Takeshi Fujisawa

42 papers A 1Journal 8Unranked 33

Year	Rank	Type	Title / Venue / Authors
2025	—	`conf`	Scalable Multi-Band Narrow Linewidth Operation by a Single-Chip Tunable Laser with InP/Si Heterogeneous Integration. ECOC Takuo Hiratani, Kento Komatsu, Hidenari Fujikata, Naoki Fujiwara, Naoko Inoue, Takehiko Kikuchi, Takuya Mitarai, Shun Kimura, Takuya Okimoto, Yusuke Sawada, Eiichi Banno, Takashi Matsui, Takeshi Fujisawa, Nobuhiko Nishiyama, Hideki Yagi
2025	—	`conf`	Ultrasmall Mode Exchangers Based on Mosaic Structure Designed by Gradient Direct Binary Search Method. ECOC Takeshi Fujisawa, Yasuhide Tsuji, Takuya Mitarai, Yusuke Sawada, Takuya Okimoto, Takuo Hiratani, K. Komatsu, Hideki Yagi, Naoki Fujiwara
2023	J	`jnl`	Design of PLC E IEICE Electron. Express Han Wang, Takeshi Fujisawa, Takanori Sato, Masaki Wada, Takayoshi Mori, Taiji Sakamoto, Ryota Imada, Takashi Matsui, Kazuhide Nakajima, Kunimasa Saitoh
2023	—	`conf`	Fabrication-tolerant, 2-mode, 4λ multiplexer based on Si waveguides for beyond Tbit/s optical Ethernet. OFC Takeshi Fujisawa, Kunimasa Saitoh
2023	—	`conf`	Prototype of Visualization System for Discussion in Project-Based Learning Toward Education DX. ICEED Tadakazu Sakakura, Takeshi Fujisawa
2023	—	`conf`	Relationship between Polarization Mode Dispersion and Crosstalk in Heterogeneous Multi-core Fibers with Different Cladding Diameters. OFC Gustavo Ocampo, Takanori Sato, Takeshi Fujisawa, Mayu Nakagawa, Kunimasa Saitoh
2022	—	`conf`	Analysis of Crosstalk Dependence on Cladding Diameter in Heterogeneous Multi-core Fibers by Considering Polarization-mode Coupling Effects. OECC/PSC Gustavo Ocampo, Takanori Sato, Takeshi Fujisawa, Yoshimichi Amma, Kunimasa Saitoh
2022	—	`conf`	Compact Power Splitters with Mosaic-based Structure Designed by Bayesian Direct-binary-search Method. OECC/PSC Takuya Mitarai, Takeshi Fujisawa, Takuya Okimoto, Naoya Kono, Naoki Fujiwara, Yusuke Sawada, Taichi Muratsubaki, Takanori Sato, Kunimasa Saitoh, Hideki Yagi
2022	—	`conf`	Silica-PLC based mode-dependent-loss equalizer for two LP mode transmission. OFC Takeshi Fujisawa, Takayoshi Mori, Junji Sakamoto, Yoko Yamashita, Taiji Sakamoto, Ryota Imada, Ryoto Ima, Takanori Sato, Kei Watanabe, Ryoichi Kasahara, Toshikazu Hashimoto, Kazuhide Nakajima, Kunimasa Saitoh
2021	—	`conf`	Experimental Demonstration of Broadband Silicon 4-Mode (de)Multiplexer Designed by Wavefront-Matching Method. OFC Yusuke Sawada, Takeshi Fujisawa, Takanori Sato, Kunimasa Saitoh
2021	J	`jnl`	High-tolerance CWDM4 wavelength multiplexer based on 2×2/2×1 MZ filters with polarization multiplexing. IEICE Electron. Express Kodai Nakamura, Takeshi Fujisawa, Takanori Sato, Kunimasa Saitoh
2020	—	`conf`	A Tunable Mode Divider Based on Wavelength Insensitive Coupler using Thermo-Optic Effect for Gain-Equalization in MDM Network. OFC Kodai Nakamura, Takeshi Fujisawa, Taiji Sakamoto, Takashi Matsui, Kazuhide Nakajima, Kunimasa Saitoh
2020	—	`conf`	Low-Loss Silicon 2 × 4λ Multiplexers Composed of On-Chip Polarization-Splitter-Rotator and 2 × 2 and 2 × 1 Mach-Zehnder Filters for 400GbE. OFC Junya Takano, Takeshi Fujisawa, Yusuke Sawada, Kunimasa Saitoh
2020	—	`conf`	Modal Amplitude and Phase Estimation of NFP of Six-Mode FMF Based on Artificial Neural Network with the Help of Grey-Wolf-Optimizer. ECOC Naoto Sugawara, Takeshi Fujisawa, Kodai Nakamura, Yusuke Sawada, Taiji Sakamoto, Takashi Matsui, Kazuhide Nakajima, Kunimasa Saitoh
2020	—	`conf`	Wavefront-Matching-Method-Designed Six-Mode-Exchanger Based on Grating-Like Waveguide on Silica-PLC Platform. OFC Takeshi Fujisawa, Taiji Sakamoto, Masashi Miyata, Takashi Matsui, Toshikazu Hashimoto, Ryoichi Kasahara, Kazuhide Nakajima, Kunimasa Saitoh
2019	—	`conf`	3-Mode PLC-Based Mode Dependent Loss Equalizer in MDM Transmission. OECC/PSC Naoto Sugawara, Misa Kudo, Takeshi Fujisawa, Taiji Sakamoto, Takashi Matsui, Kyozo Tsujikawa, Kazuhide Nakajima, Kunimasa Saitoh
2019	—	`conf`	A Broadband Mode Divider with Arbitrary Branching Ratio Based on Wavelength-Insensitive Coupler. OFC Misa Kudo, Takeshi Fujisawa, Taiji Sakamoto, Takashi Matsui, Kyozo Tsujikawa, Kazuhide Nakajima, Kunimasa Saitoh
2019	—	`conf`	A Design of Low MDL Scrambling-type PLC 6-mode Multiplexer. OECC/PSC Motoki Shirata, Misa Kudo, Takeshi Fujisawa, Taiji Sakamoto, Takashi Matsui, Kyozo Tsujikawa, Kazuhide Nakajima, Kunimasa Saitoh
2019	J	`jnl`	CMOS-compatible Si-wire polarization beam splitter based on wavelength-insensitive coupler. IEICE Electron. Express Yusuke Sawada, Takeshi Fujisawa, Takanori Sato, Kunimasa Saitoh
2019	—	`conf`	Cladding Diameter Dependence of Inter-Core Crosstalk in Heterogeneous Multicore Fibers. OECC/PSC Kenta Nishimura, Takanori Sato, Takeshi Fujisawa, Yoshimichi Amma, Katsuhiro Takenaga, Kazuhiko Aikawa, Kunimasa Saitoh
2019	—	`conf`	First Experimental Demonstration of Wavefront-Matching-Method-Designed Silicon Mode Converters. OFC Yusuke Sawada, Takeshi Fujisawa, Takanori Sato, Kunimasa Saitoh
2019	—	`conf`	Low-Loss and Fabrication-Tolerant Si Four-Wavelength Multiplexer using Higher-Order Mode for 100/400GbE. OFC Junya Takano, Takeshi Fujisawa, Takanori Sato, Yusuke Sawada, Taiji Sakamoto, Takashi Matsui, Kyozo Tsujikawa, Kazuhide Nakajima, Kunimasa Saitoh
2019	—	`conf`	Ultra-Robust Design of Mode (De)Multiplexer Based on Asymmetrical Directional Coupler Using Wire and One-Side Rib Waveguides. OECC/PSC Takanori Sato, Takeshi Fujisawa, Kunimasa Saitoh
2018	J	`jnl`	A Review of PLC-Based Broadband Two-Mode Multi/Demultiplexer Designed by Wavefront Matching Method. IEICE Trans. Electron. Eri Taguchi, Takeshi Fujisawa, Yoko Yamashita, Shuntaro Makino, Nobutomo Hanzawa, Taiji Sakamoto, Takashi Matsui, Kyozo Tsujikawa, Kazuhide Nakajima, Fumihiko Yamamoto, Kunimasa Saitoh
2018	—	`conf`	Digital teaching materials of Kosen fundamental mathematics for Bilingual Engineering Education. ICEED Tadakazu Sakakura, Norihisa Matsumoto, Akiko Nakatani, Takeshi Fujisawa
2017	J	`jnl`	A photonic-plasmonic mode converter using mode-coupling-based polarization rotation for metal-inserted silicon platform. IEICE Electron. Express Yuhei Ishizaka, Masaru Nagai, Takeshi Fujisawa, Kunimasa Saitoh
2017	—	`conf`	Group Delay Spread Analysis of Few-Mode, Coupled 3-Core Fibres: Optimum Index Profile and Maximum Transmission Distance for Strong Coupling Regime. ECOC Kazuki Yoshida, Takeshi Fujisawa, Takanori Sato, Kunimasa Saitoh
2017	—	`conf`	Mach-Zehnder Mode/Wavelength (De)Multiplexer for WDM/MDM Optical Transmission. ECOC Shun Ohta, Takeshi Fujisawa, Shuntaro Makino, Taiji Sakamoto, Takashi Matsui, Kyozo Tsujikawa, Kazuhide Nakajima, Kunimasa Saitoh
2017	—	`conf`	One chip, PLC three-mode exchanger based on symmetric and asymmetric directional couplers with integrated mode rotator. OFC Takeshi Fujisawa, Eri Taguchi, Taiji Sakamoto, Takashi Matsui, Yoko Yamashita, Kyozo Tsujikawa, Kazuhide Nakajima, Kunimasa Saitoh
2017	—	`conf`	Scrambling-type three-mode multiplexer based on cascaded Y-branch waveguide with integrated mode rotator on PLC platform. OFC Takeshi Fujisawa, Yoko Yamashita, Taiji Sakamoto, Takashi Matsui, Shuntaro Makino, Kyozo Tsujikawa, Kazuhide Nakajima, Kunimasa Saitoh
2017	—	`conf`	Ultimately low-loss and compact Si wire 90° waveguide bend composed of clothoid and normal curves for dense optical interconnect PICs. OFC Shuntaro Makino, Masahiro Suga, Takanori Sato, Takeshi Fujisawa, Kunimasa Saitoh
2016	—	`conf`	56-Gbaud 4-PAM (112-Gbit/s) operation of flip-chip interconnection lumped-electrode EADFB laser module for equalizer-free transmission. OFC Shigeru Kanazawa, Takeshi Fujisawa, Kiyoto Takahata, Yasuhiko Nakanishi, Hiroshi Yamazaki, Yuta Ueda, Wataru Kobayashi, Yoshifumi Muramoto, Hiroyuki Ishii, Hiroaki Sanjoh
2016	—	`conf`	Extremely small group delay spread six-core fiber with air-holes for mode-division-multiplexing: A principal mode analysis. OFC Takeshi Fujisawa, Ren Tojo, Shota Saitoh, Shoichiro Matsuo, Kunimasa Saitoh
2016	—	`conf`	Transmission of 214-Gbit/s 4-PAM signal using an ultra-broadband lumped-electrode EADFB laser module. OFC Shigeru Kanazawa, Hiroshi Yamazaki, Yasuhiko Nakanishi, Takeshi Fujisawa, Kiyoto Takahata, Yuta Ueda, Wataru Kobayashi, Yoshifumi Muramoto, Hiroyuki Ishii, Hiroaki Sanjoh
2015	—	`conf`	400-Gb/s operation of flip-chip interconnection EADFB laser array module. OFC Shigeru Kanazawa, Takeshi Fujisawa, Kiyoto Takahata, Hiroaki Sanjoh, Ryuzo Iga, Yuta Ueda, Wataru Kobayashi, Hiroyuki Ishii
2015	—	`conf`	A principal mode analysis of strongly-coupled 3-core fibres. ECOC Takeshi Fujisawa, Kunimasa Saitoh
2015	—	`conf`	Demonstration of PLC-based six-mode multiplexer for mode division multiplexing transmission. ECOC Nobutomo Hanzawa, Kunimasa Saitoh, Taiji Sakamoto, Takashi Matsui, Kyozo Tsujikawa, Takeshi Fujisawa, Yuhei Ishizaka, Fumihiko Yamamoto
2014	—	`conf`	40-Gbit/s EADFB laser integrated with short cavity SOA improving chirp characteristics with low power consumption. ECOC Wataru Kobayashi, M. Arai, Takeshi Fujisawa, Y. Shibata, Tomonari Sato, Toshio Ito, Koichi Hasebe, Takayuki Yamanaka, Hiroaki Sanjoh
2011	J	`jnl`	Long-Reach 100 Gbit Ethernet Light Source Based on 4×25-Gbit/s 1.3-µm InGaAlAs EADFB Lasers. IEICE Trans. Electron. Takeshi Fujisawa, Kiyoto Takahata, Takashi Tadokoro, Wataru Kobayashi, Akira Ohki, Naoki Fujiwara, Shigeru Kanazawa, Takayuki Yamanaka, Fumiyoshi Kano
2011	J	`jnl`	Wide-bandwidth, low-waveguide-width-sensitivity InP-based multimode interference coupler designed by wavefront matching method. IEICE Electron. Express Takeshi Fujisawa, Tsutomu Kitoh, Kei Watanabe, Kenya Suzuki, Masaki Kotoku, Hiroshi Takahashi
2006	J	`jnl`	Transmission characteristics of laterally illuminated photonic crystal fibers. IEICE Electron. Express Keiichi Morikawa, Takeshi Fujisawa, Kunimasa Saitoh, Masanori Koshiba
2003	A	`conf`	Evaluation of the affect of speech intonation using a model of the perception of interval dissonance and harmonic tension. INTERSPEECH Norman D. Cook, Takeshi Fujisawa, Kazuaki Takami