Takeshi Fujisawa

Affiliation and department：

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

Show all

Papers (173)：

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
Zheyu Zhao, Takanori Sato, Takeshi Fujisawa, Taro Iwaya, Yuto Sagae, Taiji Sakamoto, Takashi Matsui, Kazuhide Nakajima, Kunimasa Saitoh. Investigation of double-cladding heterogeneous step-index 2LP-mode multicore fiber with a two-ring layout. Journal of the Optical Society of America B: Optical Physics. 2023. 40. 10. 2511-2518
Takeshi Fujisawa, Takuya Mitarai, Takuya Okimoto, Naoya Kono, Naoki Fujiwara, Takanori Sato, Hideki Yagi, Kunimasa Saitoh. Bayesian design of mosaic-based mode multiplexers for various wavelength bands. Optics Express. 2023. 31. 16. 26842-26842
Takanori Sato, Takeshi Fujisawa, Masaki Wada, Takayoshi Mori, Taiji Sakamoto, Ryota Imada, Takashi Matsui, Kazuhide Nakajima, Kunimasa Saitoh. Design of silica-PLC LP11 mode rotator based on adiabatic mode conversion. Optics Express. 2023. 31. 15. 23910-23922

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

ｍore...

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

ｍore...

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 (17)：

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
2021 - 2022 Technical program committee, Integrated Photonics Applications Subcommittee, Integrated Photonics Research (IPR), Silicon and Nanophotonics, in 2022 OSA Advanced Photonic Congress

Show all

Association Membership(s) (3)：

Optical Society of America , THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS , IEEE

※ Researcher’s information displayed in J-GLOBAL is based on the information registered in researchmap. For details, see here.

Return to Previous Page