Photonic crystal slow light devices fabricated by CMOS-compatible process. - Toshihiko Baba; Hong C. Nguyen; Norihiro Ishikura; Keijiro Suzuki; Mizuki Shinkawa; Ryo Hayakawa; Keisuke Kondo (IEICE Electron. Express, 2013)

First demonstration of ultra-low-energy hierarchical multi-granular optical path network dynamically controlled through NSI-CS for video related applications. - Junya Kurumida; Kiyo Ishii; Atsuko Takefusa; Yusuke Tanimura; Shigeyuki Yanagimachi; Hitoshi Takeshita; Akio Tajima; Kiyoshi Fukuchi; H. Honma; W. Odashima; Hiroshi Onaka; Ken Tanizawa; et al. (ECOC, 2014)

Robust design of 3-dB directional coupler with weak gap sensitivity for silicon wire waveguide. - Guangwei Cong; Keijiro Suzuki; Sang-Hun Kim; Ken Tanizawa; Shu Namiki; Hitoshi Kawashima (OFC, 2014)

Multiport optical switches integrated on Si photonics platform. - Keijiro Suzuki; Guangwei Cong; Ken Tanizawa; Sang-Hun Kim; Kazuhiro Ikeda; Shu Namiki; Hitoshi Kawashima (IEICE Electron. Express, 2014)

In-band OSNR monitor based on 3 × 3 Si-wire MMI coupler. - Ken Tanizawa; Keisuke Sorimoto; Keijiro Suzuki; Kazuhiro Ikeda; Shu Namiki; Hitoshi Kawashima (ECOC, 2015)

Power-efficient gray-scale control of silicon thermo-optic phase shifters by pulse width modulation using monolithically integrated MOSFET. - Guangwei Cong; Takashi Matsukawa; Keijiro Suzuki; Ken Tanizawa; Sang-Hun Kim; Tadashi Chiba; Hirofumi Tadokoro; Masashi Yanagihara; Morifumi Ohno; Haruhiko Kuwatsuka; Yasushi Igarashi; Meishoku Masahara; et al. (OFC, 2015)

32×32 strictly non-blocking Si-wire optical switch on ultra-small die of 11×25 mm2. - Ken Tanizawa; Keijiro Suzuki; Munehiro Toyama; Minoru Ohtsuka; Nobuyuki Yokoyama; Kazuyuki Matsumaro; Miyoshi Seki; Keiji Koshino; Toshio Sugaya; Satoshi Suda; Guangwei Cong; Toshio Kimura; et al. (OFC, 2015)

Evaluation of the phase error in Si-wire arrayed-waveguide gratings fabricated by ArF-immersion photolithography. - Kyosuke Muramatsu; Hideaki Asakura; Keijiro Suzuki; Ken Tanizawa; Munehiro Toyama; Minoru Ohtsuka; Nobuyuki Yokoyama; Kazuyuki Matsumaro; Miyoshi Seki; Keiji Koshino; Kazuhiro Ikeda; Shu Namiki; et al. (IEICE Electron. Express, 2015)

Multi-port optical switch based on silicon photonics. - Hitoshi Kawashima; Keijiro Suzuki; Ken Tanizawa; Satoshi Suda; Guangwei Cong; Hiroyuki Matsuura; Shu Namiki; Kazuhiro Ikeda (OFC, 2016)

In-line optical amplification for Si waveguides on 1×8 splitter and selector by flip-chip bonded InP-SOAs. - Takeshi Matsumoto; Teruo Kurahashi; Ken Tanizawa; Keijiro Suzuki; Ayahito Uetake; Kazumasa Takabayashi; Kazuhiro Ikeda; Hitoshi Kawashima; Suguru Akiyama (OFC, 2016)

Novel PILOSS port assignment for compact polarization-diversity Si-wire optical switch. - Ken Tanizawa; Keijiro Suzuki; Kazuhiro Ikeda; Shu Namiki; Hitoshi Kawashima (OFC, 2016)

2.5-dB loss, 100-nm Operating Bandwidth, and Low Power Consumption Strictly-Non-Blocking 8 × 8 Si Switch. - Keijiro Suzuki; Ken Tanizawa; Satoshi Suda; Hiroyuki Matsuura; Kazuhiro Ikeda; Shu Namiki; Hitoshi Kawashima (ECOC, 2017)

Accelerating switching speed of thermo-optic MZI silicon-photonic switches with "turbo pulse" in PWM control. - Hiroyuki Matsuura; Satoshi Suda; Ken Tanizawa; Keijiro Suzuki; Kazuhiro Ikeda; Hitoshi Kawashima; Shu Namiki (OFC, 2017)

Silicon-photonics polarization-insensitive broadband strictly-non-blocking 8 × 8 blade switch. - Keijiro Suzuki; Ken Tanizawa; Satoshi Suda; Hiroyuki Matsuura; Takashi Inoue; Kazuhiro Ikeda; Shu Namiki; Hitoshi Kawashima (OFC, 2017)

Fully integrated non-duplicate polarization-diversity 8 × 8 Si-wire PILOSS switch. - Ken Tanizawa; Keijiro Suzuki; Kazuhiro Ikeda; Shu Namiki; Hitoshi Kawashima (OFC, 2017)

Polarization diversity circuit based on silica waveguides and photonic crystal waveplates for a 4×4 silicon optical switch. - Koki Sugiyama; Takafumi Chiba; Ken Tanizawa; Keijiro Suzuki; Takayuki Kawashima; Shojiro Kawakami; Kazuhiro Ikeda; Hitoshi Kawashima; Hiroshi Takahashi; Hiroyuki Tsuda (IEICE Electron. Express, 2017)

Ultra-Compact Silicon Photonics Switch with Ultra-Dense Thermo-Optic MZI Matrix and Multi-Layer Wiring. - Ryotaro Konoike; Keijiro Suzuki; Shu Namiki; Hitoshi Kawashima; Kazuhiro Ikeda (ECOC, 2018)

Fast Optical Circuit Switch Using Monolithically Integrated Silicon-Photonic Space Switch and Wavelength-Tuneable Filter. - Yojiro Mori; Mungun-Erdene Ganbold; Ryuta Shiraki; Keijiro Suzuki; Hiroyuki Matsuura; Hitoshi Kawashima; Shu Namiki; Kazuhiro Ikeda; Ken-ichi Sato (ECOC, 2018)

32-Port 5.5%-Δ Silica-Based Connecting Device for Low-Loss Coupling between SMFs and Silicon Waveguides. - Junichi Hasegawa; Kazuhiro Ikeda; Keijiro Suzuki; Shintaro Yamasaki; Go Kobayashi; Masanori Takahashi; Hitoshi Kawashima (OFC, 2018)

Lossless Operation of SOA-Integrated Silicon Photonics Switch for 8 × 32-Gbaud 16-QAM WDM Signals. - Ryotaro Konoike; Keijiro Suzuki; Takashi Inoue; Takeshi Matsumoto; Teruo Kurahashi; Ayahito Uetake; Kazumasa Takabayashi; Suguru Akiyama; Shigeaki Sekiguchi; Kazuhiro Ikeda; Shu Namiki; Hitoshi Kawashima (OFC, 2018)

Fully-Loaded and Cascaded Operation of Polarization-Diversity 8 × 8 Silicon Photonics Optical Switch with 11-ch × 32/44-Gbaud DP-16QAM WDM Transmission. - Takayuki Kurosu; Takashi Inoue; Keijiro Suzuki; Satoshi Suda; Shu Namiki (OFC, 2018)

In-line Optical Amplification for Silicon Photonics Platform by Flip-Chip Bonded InP-SOAs. - Takeshi Matsumoto; Teruo Kurahashi; Ryotaro Konoike; Ken Tanizawa; Keijiro Suzuki; Ayahito Uetake; Kazumasa Takabayashi; Kazuhiro Ikeda; Hitoshi Kawashima; Suguru Akiyama; Shigeaki Sekiguchi (OFC, 2018)

Fast Frequency Tuning of Silicon-Photonic Thermo-optic MZI Filters using "Turbo Pulse" Method. - Hiroyuki Matsuura; Keijiro Suzuki; Satoshi Suda; Kazuhiro Ikeda; Hitoshi Kawashima; Shu Namiki (OFC, 2018)

Next-Generation ROADM Employing Bandwidth-Adaptive Silicon-Photonic Filters for Flexible Drop Operation. - Yojiro Mori; Koh Ueda; Keijiro Suzuki; Hiroyuki Matsuura; Ken Tanizawa; Kazuhiro Ikeda; Shu Namiki; Hitoshi Kawashiwa; Ken-ichi Sato (OFC, 2018)

Low Insertion Loss and Power Efficient 32 × 32 Silicon Photonics Switch with Extremely-High-Δ PLC Connector. - Keijiro Suzuki; Ryotaro Konoike; Junichi Hasegawa; Satoshi Suda; Hiroyuki Matsuura; Kazuhiro Ikeda; Shu Namiki; Hitoshi Kawashima (OFC, 2018)

Reconfigurable 3-Channel All-Optical MIMO Circuit on Silicon Based on Multi-Plane Light Conversion. - Rui Tang; Takuo Tanemura; Samir Ghosh; Keijiro Suzuki; Ken Tanizawa; Kazuhiro Ikeda; Hitoshi Kawashima; Yoshiaki Nakano (OFC, 2018)

Silicon photonics based 1 × 2 wavelength selective switch using fold-back arrayed-waveguide gratings. - Fumi Nakamura; Hideaki Asakura; Keijiro Suzuki; Ken Tanizawa; Minoru Ohtsuka; Nobuyuki Yokoyama; Kazuyuki Matsumaro; Miyoshi Seki; Keiji Koshino; Kazuhiro Ikeda; Shu Namiki; Hitoshi Kawashima; et al. (IEICE Electron. Express, 2018)

A 300-mm-wafer silicon photonics technology for advanced information systems. - Koji Yamada; Guangwei Cong; Makoto Okano; Yuriko Maegami; Morifumi Ohno; Keijiro Suzuki; Satoshi Suda; Ryotaro Konoike; Kazuhiro Ikeda; Hitoshi Kawashima; Tsuyoshi Horikawa; Shu Namiki; et al. (ISDCS, 2019)

Low-Loss, Low-Crosstalk, and Large-Scale Silicon Photonics Switch. - Keijiro Suzuki; Ryotaro Konoike; Satoshi Suda; Hiroyuki Matsuura; Shu Namiki; Hitoshi Kawashima; Kazuhiro Ikeda (OFC, 2019)

Polarization-Diversity 32 × 32 Si Photonics Switch with Non-Duplicate Diversity Circuit in Double-Layer Platform. - Keijiro Suzuki; Ryotaro Konoike; Nobuyuki Yokoyama; Miyoshi Seki; Minoru Ohtsuka; Shigeru Saitoh; Satoshi Suda; Hiroyuki Matsuura; Koji Yamada; Shu Namiki; Hitoshi Kawashima; Kazuhiro Ikeda (OFC, 2019)

Low-Crosstalk Bandwidth Expansion in $32 times 32$ Silicon Optical Switch with Port-Exchanged Mach-Zehnder Switch. - Keijiro Suzuki; Ryotaro Konoike; Satoshi Suda; Hiroyuki Matsuura; Shu Namiki; Hitoshi Kawashima; Kazuhiro Ikeda (OECC/PSC, 2019)

Polarization-insensitive low-crosstalk 8×8 silicon photonics switch with 9×13.5 cm2 control board. - Ryotaro Konoike; Hiroyuki Matsuura; Keijiro Suzuki; H. Kawashima; Kazuhiro Ikeda (ECOC, 2020)

Large-Scale and Fast Optical Circuit Switch for Coherent Detection Using Tunable Local Oscillators Formed with Wavelength Bank and Widely-Tunable Silicon Ring Filters. - Ryosuke Matsumoto; Ryotaro Konoike; Hiroyuki Matsuura; Keijiro Suzuki; Takashi Inoue; Yojiro Mori; Kazuhiro Ikeda; Shu Namiki; Ken-ichi Sato (ECOC, 2020)

5.7-dB Fiber-to-Fiber Loss 8 × 8 Silicon Photonics Switch with Port-Alternated Switch-and-Select Architecture. - Ryotaro Konoike; Keijiro Suzuki; Hitoshi Kawashima; Kazuhiro Ikeda (OFC, 2020)

Scalable and Fast Optical Circuit Switch Created with Silicon-Photonic Tunable-Filter-Based Local Oscillator Bank and Colorless Coherent Detection. - Ryosuke Matsumoto; Takashi Inoue; Ryotaro Konoike; Hiroyuki Matsuura; Keijiro Suzuki; Yojiro Mori; Kazuhiro Ikeda; Shu Namiki; Ken-ichi Sato (OFC, 2020)

O-Band Strictly Non-Blocking 8 × 8 Silicon-Photonics Switch. - Keijiro Suzuki; Ryotaro Konoike; Guangwei Cong; Koji Yamada; Shu Namiki; Hitoshi Kawashima; Kazuhiro Ikeda (OFC, 2020)

Strictly Non-Blocking Silicon Photonics Switches. - Keijiro Suzuki; Ryotaro Konoike; Satoshi Suda; Hiroyuki Matsuura; Shu Namiki; Hitoshi Kawashima; Kazuhiro Ikeda (IEICE Trans. Electron., 2020)

5.5%-Δ-PLC/Silicon Photonics Hybrid Wavelength MUX/DEMUX-and-Switch Device. - Kazuhiro Ikeda; Noritaka Matsubara; Junichi Hasegawa; Ryotaro Konoike; Hiroyuki Matsuura; Keijiro Suzuki; Hitoshi Kawashima (OFC, 2021)

Fast Optical Switch Utilizing Coherent Detection Enabled by Cooperative Filtering of Transmission Signal and Local Oscillator (LO) Wavelength Sourced from an LO Bank. - Ryosuke Matsumoto; Ryotaro Konoike; Hiroyuki Matsuura; Keijiro Suzuki; Takashi Inoue; Kazuhiro Ikeda; Shu Namiki; Ken-ichi Sato (OFC, 2021)

Fully-Loaded Operation of 0.29-pJ/bit Wall-plug Efficiency, 81.9-Tb/s Throughput 32 × 32 Silicon Photonics Switch. - Ryosuke Matsumoto; Ryotaro Konoike; Keijiro Suzuki; Hiroyuki Matsuura; Kazuhiro Ikeda; Takashi Inoue; Shu Namiki (OFC, 2021)

Path-Independent Insertion-Loss (PILOSS) 8 × 8 Silicon Photonics Switch with <8 nsec Switching Time. - Ryotaro Konoike; Keijiro Suzuki; Kazuhiro Ikeda (OFC, 2022)

Scalable and Fast Optical Circuit Switch Exploiting Colorless Coherent Detection. - Ryosuke Matsumoto; Ryotaro Konoike; Keijiro Suzuki; Takashi Inoue; Shu Namiki; Ken-ichi Sato (OFC, 2022)

Recent Advances in Large-scale Optical Switches Based on Silicon Photonics. - Keijiro Suzuki; Ryotaro Konoike; Hiroyuki Matsuura; Ryosuke Matsumoto; Takashi Inoue; Shu Namiki; Hitoshi Kawashima; Kazuhiro Ikeda (OFC, 2022)

Demonstration of Port-Selective Beam Scanner Incorporating Silicon Vertically Curved Waveguide Antenna Arrays. - Yuki Atsumi; Tomoya Yoshida; Ryosuke Matsumoto; Ryotaro Konoike; Youichi Sakakibara; Takashi Inoue; Keijiro Suzuki (OECC/PSC, 2022)

Progress and Future Prospect of Silicon Photonics Based Large Scale Optical Switches. - Kazuhiro Ikeda; Keijiro Suzuki; Ryotaro Konoike; Shu Namiki; Hitoshi Kawashima (OECC/PSC, 2022)

Fully-loaded 32×32 silicon thermo-optic switches for disaggregated computing. - Ryosuke Matsumoto; Ryotaro Konoike; Keijiro Suzuki; Hiroyuki Matsuura; Kazuhiro Ikeda; Takashi Inoue; Shu Namiki (OECC/PSC, 2022)

Prospects and challenges of optical switching technologies for intra data center networks. - Ken-ichi Sato; Hiroyuki Matsuura; Ryotaro Konoike; Keijiro Suzuki; Kazuhiro Ikeda; Shu Namiki (JOCN, 2022)

Free-Space Signal Transmission Using Optical Beam Scanning Device Incorporating Broadband Silicon Surface Optical Couplers. - Yuki Atsumi; Tomoya Yoshida; Ryosuke Matsumoto; Ryotaro Konoike; Youichi Sakakibara; Takashi Inoue; Keijiro Suzuki (OFC, 2023)

Fast (<9.4 μs) Full-C-Band Tuning of Silicon Photonics Double-Ring Filters using Feed-Forward Control. - Ryotaro Konoike; Hiroyuki Matsuura; Keijiro Suzuki; Ryosuke Matsumoto; Kazuhiro Ikeda; Ken-ichi Sato (OFC, 2023)

Performance Verification of 7, 424 × 7, 424 Optical Switch Offering 1.4 μs Switching Time. - Ryosuke Matsumoto; Ryotaro Konoike; Hiroyuki Matsuura; Keijiro Suzuki; Takashi Inoue; Kazuhiro Ikeda; Shu Namiki; Ken-ichi Sato (OFC, 2023)

Core-to-Core Switching Module for 4-Core MCFs Using Silicon Photonics Matrix Switch Incorporating Silicon Vertically Curved Optical Coupler. - Tomoya Yoshida; Yuki Atsumi; Emiko Omoda; Katsuya Kito; Katsuhiro Iwasaki; Yusuke Kinoshita; Tomoaki Kiriyama; Ryotaro Konoike; Keijiro Suzuki; Ryosuke Matsumoto; Takashi Inoue; Kazuhiro Ikeda; et al. (OFC, 2023)

Metropolitan Area Network Model Design Using Regional Railways Information for Beyond 5G Research. - Takuji Tachibana; Yusuke Hirota; Keijiro Suzuki; Takehiro Tsuritani; Hiroshi Hasegawa (IEICE Trans. Commun., 2023)

Broadband Port-Selective Silicon Beam Scanning Device for Free-Space Optical Communication. - Yuki Atsumi; Tomoya Yoshida; Ryosuke Matsumoto; Ryotaro Konoike; Youichi Sakakibara; Takashi Inoue; Keijiro Suzuki (IEICE Trans. Electron., 2023)

Reinforced Q-Learning Enabled Automatic Blind Working Wavelength Alignment Against Wide Input-Wavelength Shifts and Temperature Variations for Silicon Photonic Vernier Ring Filters. - Guangwei Cong; Ryotaro Konoike; Keijiro Suzuki; Noritsugu Yamamoto; Rai Kou; Yuriko Maegami; Morifumi Ohno; Kazuhiro Ikeda; Shu Namiki; Koji Yamada (OFC, 2024)

Monolithic Silicon Photonic Few-mode Waveguide with Satellite Structures for Athermal Spectral Filtering. - Ryotaro Konoike; Takayuki Kurosu; Guangwei Cong; Keijiro Suzuki; Kazuhiro Ikeda; Shu Namiki (OFC, 2024)

Cost-effective ROADM Using Wide-bandwidth Silicon Tunable Ring Filter for Drop Operation. - Ryosuke Matsumoto; Ryotaro Konoike; Hiroyuki Matsuura; Keijiro Suzuki; Takashi Inoue; Kazuhiro Ikeda; Shu Namiki; Ken-ichi Sato (OFC, 2024)

Input and Output Port-Adjacent Silicon Photonics PILOSS Switch for Wafer-Scale Optical Interconnections. - Siim Heinsalu; Ryotaro Konoike; Keijiro Suzuki; Kazuhiro Ikeda (OFC, 2025)

Full C-band Two-Dimensional Beam-Steering Silicon PIC and 15.36-Tbit/s Free-Space Optical Transmission. - Tomoya Yoshida; Takashi Inoue; Yuki Atsumi; Ryosuke Matsumoto; Ryotaro Konoike; Kazuhiro Ikeda; Keijiro Suzuki (OFC, 2025)