Multi-Core Fibre with Concaved Double-D Shape Cross Section. - Takuji Nagashima; Shuhei Toyokawa; Tetsuya Hayashi; Tetsu Morishima; Hirotaka Sakuma; Tetsuya Nakanishi (ECOC, 2017)

Coupled-core optical amplifier. - Nicolas K. Fontaine; Jose Enrique Antonio-Lopez; Haoshuo Chen; Roland Ryf; David T. Neilson; Axel Schülzgen; Juan Carlos Alvarado-Zaharias; René-Jean Essiambre; Hirotaka Sakuma; Takemi Hasegawa; Tetsuya Nakanishi; Tetsuya Hayashi; et al. (OFC, 2017)

Lowest-ever 0.1419-dB/km loss optical fiber. - Yoshiaki Tamura; Hirotaka Sakuma; Keisei Morita; Masato Suzuki; Yoshinori Yamamoto; Kensaku Shimada; Yuya Honma; Kazuyuki Sohma; Takashi Fujii; Takemi Hasegawa (OFC, 2017)

Characterization of Coupled-Core Fiber Amplifiers using Swept-Wavelength Interferometer. - Juan Carlos Alvarado-Zacarias; Charles Matte-Breton; Roland Ryf; Nicolas K. Fontaine; Haoshuo Chen; Steffen Wittek; Hirotaka Sakuma; Takafumi Ohtsuka; Tetsuya Hayashi; Takemi Hasegawa; Sophie LaRochelle; Rodrigo Amezcua Correa (OFC, 2019)

Coupled 7-Core Erbium Doped Fiber Amplifier and Its Characterization. - Takafumi Ohtsuka; Masato Tanaka; Hirotaka Sakuma; Takemi Hasegawa; Tetsuya Hayashi; Hedehisa Tazawa (OFC, 2019)

Coupled-Core Transmission Over 7-Core Fiber. - Roland Ryf; Juan Carlos Alvarado-Zacarias; Steffen Wittek; Nicolas K. Fontaine; René-Jean Essiambre; Haoshuo Chen; Rodrigo Amezcua Correa; Hirotaka Sakuma; Tetsuya Hayashi; Takemi Hasegawa (OFC, 2019)

Double-D-Shaped Multi-Core Fiber with Suppressed Dimensional Fluctuation. - Takuji Nagashima; Hirotaka Sakuma; Shuhei Toyokawa; Tetsuya Hayashi; Tetsuya Nakanishi (OECC/PSC, 2019)

Transfer Matrix Characterization and Mode-Dependent Loss Optimization of Packaged 7-Core Coupled-Core EDFA. - Mikael Mazur; Nicolas K. Fontaine; Roland Ryf; Haoshuo Chen; Lauren Dallachiesa; Takafumi Ohtsuka; Hirotaka Sakuma; Tetsuya Hayashi; Takemi Hasegawa; Hidehisa Tazawa; David T. Neilson (ECOC, 2021)

Uncoupled Multi-core Fiber Design for Practical Bidirectional Optical Communications. - Tetsuya Hayashi; Takuji Nagashima; Ayumi Inoue; Hirotaka Sakuma; Takahiro Suganuma; Takemi Hasegawa (OFC, 2022)

Real-Time Transmission over 2×55 km All 7-Core Coupled-Core Multi-Core Fiber Link. - Mikael Mazur; Lauren Dallachiesa; Nicolas K. Fontaine; Roland Ryf; Erik Börjeson; Haoshuo Chen; Hirotaka Sakuma; Takafumi Ohtsuka; Tetsuya Hayashi; Takemi Hasegawa; Hidehisa Tazawa; David T. Neilson; et al. (OFC, 2022)

Comparison of transfer matrix stability between a 110 km 7-core coupled-core multi-core fiber and single-mode fiber. - Mikael Mazur; Nicolas K. Fontaine; Steve Corteselli; Haoshuo Chen; Lauren Dallachiesa; Tetsuya Hayashi; Hirotaka Sakuma; Takemi Hasegawa; Roland Ryf; David T. Neilson (OFC, 2022)

Record Low Loss Optical Fiber with 0.1397 dB/km. - Shin Sato; Yuki Kawaguchi; Hirotaka Sakuma; Tetsuya Haruna; Takemi Hasegawa (OFC, 2024)

Cavity-Assisted Pump Recycling for High-Efficiency Cladding-Pumped Erbium-Doped Fiber Amplifiers. - Haoshuo Chen; Roland Ryf; Nicolas K. Fontaine; Xiaonan Xu; Lauren Dallachiesa; Mikael Mazur; Hirotaka Sakuma; Takemi Hasegawa; Tetsuya Hayashi; David T. Neilson (OFC, 2025)

Macro- and Micro-Bending Performances of Uncoupled 200 μm-Coated Multi-Core Fibers. - Yuki Kawaguchi; Hirotaka Sakuma; Tetsuya Haruna; Tetsuya Hayashi; Takemi Hasegawa (OFC, 2025)

Behavior of Inter-core Crosstalk of Two-core Fiber in Submarine Cable. - Yuki Kawaguchi; Hirotaka Sakuma; Tetsuya Haruna; Takemi Hasegawa; Keisuke Yasuhara; Juan Carlos Aquino; Daishi Masuda (OFC, 2025)

Ultra-low Loss 0.1397dB/km Silica-core Single-mode Fiber. - Shin Sato; Yuki Kawaguchi; Hirotaka Sakuma; Tetsuya Haruna; Takemi Hasegawa (OFC, 2025)