有里子, 山田浩治, 馬場俊彦

    応用物理学会 秋季学術講演会 講演論文集   9a-N202-9   2025.9

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    Authorship：Lead author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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  • 100 Gbaud級シリコンフォトニクス送信機の光電協調設計

    川原啓輔, 土澤泰, 山本宗継, 前神有里子, 山田浩治, 西山伸彦, 馬場俊彦

    第2回末松カンファレンス   2025.8

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    Authorship：Lead author   Language：Japanese  

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  • Accurate EO co-simulation of Si photonics using a standard electronic circuit simulator

    Keisuke Kawahara, Toshihiko Baba

    17p-K305-3   2025.3

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    Authorship：Lead author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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  • 光電協調設計による高速・低電力シリコン光送信機の研究

    川原啓輔, 土澤泰, 山本宗継, 前神有里子, 山田浩治, 馬場俊彦

    第1回末松カンファレンス   2024.8

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    Authorship：Lead author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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  • インダクタピーキング出力バッファを用いた能動帰還能動バランの高周波化

    畑田修治郎, 川原啓輔, 楳田洋太郎, 高野恭弥

    電子情報通信学会 総合大会 講演論文集   C-12-36   2024.3

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    Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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  • Sub-1-V 59-fJ/bit Si Photonic Crystal Slow-Light Optical Modulator

    Keisuke Kawahara, Tai Tsuchizawa, Noritsugu Yamamoto, Yuriko Maegami, Koji Yamada, Toshihiko Baba

    2024.3

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    Authorship：Lead author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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  • Low-Power Optical Modulator Driver Using an Open-Collector ft-Doubler Output Stage

    Keisuke Kawahara, Toshihiko Baba

    C-12-26   2024.3

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    Authorship：Lead author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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  • 負性RC回路による損失補償を用いた差動分布型ドライバ増幅器

    川原啓輔, 馬場俊彦

    電子情報通信学会 ソサイエティ大会 講演論文集   C-12-18   2023.9

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    Authorship：Lead author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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  • 低電力フレキシブル送信機のための3並列Si Mach-Zehnder光変調器

    川原啓輔, 馬場俊彦

    応用物理学会 秋季学術講演会 講演論文集   20p-A201-11   2023.9

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    Authorship：Lead author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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  • 光電ハイブリッド集積高効率 Si 光送信機の研究

    川原啓輔, 馬場俊彦

    第45回光通信研究会   2023.8

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    Authorship：Lead author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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  • 光電ハイブリッド集積送信機フロントエンドの開発

    川原啓輔, 馬場俊彦

    LSIとシステムのワークショップ   2023.5

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    Authorship：Lead author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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  • 光電気FIR等化によるSiフォトニック結晶光変調器の広帯域化

    川原啓輔, 馬場俊彦

    応用物理学会 春季学術講演会 講演論文集   16a-A409-9   2023.3

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    Authorship：Lead author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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  • Si フォトニック結晶光変調器のための縦積みオープンコレクタBiCMOSドライバ

    川原啓輔, 馬場俊彦

    電子情報通信学会 総合大会 講演論文集   C-12-6   2023.3

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    Authorship：Lead author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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  • Si光変調器を用いたイメージ除去AMUXによる光領域帯域3倍拡張

    川原啓輔, 馬場俊彦

    応用物理学会 春季学術講演会 講演論文集   16a-A409-10   2023.3

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    Authorship：Lead author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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  • 光送信機用DAC帯域3逓倍回路におけるバンド間レベル差の理論式の評価

    石井颯, 川原啓輔, 楳田洋太郎, 高野恭弥

    電子情報通信学会 技術研究報告(信学技報)   122 ( 253 )   19 - 24   2022.11

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    Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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  • 64 Gbps Si フォトニック結晶光変調器の変調効率改善

    川原啓輔, 鎌田幹也, 雛倉陽介, 岡野誠, Guangwei Cong, 山本宗継, 山田浩治, 馬場俊彦

    応用物理学会 秋季学術講演会 講演論文集   21p-A205-6   2022.9

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  • 偏差補正と能動ピーキングを用いたインダクタレス広帯域能動バラン

    川原啓輔, 楳田洋太郎, 高野恭弥

    電子情報通信学会 技術研究報告（信学技報）   121 ( 360 )   1 - 6   2022.1

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    Authorship：Lead author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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  • 光電協調設計による高速低電力Si光送信機の開発

    川原啓輔

    第44回光通信研究会   P-2-26   2022

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    Authorship：Lead author,　Last author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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  • 結合インダクタを用いた差動分布型増幅器の解析と設計

    川原啓輔, 楳田洋太郎, 高野恭弥, 原紳介

    電子情報通信学会 技術研究報告(信学技報)   121 ( 303 )   43 - 48   2021.12

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    Authorship：Lead author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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  • 50 Gbps/49 mW 3:1 CMOSアナログマルチプレクサ

    川原啓輔

    d.lab-VDECデザイナーズフォーラム   2021.9

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    Authorship：Lead author,　Last author   Language：Japanese   Publishing type：Research paper, summary (national, other academic conference)  

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  • DAC帯域３逓倍のためのCMOSアナログマルチプレクサ

    川原啓輔, 楳田洋太郎, 高野恭弥

    電子情報通信学会 ソサイエティ大会 講演論文集   C-12-16   2021.9

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  • 0.18μm CMOSプロセスにむけた準ミリ波帯対応RFセルライブラリの開発

    川原啓輔, 楳田洋太郎, 高野恭弥, 原紳介

    LSIとシステムのワークショップ   2021.5

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  • 疑似フラクタル状に曲げた伝送線路を用いた省面積分布型増幅器の試作検討

    川原啓輔, 楳田洋太郎, 高野恭弥, 原紳介

    電子情報通信学会 技術研究報告（信学技報）   121 ( 31 )   22 - 27   2021.3

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  • 誘導結合を用いた分布型差動増幅回路の省面積化

    川原啓輔, 楳田洋太郎, 高野恭弥

    電子情報通信学会 ソサイエティ大会 講演論文集   C-12-15   2020.9

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  • Electromagnetic Analysis of On-chip Spiral Inductors Considering a Conductive Layer on the Surface of a Silicon Substrate

    C-12-31   2020.3

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Presentations

  • Silicon slow-light-based modulators and high-efficiency optical transmitters Invited International conference

    Toshihiko Baba, Keisuke Kawahara

    European Conference on Optical Communications (ECOC) 

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    Event date： 2026.9

    Language：English   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

    Venue：Málaga   Country：Spain  

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  • High-speed and high-efficiency slow light modulators and transmitters Invited International conference

    Toshihiko Baba, Keisuke Kawahara

    Conference on Lasers and Electro-Optics (CLEO) 

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    Event date： 2026.5

    Language：English   Presentation type：Oral presentation (invited, special)  

    Venue：Charlotte, NC   Country：United States  

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  • Electronic-photonic co-design across devices, circuits, and systems toward multi-terabit co-packaged optics Invited International conference

    Keisuke Kawahara, Nobuhiko Nishiyama

    PICS Japan/Taiwan Silicon Photonics Joint Workshop  2026.3  IEICE

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    Event date： 2026.3

    Language：English   Presentation type：Oral presentation (invited, special)  

    Venue：National Taiwan University of Science & Technology, Taipei   Country：Taiwan, Province of China  

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  • Investigation of fabrication process for co-integration of heterogeneous material /MEMS on SOI substrates toward realizing higher functional PICs International conference

    Daiki Sakurai, Yoshishige Tsuchiya, Yoshitaka Oiso, Kaibin Yao, Haoyu Chen, Eissa Moataz, Tsuyoshi Horikawa, Keisuke Kawahara, Nobuhiko Nishiyama

    PICS Japan/Taiwan Silicon Photonics Joint Workshop  2026.3  IEICE

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    Event date： 2026.3

    Language：English   Presentation type：Poster presentation  

    Venue：National Taiwan University of Science & Technology, Taipei   Country：Taiwan, Province of China  

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  • Design and Analysis of Slow-Wave Electrodes for a-Si Loaded TFLN Modulators on Quartz Substrate International conference

    Kazuya Miura, Keisuke Kawahara, Tsuyoshi Horikawa, Moataz Eissa, Yoshitaka Oiso, Nobuhiko Nishiyama, Ryuga Yajima, Kentaro Nonaka

    PICS Japan/Taiwan Silicon Photonics Joint Workshop  2026.3  IEICE

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    Event date： 2026.3

    Language：English   Presentation type：Poster presentation  

    Venue：National Taiwan University of Science & Technology, Taipei   Country：Taiwan, Province of China  

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  • Electronic-Photonic Co-Designed Silicon Slow-Light Transmitter Toward Multi-Terabit Interconnects

    Keisuke Kawahara

    Science Tokyo ASPIRE Meeting at ISSCC 2026  2026.2 

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    Event date： 2026.2

    Language：English   Presentation type：Poster presentation  

    Venue：San Francisco Marriott Marquis   Country：United States  

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  • Electro-Optic Co-Simulation in High-Speed Silicon Photonics Transceiver Design Using Standard Electronic Circuit Simulator Invited International conference

    Keisuke Kawahara, Toshihiko Baba

    2026 IEEE Radio and Wireless Symposium  2026.1  Institute of Electrical and Electronics Engineers (IEEE)

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    Event date： 2026.1

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Los Angeles / Hollywood, CA   Country：United States  

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  • シリコンスローライト変調器とBiCMOS電流モードドライバを用いた0.78 pJ/bit，0.66 mm²光送信機 Invited

    川原啓輔, 土澤泰, 山本宗継, 前神有里子, 山田浩治, 原紳介, 馬場俊彦

    Photonic Device Workshop ホットトピックス講演  2025.12  電子情報通信学会

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    Event date： 2025.12

    Language：Japanese   Presentation type：Oral presentation (invited, special)  

    Venue：機械振興会館   Country：Japan  

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  • High Efficiency Layer-to-Layer Coupler between Si and SiON Waveguides using Low Index(~1.6) SiON

    Haoyu Chen, Eissa Moataz, Kaibin Yao, Tsuyoshi Horikawa, Keisuke Kawahara, Nobuhiko, Nishiyama

    15th International Symposium on Photonics and Electronics Convergence (ISPEC)  2025.11 

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    Event date： 2025.11

    Language：English   Presentation type：Poster presentation  

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  • Frequency Response Shaping of Si Photonic Crystal Slow-Light Modulator using Electro-Optic Equalizer

    Keisuke Kawahara, Tai Tsuchizawa, Noritsugu Yamamoto, Yuriko Maegami, Koji Yamada, Nobuhiko Nishiyama, Toshihiko Baba

    15th International Symposium on Photonics and Electronics Convergence (ISPEC)  2025.11 

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    Event date： 2025.11

    Language：English   Presentation type：Poster presentation  

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  • Photonic crystal slow-light modulator toward co-packaged optics Invited International conference

    Toshihiko Baba, Keisuke Kawahara

    The 14th International Symposium on Photonic and Electromagnetic Crystal Structures (PECS-XIV)  2025.11 

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    Event date： 2025.11

    Language：English   Presentation type：Oral presentation (invited, special)  

    Venue：Glasgow Grosvenor Hotel, Glasgow, Scotland   Country：United Kingdom  

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  • 100-Gbaud Si Photonic Crystal Modulator Using Electro-Optic Equalizer International conference

    Keisuke Kawahara, Tai Tsuchizawa, Noritsugu Yamamoto, Yuriko Maegami, Koji Yamada, Nobuhiko Nishiyama, Toshihiko Baba

    The 14th International Symposium on Photonic and Electromagnetic Crystal Structures (PECS-XIV)  2025.11 

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    Event date： 2025.11

    Language：English   Presentation type：Poster presentation  

    Venue：Glasgow Grosvenor Hotel, Glasgow, Scotland   Country：United Kingdom  

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  • 集積シリコンフォトニクス光送信機の光電融合設計 Invited

    川原啓輔

    OPIE '25 セミナーセッション「光電融合技術が切り拓く通信・情報処理の新時代」  2025.4  オプトロニクス社

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    Event date： 2025.4

    Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

    Venue：パシフィコ横浜   Country：Japan  

    データセンターの大規模化と消費電力の増加に伴い、高速・低消費電力な光インターコネクションの重要性が高まっている。ASICの直近に光トランシーバを配置するコパッケージド・オプティクスの開発が進展しており、中でも、シリコンフォトニクスは高い集積性や量産性の観点から注目を集めている。

    従来のプラガブル光トランシーバでは、電子回路と光デバイスを個別に設計する手法が一般的であったが、フットプリントや電力効率の向上には限界があった。そのため、我々はこれを打破する手法として光電融合設計を提案している。
    本講演では、融合設計環境の開発に加え、集積シリコン光送信機の試作とその実証結果について紹介する。

    融合設計では、電子回路と光デバイスを単一のシミュレーション環境で取り扱うことが望まれる。そこで、業界標準の電子回路シミュレータを用いて光と電気の協調シミュレーションを可能にするフォトニクスモデルライブラリを開発した。
    これにより、コパッケージトランシーバ全体の性能を高精度に予測できるようになり、電子回路と光デバイスの特性を考慮した新たな回路アーキテクチャやデバイス構造の開発が可能になった。これを用いて、高電力効率かつ省フットプリントな集積シリコン光送信機を開発し、従来設計に対する優位性を実証した。また、融合システムによりディジタル信号処理などの機能を実現することで、さらなる電力効率向上も期待される。

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  • Electro-Optic Co-Design of an Integrated Silicon Photonics Transmitter Invited

    Keisuke Kawahara, Tai Tsuchizawa, Noritsugu Yamamoto, Yuriko Maegami, Koji Yamada, Shinsuke Hara, Toshihiko Bab

    IEICE General Conference  2025.3  IEICE

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    Event date： 2025.3

    Language：Japanese   Presentation type：Oral presentation (invited, special)  

    Venue：Tokyo City University, Setagaya Campus   Country：Japan  

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  • [特別講演]帯域トリプラ:光ファイバ送信機のためのイメージ除去アナログマルチプレクサを用いた広帯域信号生成 Invited

    川原 啓輔, 澤田 晟, 加茂 巧, 楳田 洋太郎, 高野 恭弥, 原 紳介

    電子情報通信学会マイクロ波研究会  2025.1  電子情報通信学会

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    Event date： 2025.1

    Language：Japanese   Presentation type：Oral presentation (invited, special)  

    Venue：深谷公民館・深谷生涯学習センター   Country：Japan  

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  • 0.87 V, 59 fJ/bit, 64 Gbps Si Photonic Crystal Slow-Light Modulator

    2024.9  The Japan Society of Applied Physics

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    Event date： 2024.9

    Language：Japanese   Presentation type：Oral presentation (invited, special)  

    Venue：TOKI MESSE, Niigata   Country：Japan  

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  • シリコンフォトニクスの光電融合開発

    川原啓輔

    日本学術会議国際光デー記念シンポジウム  2024.7  日本学術会議総合工学委員会ＩＣＯ分科会

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    Event date： 2024.7

    Language：Japanese   Presentation type：Poster presentation  

    Venue：日本学術会議講堂   Country：Japan  

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  • 新進気鋭の若手・中堅研究者講演「高効率シリコン光送信機の光電協調設計」 Invited

    川原啓輔, 土澤泰, 山本宗継, 前神有里子, 山田浩治, 馬場俊彦

    第3期第2回PICS研究会  2024.7  電子情報通信学会光集積及びシリコンフォトニクス研究会

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    Event date： 2024.7

    Language：Japanese   Presentation type：Oral presentation (invited, special)  

    Venue：富山県黒部市 宇奈月温泉 延対寺荘   Country：Japan  

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  • Triple-Parallel Si Mach-Zehnder Optical Modulators for Low-Power Flexible Transmitters

    Keisuke Kawahara, Toshihiko Baba

    13th International Symposium on Photonics and Electronics Convergence (ISPEC)  2023.11 

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    Event date： 2023.11

    Language：English   Presentation type：Poster presentation  

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  • 64-Gbps 3.5-Vpp Si Photonic Crystal Slow Light Optical Modulators International conference

    Keisuke Kawahara, Mikiya Kamata, Yosuke Hinakura, Makoto Okano, Cong Guangwei, Noritsugu Yamamoto, Koji Yamada, Toshihiko Baba

    The 13th International Symposium on Photonic and Electromagnetic Crystal Structures (PECS-XIII)  2023.3 

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    Event date： 2023.3

    Language：English   Presentation type：Poster presentation  

    Venue：Kanda-Myoujin Hall, Tokyo  

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  • 光電協調設計による集積シリコン光送信機の進展と課題

    川原啓輔

    日本学術会議国際光デー記念シンポジウム  2025.7  日本学術会議総合工学委員会ICO分科会

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    Language：Japanese   Presentation type：Poster presentation  

    Venue：日本学術会議講堂   Country：Japan  

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  • マイクロ波研究会学生研究発表賞受賞者による特別講演「偏差補正と能動ピーキングを用いたインダクタレス広帯域能動バラン」

    川原啓輔

    電子情報通信学会 総合大会  2022.3 

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    Language：Japanese   Presentation type：Oral presentation (invited, special)  

    Country：Japan  

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  • 第39回財団賞受賞作品代表者によるショートプレゼンテーション「A 0.0058-mm2 Inductor-Less CMOS Active Balun With Gain and Phase Errors Within −0.1 ± 0.2 dB and −0.18 ± 1.17° From DC to 8 GHz」

    川原啓輔

    電気通信普及財団賞 第4回特別講演・交流会  2024.5  電気通信普及財団

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    Language：Japanese   Presentation type：Oral presentation (invited, special)  

    Venue：情報通信総合研究所   Country：Japan  

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  • [Introductory talk] 光電気協調設計によるシリコンフォトニクスの設計と試作検証 Invited

    川原啓輔

    第2回シリコンフォトニクスユーザーワークショップ  2026.4  電子情報通信学会PICS研究会

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    Language：Japanese   Presentation type：Oral presentation (invited, special)  

    Venue：Incubation CANVAS TOKYO (京橋エドグラン)   Country：Japan  

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Works

Awards

  • PDW 2025 ホットトピックス講演

    2025.11   電子情報通信学会  

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    Award type：Award from Japanese society, conference, symposium, etc.  Country：Japan

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  • 社会変革チャレンジ賞

    2025.6   東京科学大学イノベーションデザイン機構   光電融合半導体のための協調設計ソフトウェア

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    Country：Japan

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  • President's Award

    2025.3   Yokohama National University  

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    Country：Japan

    Particularly notable achievements in academic research activities

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  • Yasujiro NIWA Outstading Paper Award

    2025.1   Tokyo Denki University  

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    Award type：Award from publisher, newspaper, foundation, etc.  Country：Japan

    High-speed, low-voltage, low-bit-energy silicon photonic crystal slow-light modulator with impedance-engineered distributed electrodes

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  • Young Engineer Award

    2024.11   IEEE MTT-S Japan Chapter  

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    Award type：International academic award (Japan or overseas)  Country：Japan

    Bandwidth Tripler: Broadband Signal Generation With an Image-Rejection Analog Multiplexer for Fiber Optic Transmitters

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  • Young Scientist Presentation Award

    2024.9   The Japan Society of Applied Physics  

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    Award type：Award from Japanese society, conference, symposium, etc.  Country：Japan

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  • Telecom System Technology Student Award

    2024.3   Telecommunications Advancement Foundation  

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    Award type：Award from publisher, newspaper, foundation, etc.  Country：Japan

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  • Best Poster Award

    2023.3   PECS-XIII  

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    Award type：Award from international society, conference, symposium, etc. 

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  • Best Poster Presentation Award

    2022.8   光通信研究会  

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    Award type：Award from Japanese society, conference, symposium, etc. 

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  • Young Researcher's Award

    2022.3   The Institute of Electronics, Information and Communication Engineers  

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    Award type：Award from Japanese society, conference, symposium, etc. 

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  • Graduate School of Science and Technology Award

    2025.3   Yokohama National University  

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    Country：Japan

    Excellent academic performance and notable achievements in academic research activities

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  • SCAT研究奨励金

    2022.4   テレコム先端技術研究支援センター   次世代光送受信器のための超広帯域電力合成技術

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  • Best Student Presentation Award

    2022.3   The Technical Committee on Microwaves, The Electronics Society, IEICE  

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    Award type：Award from Japanese society, conference, symposium, etc.  Country：Japan

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  • First prize in design category and second prize in prototype category

    2021.12   The Japan Society of Applied Science   Operational Amplifier Design Contest

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  • VDEC Design Award

    2021.9   Systems Design Lab, The University of Tokyo  

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    Award type：Award from Japanese society, conference, symposium, etc.  Country：Japan

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  • 国際交流助成

    2021.8   丸文財団  

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  • 国際会議論文発表者助成

    2021.5   NEC C&C財団  

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  • First prize in the design category

    2020.11   The Japan Society of Applied Science   Operational Amplifier Design Contest

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Research Projects

  • 次世代 AI 計算基盤を支える超高速・高集積スローライト薄膜 LN 光変調器

    2026.4 - 2027.3

    公益財団法人 GMOインターネット財団  GMO研究助成制度 

    川原 啓輔

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    Authorship：Principal investigator  Grant type：Competitive

    Grant amount：\800000

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  • 光電協調設計による電子信号処理機能の再構成と高速光送信機への応用

    2025.12 - 2026.3

    東京科学大学工学院  工学院共通経費による顕彰と研究助成  助教インセンティブ研究経費

    川原啓輔

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    Authorship：Principal investigator 

    Grant amount：\584000 （ Direct Cost: \584000 ）

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  • 光電協調設計が拓くDSP/DACレス高速光送信機

    Grant number：25K23449  2025.7 - 2027.3

    日本学術振興会  科学研究費助成事業 研究活動スタート支援

    川原 啓輔

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    Authorship：Principal investigator  Grant type：Competitive

    Grant amount：\2730000 （ Direct Cost: \2100000 、 Indirect Cost：\630000 ）

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  • 光電融合半導体のための協調設計ソフトウェア

    2025.7 - 2026.3

    東京科学大学イノベーションデザイン機構  社会変革チャレンジ賞 

    川原 啓輔

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    Authorship：Principal investigator 

    Grant amount：\1000000

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  • 集積光デバイスと電子回路を高度に融合した高速・省エネルギー光送信機の研究

    2024.4 - 2025.3

    公益財団法人 GMOインターネット財団  GMO研究助成制度 

    川原 啓輔

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    Authorship：Principal investigator 

    Grant amount：\1000000

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  • Development of a high-efficiency all-silicon optical transmitter

    Grant number：23KJ0988  2023.4 - 2025.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for JSPS Fellows

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    Grant type：Competitive

    Grant amount：\2000000 （ Direct Cost: \2000000 ）

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Other

  • Completed the Special High-Pressure Gas Handling Supervisor Training Course

    2025.10

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  • Maritime Ⅲ-Category Special Radio Operator

    2020.4

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  • On-The-Ground Ⅰ-Category Special Radio Operator

    2020.4

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Teaching Experience

  • Engineering Literacy I/II

    2026.4 Institution：Institute of Science Tokyo

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    Level：Undergraduate (specialized)  Country：Japan

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  • Electrical and Electronic Engineering Laboratory II A/B

    2025.4 Institution：Institute of Science Tokyo

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    Level：Undergraduate (specialized)  Country：Japan

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  • Laboratory Ⅰ for Electrical and Computer Engineering (TA, Topic: distributed constant circuit)

    2022.4 - 2022.9 Institution：Yokohama National University

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  • Fundamentals of Computer Science (TA)

    2021.10 - 2022.3 Institution：Tokyo University of Science

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  • Electrical Experiments 1 (TA, Topic: bridge circuit)

    2021.4 - 2021.9 Institution：Tokyo University of Science

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  • Introduction to Programming Languages (TA)

    2021.4 - 2021.9 Institution：Tokyo University of Science

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Social Activities

Media Coverage

  • 光電気等化で実現する 100 Gbaud 級 Si 光変調 Promotional material

    応用物理学会フォトニクス分科会  会誌フォトニクスニュース  第11巻第3号  2026.3

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  • VALUE POINTER Promotional material

    Support Center for Advanced Telecommunications Technology Research, General Incorporated Foundation  SCAT LINE  2023.9

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  • 研究室紹介 理工学部 楳田研究室 Promotional material

    東京理科大学こうよう会  浩洋  No. 71  2022.1

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Academic Activities

  • シリコンフォトニクス・光電融合集積・光制御セッション 座長

    Role(s)： Panel moderator, session chair, etc.

    第86回応用物理学会秋季学術講演会  2025.9

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    Type：Competition, symposium, etc. 

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  • フォトニック構造・現象、シリコンフォトニクス・光電融合集積・光制御のコードシェアセッション 座長

    Role(s)： Panel moderator, session chair, etc.

    第72回応用物理学会春季学術講演会  2025.3

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    Type：Competition, symposium, etc. 

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  • シリコンフォトニクスセッション 座長

    Role(s)： Panel moderator, session chair, etc.

    第85回応用物理学会秋季学術講演会  2024.9

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    Type：Competition, symposium, etc. 

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  • IEICE Transactions on Communications

    Role(s)： Peer review

    IEICE 

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    Type：Peer review 

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  • IEEE Journal of Selected Topics in Quantum Electronics

    Role(s)： Peer review

    IEEE 

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    Type：Peer review 

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  • Optical Materials Express

    Role(s)： Peer review

    Optica 

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    Type：Peer review 

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  • Journal of Lightwave Technology

    Role(s)： Peer review

    Optica, IEEE 

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    Type：Peer review 

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  • Applied Optics

    Role(s)： Peer review

    Optica 

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    Type：Peer review 

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  • Optics Express

    Role(s)： Peer review

    Optica 

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    Type：Peer review 

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  • IEEE Transactions on Microwave Theory and Technique

    Role(s)： Peer review

    IEEE 

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    Type：Peer review 

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  • Frontiers of Optoelectronics

    Role(s)： Peer review

    Springer 

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    Type：Peer review 

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