High-speed optical switching of InAlGaAs/InAlAs multi-mode interference photonic switch with partial index-modulation region (MIPS-P). - Shingo Kumai; Tomohiro Ishikawa; Atsuki Okazaki; Katsuyuki Utaka; Hidetaka Amanai; Kaori Kurihara; Kenji Shimoyama (IEICE Electron. Express, 2005)

Study on Tapered Multimode Interference-Based Coherent Lightwave Combiners. - Zhigang Wu; Katsuyuki Utaka (IEICE Trans. Electron., 2005)

High-speed and compact non-blocking 8×8 InAlGaAs/InAlAs Mach-Zehnder-type optical switch fabric. - Hiroki Kouketsu; Shoko Kawasaki; Noriaki Koyama; Aki Takei; Takafumi Taniguchi; Yuichi Matsushima; Katsuyuki Utaka (OFC, 2014)

Simultaneous High-speed and Polarization-Independent Switching Operation of 2x2 Silicon Mach-Zehnder-Type Optical Switch. - Kana Shimizu; Tomohiro Shirai; Yuichi Matsushima; Hiroshi Ishikawa; Katsuyuki Utaka (PSC, 2018)

Optimization of suspended ladder BG silicon sensors for high wavelength or amplitude sensitivity. - Siim Heinsalu; Yuichi Matsushima; Hiroshi Ishikawa; Katsuyuki Utaka (IEEE SENSORS, 2021)

Sensitivity improvement for silicon MS-SW BG sensors by waveguide height increase or by waveguide suspension with supporting shape modification. - Siim Heinsalu; Anna Kawano; Yuji Isogai; Yuichi Matsushima; Hiroshi Ishikawa; Katsuyuki Utaka (OFC, 2021)

Low-loss optical coupling between polymer single-mode waveguide and single-mode fiber using 45° mirror. - Ryo Kuwata; Qin Su; Hirotaka Oshima; Yuichi Matsushima; Hiroshi Ishikawa; Katsuyuki Utaka (OECC/PSC, 2022)

Sensitivity Improvement of Multi-Slot Subwavelength Bragg Grating Refractive Index Sensors by Increasing the Waveguide Height or Suspending the Sensor. - Siim Heinsalu; Katsuyuki Utaka (Sensors, 2022)

Temperature-Insensitive pulse and 120℃ CW Operation of 1550nm-Band p-doped InAs/InGaAlAs Quantum Dot Lasers on InP(311)B Substrate. - Ryota Yabuki; Atsushi Matsumoto; Ryumi Katsuhara; Siim Heinsalu; Koichi Akahane; Yuichi Matsushima; Hiroshi Ishikawa; Katsuyuki Utaka (OFC, 2023)

Design and Experiment of Silicon Racetrack-Loop Multi-Mode Waveguide Structure with Low-Loss and Adjustable Couplings for Compact Reservoir Computing Device. - Siim Heinsalu; Katsuyuki Utaka (PSC, 2023)

Low-Power Switching of Polymer Mach-Zhender Type Optical Switch with 45° Mirror for Vertical Interconnection. - Ryo Kuwata; Siim Heinsalu; Yuichi Matsushima; Hiroshi Ishikawa; Katsuyuki Utaka (PSC, 2023)

Low Loss Fan-Out Structure for Multimode Waveguide-Based Reservoir Computing. - Hirotaka Oshima; Takashi Kan; Hideaki Tanaka; Hidenori Takahashi; Katsuyuki Utaka; Masatoshi Suzuki (PSC, 2023)

Low Threshold and 10kHz-Class Narrow Linewidth 1.55 µm-Band Quantum Dot Laser Diode on InP(311)B Substrate. - Atsushi Matsumoto; Ryota Yabuki; Shinya Nakajima; Toshimasa Umezawa; Siim Heinsalu; Yuichi Matsushima; Koichi Akahane; Naokatsu Yamamoto; Katsuyuki Utaka (OFC, 2024)