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J-GLOBAL ID：201401057140020605   Update date: Sep. 24, 2024

Takeshi Fujisawa

Takeshi Fujisawa
Affiliation and department：
Hosei University Faculty of Science and Engineering

About Hosei University Faculty of Science and Engineering


Research field  (1)： Optical engineering and photonics
Research keywords  (7)： Optical semiconductor devices ,  Quantum electronics ,  Optoelectronics ,  光半導体工学 ,  量子エレクトロニクス ,  光エレクトロニクス ,  Optical Communication
Research theme for competitive and other funds  (7)：
  • 2022 - 2025 Novel broadband mid-infrared emitting quantum structures fabricated by metal organic vapor phase epitaxy
  • 2021 - 2024 テラビット級光イーサネットを実現する波長、モード分割多重伝送融合光波回路の研究
  • 2020 - 2023 幾何位相を用いた螺旋ツイストフォトニック結晶ファイバによる任意光空間状態生成
  • 2018 - 2021 A research on the planar optical devices for manipulating spatial state of light for large-capacity optical communication system
  • 2016 - 2017 次世代大容量光通信システム実現に向けたモード分割多重通信用光波回路に関する研究
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Papers (198)：
  • Y. Sawada, T. Fujisawa, T. Mitarai, T. Okimoto, H. Yagi, N. Fujiwara. Compact four-channel wavelength multiplexer with two-stage mosaic-based waveguides designed by Bayesian direct binary search. Proc of OECC. 2024. TB4.1
  • Kodai Nakamura, Takeshi Fujisawa, Takanori Sato, Kunimasa Saitoh. Tunable O-band high-tolerance silicon mode multiplexer based on phase-mismatched asymmetric directional couplers. Journal of the Optical Society of America B. 2024. 41. 5. 1106-1106
  • K., Hombu, K. Hikita, T. Fujisawa, K. Maeda, M. Arai. Metalorganic Vapor-Phase Epitaxy Growth of Multilayer Stacked InAsSb/InAsP Superlattices on GaAs and InAs Substrates. Physica Status Solidi (a). 2024. 221. 2300824
  • Takayoshi Mori, Takeshi Fujisawa, Junji Sakamoto, Yoko Yamashita, Taiji Sakamoto, Ryota Imada, Ryoto Ima, Takanori Sato, Kei Watanabe, Ryoichi Kasahara, et al. Variable Mode-Dependent-Loss equalizer based on Silica-PLC for Three-Mode transmission. Optical Fiber Technology. 2023. 81
  • Takeshi Fujisawa, Takuya Mitarai, Yusuke Sawada, Takuya Okimoto, Naoya Kono, Naoki Fujiwara, Taichi Muratsubaki, Hideki Yagi. Ultrasmall Power Splitters With Triangular Lattice Mosaic Patterns Designed by Bayesian DBS Method. IEEE Photonics Technology Letters. 2023. 35. 21. 1139-1142
ｍore...
MISC (107)：
  • A proposal of low-loss and compact Si wire 90° waveguide bend using clothoid curves. 2017. 116. 388. 257-262
  • Theoretical investigation of highly efficient connecting structure between Ge-rib and GeSn waveguides and extinction characteristics of GeSn/SiGeSn multiple-quantum-well waveguide for mid-infrared photonics. 2016. 116. 274. 55-60
  • A Proposal of Broadband Mach-Zehnder Mode Multi/Demultiplexer Based on 3dB Mode Divider with Taper Waveguide. 2016. 116. 273. 97-102
  • Fabrication of PLC-based 2-mode multi/demultiplexer designed by wavefront matching method and the reason of its broadband characteristics. 2016. 116. 274. 91-96
  • A Proposal of Broadband Mach-Zehnder Mode Multi/Demultiplexer Based on 3dB Mode Divider with Taper Waveguide. 2016. 116. 274. 97-102
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Patents (32)：
  • モード合分波器
  • モード合分波器及びモード分波器の製造方法
  • マルチコアファイバ
  • マルチコアファイバ
  • マルチコアファイバ及び光ケーブル
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Lectures and oral presentations  (126)：
  • Wide wavelength range emission from InAs/GaSb type-II superlattices grown by MOVPE
    (28-th International Semiconductor Laser Conference (ISLC2022) 2022)
  • Variable mode-dependent-loss equalizer based on silica-PLC for two-LP-mode transmission
    (48th European Conference and Exhibition on Optical Communication (ECOC 2022) 2022)
  • Cascaded Wavefront-Matching-Method Designed 6-Mode-Exchangers for MDL Management in MDM Transmission
    (Conference on Lasers and Electro-Optics Pacific-Rim 2022 (CLEO-PR2022) 2022)
  • Temperature Dependence of Mid-infrared Emission Process of InAs/GaSb Superlattices Grown by MOVPE
    (Conference on Lasers and Electro-Optics Pacific-Rim 2022 (CLEO-PR2022) 2022)
  • Analysis of crosstalk dependence of cladding diameter in heterogeneous multi-core fibers by considering polarization-mode coupling effects
    (Optoelectronics and Communications Conference (OECC 2022) 2022)
ｍore...
Education (1)：
  • 2003 - 2005 Hokkaido University Graduate School of Engineering
Professional career (1)：
  • 博士(工学) (北海道大学)
Work history (3)：
  • 2024/04 - 現在 Hosei University
  • 2014/02 - 現在 Hokkaido University Graduate School of Information Science and Technology
  • 2006/04 - 2014/01 NTTフォトニクス研究所
Committee career (22)：
  • 2020/08 - 現在 Associate Editor of IEEE/OSA Journal of Lightwave Technology
  • 2020/06 - 現在 電子情報通信学会 光エレクトロニクス研究会専門委員
  • 2015/04 - 現在 電子情報通信学会 レーザ・量子エレクトロニクス研究会専門委員
  • 2024/06 - 2025/05 電子情報通信学会 光エレクトロニクス研究会 幹事
  • 2024 - 2025 Technical Program Committee, Category O4:Optical Active Devices and Modules, 30th Optoelectronics and Communications Conference/ International Conference on Photonics in Switching and Computing 2025 (OECC/PSC 2025)
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Association Membership(s) (3)：
Optical Society of America ,  THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS ,  IEEE
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