Vertically Coupled Microring Resonator Filter for Integrated Add/Drop Node. - Yasuo Kokubun (IEICE Trans. Electron., 2005)

Optimum Wavelength Filter Spectrum Response in DWDM Systems for Ultimate Spectral Efficiency. - Shuichi Suzuki; Yasuo Kokubun (IEICE Trans. Commun., 2005)

High UV Sensitivity of SiON Film and Its Application to Center Wavelength Trimming of Microring Resonator Filter. - Satoshi Ueno; Toshiki Naganawa; Yasuo Kokubun (IEICE Trans. Electron., 2005)

Fabrication of Microchannel with Thin Cover Layer for an Optical Waveguide MEMS Switch Based on Microfluidics. - Takuji Ikemoto; Yasuo Kokubun (IEICE Trans. Electron., 2007)

High Index Contrast Optical Waveguides and Their Applications to Microring Filter Circuit and Wavelength Selective Switch. - Yasuo Kokubun (IEICE Trans. Electron., 2007)

Driving Voltage Analysis for Fast Response of Waveguide Optical Switch Based on Movement of Liquid Droplet Driven by Electrostatic Force. - Takuji Ikemoto; Yasuo Kokubun (IEICE Trans. Electron., 2008)

Novel multi-core fibers for mode division multiplexing: proposal and design principle. - Yasuo Kokubun; Masanori Koshiba (IEICE Electron. Express, 2009)

Heterogeneous multi-core fibers: proposal and design principle. - Masanori Koshiba; Kunimasa Saitoh; Yasuo Kokubun (IEICE Electron. Express, 2009)

First demonstration of hitless wavelength selective switch based on quadruple series coupled multiple quantum well microring resonator. - Hiroshi Kamiya; Tsuyoshi Goto; Katouf Redouane; Taro Arakawa; Yasuo Kokubun (OFC/NFOEC, 2013)

Stacked waveguide type mode-evolutional multi/demultiplexer for LP01 LP11a and LP11b. - Tatsuhiko Watanabe; Yasuo Kokubun (ECOC, 2014)

Over 300 channels uncoupled few-mode multi-core fiber for space division multiplexing. - Tatsuhiko Watanabe; Yasuo Kokubun (OFC, 2014)

Mode-evolutional serial branching 4-mode multi/demultiplexer for homogeneous coupled multi-core fiber. - Tatsuhiko Watanabe; Kyohei Kojima; Yasuo Kokubun (ECOC, 2015)

What is a mode in few mode fibers?: Proposal of MIMO-free mode division multiplexing using true eigenmodes. - Yasuo Kokubun; Tatsuhiko Watanabe; Seiya Miura; Ryo Kawata (IEICE Electron. Express, 2016)

Serial branching mode multi/demultiplexer for homogeneous multi-core fibers. - Tatsuhiko Watanabe; Kyohei Kojima; Yasuo Kokubun (IEICE Electron. Express, 2016)

Design of Fourth-Order Series Coupled Microring Filter on Chebyshev Filter Condition. - Nobuyuki Hayasaka; Taro Arakawa; Yasuo Kokubun (IEICE Trans. Electron., 2016)

Passive waveguide device technologies - Building block of functionality and integration. - Yasuo Kokubun (OFC, 2017)

Proposal of Waveguide-Type Polarization Switch Based on Microring Resonator. - Keita Suzuki; Tomoki Hirayama; Yasuo Kokubun; Taro Arakawa (IEICE Trans. Electron., 2017)

Full-set high-speed mode analysis in few-mode fibers by polarization-split segmented coherent detection method: Proposal and simulation of calculation error. - Ryo Kawata; Tatsuhiko Watanabe; Yasuo Kokubun (IEICE Electron. Express, 2018)

Demonstration of true-eigenmode propagation in few-mode fibers by selective LP mode excitation and near-field observation. - Takuto Yamaguchi; Seiya Miura; Yasuo Kokubun (IEICE Electron. Express, 2018)

Demonstration of true-eigenmode propagation in few-mode fibers by selective LP mode excitation and near-field observation [IEICE Electronics Express Vol. 15(2018) No. 10 pp. 20180344]. - Takuto Yamaguchi; Seiya Miura; Yasuo Kokubun (IEICE Electron. Express, 2018)

Predictable and unpredictable phenomena in optical fibers for space-division/mode-division multiplexing transmission: statistical analysis of coupling and mysterious behavior of modes. - Yasuo Kokubun; Masanori Koshiba (IEICE Electron. Express, 2020)

Erratum: Predictable and unpredictable phenomena in optical fibers for space-division/mode-division multiplexing transmission: statistical analysis of coupling and mysterious behavior of modes [IEICE Electronics Express Vol. 17 (2020) No. 15 pp. 20202001]. - Yasuo Kokubun; Masanori Koshiba (IEICE Electron. Express, 2020)

Behavior of intercore crosstalk in square-layout uncoupled four-core fibers. - Masanori Koshiba; Yasuo Kokubun; Mayu Nakagawa; Masaki Ohzeki; Katsuhiro Takenaga (IEICE Electron. Express, 2022)