Fundamental Characteristics of Localized Acoustic Modes in Photonic Crystal Fibers. - Ikumi Enomori; Kunimasa Saitoh; Masanori Koshiba (IEICE Trans. Electron., 2005)

Transmission characteristics of laterally illuminated photonic crystal fibers. - Keiichi Morikawa; Takeshi Fujisawa; Kunimasa Saitoh; Masanori Koshiba (IEICE Electron. Express, 2006)

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

Design of effectively single-mode leakage channel fibers with large mode area and low bending loss. - Kunimasa Saitoh; Yukihiro Tsuchida; Masanori Koshiba (IEICE Electron. Express, 2009)

Crosstalk behavior of cores in multi-core fiber under bent condition. - Shoichiro Matsuo; Katsuhiro Takenaga; Yoko Arakawa; Yusuke Sasaki; Shoji Tanigawa; Kunimasa Saitoh; Masanori Koshiba (IEICE Electron. Express, 2011)

Crosstalk behavior of multi-core fiber with structural parameter drift in longitudinal direction. - Shoichiro Matsuo; Katsuhiro Takenaga; Yoko Arakawa; Yusuke Sasaki; Shoji Tanigawa; Kunimasa Saitoh; Masanori Koshiba (IEICE Electron. Express, 2011)

An Investigation on Crosstalk in Multi-Core Fibers by Introducing Random Fluctuation along Longitudinal Direction. - Katsuhiro Takenaga; Yoko Arakawa; Shoji Tanigawa; Ning Guan; Shoichiro Matsuo; Kunimasa Saitoh; Masanori Koshiba (IEICE Trans. Commun., 2011)

All-solid photonic bandgap fiber with record mode area. - Fanting Kong; Kunimasa Saitoh; Devon Mcclane; Thomas W. Hawkins; Paul Foy; Guancheng Gu; Liang Dong (OFC/NFOEC, 2013)

Recent progress on multi-core fiber and few-mode fiber. - S. Matsuo; Yusuke Sasaki; I. Ishida; Katsuhiro Takenaga; Kunimasa Saitoh; Masanori Koshiba (OFC/NFOEC, 2013)

Investigation of crosstalk dependencies on bending radius of heterogeneous multicore fiber. - Yusuke Sasaki; Yoshimichi Amma; Katsuhiro Takenaga; S. Matsuo; Kunimasa Saitoh; Masanori Koshiba (OFC/NFOEC, 2013)

Low-loss and broadband PLC-type mode (de)multiplexer for mode-division multiplexing transmission. - Takui Uematsu; Kunimasa Saitoh; Nobutomo Hanzawa; Taiji Sakamoto; Takashi Matsui; Kyozo Tsujikawa; Masanori Koshiba (OFC/NFOEC, 2013)

Four-mode PLC-based mode multi/demultiplexer with LP11 mode rotator on one chip for MDM transmission. - Nobutomo Hanzawa; Kunimasa Saitoh; Taiji Sakamoto; Takashi Matsui; Kyozo Tsujikawa; Takui Uematsu; Fumihiko Yamamoto (ECOC, 2014)

Few-mode multicore fibre with 36 spatial modes (Three modes (LP01, LP11a, LP11b) ×12 cores). - Yusuke Sasaki; Yoshimichi Amma; Katsuhiro Takenaga; Shoichiro Matsuo; Kunimasa Saitoh; Masanori Koshiba (ECOC, 2014)

Multicore fibre-based mode multiplexer/demultiplexer for three-mode operation of LP01, LP11a, and LP11b. - Katsuhiro Takenaga; H. Uemura; Yusuke Sasaki; S. Nishimoto; Takui Uematsu; K. Omichi; R. Goto; S. Matsuo; Kunimasa Saitoh (ECOC, 2014)

Dependence of crosstalk increase due to tight bend on core layout of multi-core fiber. - Tetsuya Hayashi; Tetsuya Nakanishi; Takashi Sasaki; Kunimasa Saitoh; Masanori Koshiba (OFC, 2014)

12-core × 3-mode dense space division multiplexed transmission over 40 km employing multi-carrier signals with parallel MIMO equalization. - Takayuki Mizuno; Takayuki Kobayashi; Hidehiko Takara; Akihide Sano; Hiroto Kawakami; T. Nakagawa; Yutaka Miyamoto; Yoshiteru Abe; T. Goh; Manabu Oguma; Taiji Sakamoto; Yusuke Sasaki; et al. (OFC, 2014)

PLC-type LP11 mode rotator with single-trench waveguide for mode-division multiplexing transmission. - Takui Uematsu; Nobutomo Hanzawa; Kunimasa Saitoh; Yuhei Ishizaka; Kouhei Masumoto; Taiji Sakamoto; Takashi Matsui; Kyozo Tsujikawa; Fumihiko Yamamoto (OFC, 2014)

Mode multiplexer/demultiplexer based on a partially elongated multi-core fiber. - H. Uemura; Yusuke Sasaki; S. Nishimoto; Takui Uematsu; Katsuhiro Takenaga; K. Omichi; R. Goto; Shinji Matsuo; Kunimasa Saitoh (OFC, 2014)

A principal mode analysis of strongly-coupled 3-core fibres. - Takeshi Fujisawa; Kunimasa Saitoh (ECOC, 2015)

Demonstration of PLC-based six-mode multiplexer for mode division multiplexing transmission. - Nobutomo Hanzawa; Kunimasa Saitoh; Taiji Sakamoto; Takashi Matsui; Kyozo Tsujikawa; Takeshi Fujisawa; Yuhei Ishizaka; Fumihiko Yamamoto (ECOC, 2015)

High-spatial-multiplicity multi-core fibres for future dense space-division-multiplexing system. - Shoichiro Matsuo; Katsuhiro Takenaga; Kunimasa Saitoh; Kazuhide Nakajima; Yutaka Miyamoto; Toshio Morioka (ECOC, 2015)

Mode dependent loss equaliser and impact of MDL on PDM-16QAM few-mode fibre transmission. - T. Mizuno; H. Takara; Kohki Shibahara; Yutaka Miyamoto; Manabu Oguma; Hirotaka Ono 002; Y. Abe; Takashi Matsui; S. Matsuo; Kunimasa Saitoh; Y. Kimura (ECOC, 2015)

Measurement of inter-core crosstalk in few-mode multicore fibre. - S. Saitoh; Yusuke Sasaki; Katsuhiro Takenaga; M. Ohashi; Kunimasa Saitoh; Kazuhide Nakajima; Shinji Matsuo (ECOC, 2015)

Few-mode multi-core fibre with highest core multiplicity factor. - Taiji Sakamoto; Takashi Matsui; Kunimasa Saitoh; Shota Saitoh; Katsuhiro Takenaga; Shoichiro Matsuo; Yuki Tobita; Nobutomo Hanzawa; Kazuhide Nakajima; Fumihiko Yamamoto (ECOC, 2015)

Quasi-single-mode homogeneous 31-core fibre. - Yusuke Sasaki; S. Saitoh; Yoshimichi Amma; Katsuhiro Takenaga; S. Matsuo; Kunimasa Saitoh; Toshio Morioka; Yutaka Miyamoto (ECOC, 2015)

High-density multicore fiber with heterogeneous core arrangement. - Yoshimichi Amma; Yusuke Sasaki; Katsuhiro Takenaga; S. Matsuo; J. Tu; Kunimasa Saitoh; Masanori Koshiba; Toshio Morioka; Yutaka Miyamoto (OFC, 2015)

Multicore fiber technology. - Kunimasa Saitoh (OFC, 2015)

Dense SDM (12-core × 3-mode) transmission over 527 km with 33.2-ns mode-dispersion employing low-complexity parallel MIMO frequency-domain equalization. - Kohki Shibahara; Takayuki Mizuno; Hidehiko Takara; Akihide Sano; H. Kawakami; D. Lee; Yutaka Miyamoto; Hirotaka Ono 002; Manabu Oguma; Yoshiteru Abe; Takayuki Kobayashi; Takashi Matsui; et al. (OFC, 2015)

High-count multi-core fibers for space-division multiplexing with propagation-direction interleaving. - Feihong Ye; Kunimasa Saitoh; Hidehiko Takara; Rameez Asif; Toshio Morioka (OFC, 2015)

Extremely small group delay spread six-core fiber with air-holes for mode-division-multiplexing: A principal mode analysis. - Takeshi Fujisawa; Ren Tojo; Shota Saitoh; Shoichiro Matsuo; Kunimasa Saitoh (OFC, 2016)

32-core Dense SDM unidirectional transmission of PDM-16QAM signals over 1600 km using crosstalk-managed single-mode heterogeneous multicore transmission line. - Takayuki Mizuno; Kohki Shibahara; Hirotaka Ono 002; Y. Abe; Yutaka Miyamoto; Feihong Ye; Toshio Morioka; Yusuke Sasaki; Yoshimichi Amma; Katsuhiro Takenaga; S. Matsuo; Kazuhiko Aikawa; et al. (OFC, 2016)

Low-loss and Low-DMD few-mode multi-core fiber with highest core multiplicity factor. - Taiji Sakamoto; Takashi Matsui; Kunimasa Saitoh; S. Saitoh; Katsuhiro Takenaga; Takayuki Mizuno; Yoshiteru Abe; Kohki Shibahara; Yuki Tobita; Shinji Matsuo; Kazuhiko Aikawa; Shinichi Aozasa; et al. (OFC, 2016)

Space-time coding-assisted transmission for mitigation of MDL impact on mode-division multiplexed signals. - Kohki Shibahara; Takayuki Mizuno; Hidehiko Takara; H. Kawakami; D. Lee; Yutaka Miyamoto; S. Matsuo; Kunimasa Saitoh; Makoto Yamada (OFC, 2016)

High-density multicore fibers. - Katsuhiro Takenaga; Shoichiro Matsuo; Kunimasa Saitoh; Toshio Morioka; Yutaka Miyamoto (OFC, 2016)

Mach-Zehnder Mode/Wavelength (De)Multiplexer for WDM/MDM Optical Transmission. - Shun Ohta; Takeshi Fujisawa; Shuntaro Makino; Taiji Sakamoto; Takashi Matsui; Kyozo Tsujikawa; Kazuhide Nakajima; Kunimasa Saitoh (ECOC, 2017)

High Spatial Density Six-mode Seven-core Fibre for Repeated Dense SDM Transmission. - Taiji Sakamoto; Kunimasa Saitoh; Shota Saitoh; Kohki Shibahara; Masaki Wada; Yoshiteru Abe; Azusa Urushibara; Katsuhiro Takenaga; Takayuki Mizuno; Takashi Matsui; Kazuhiko Aikawa; Yutaka Miyamoto; et al. (ECOC, 2017)

Group Delay Spread Analysis of Few-Mode, Coupled 3-Core Fibres: Optimum Index Profile and Maximum Transmission Distance for Strong Coupling Regime. - Kazuki Yoshida; Takeshi Fujisawa; Takanori Sato; Kunimasa Saitoh (ECOC, 2017)

One chip, PLC three-mode exchanger based on symmetric and asymmetric directional couplers with integrated mode rotator. - Takeshi Fujisawa; Eri Taguchi; Taiji Sakamoto; Takashi Matsui; Yoko Yamashita; Kyozo Tsujikawa; Kazuhide Nakajima; Kunimasa Saitoh (OFC, 2017)

Scrambling-type three-mode multiplexer based on cascaded Y-branch waveguide with integrated mode rotator on PLC platform. - Takeshi Fujisawa; Yoko Yamashita; Taiji Sakamoto; Takashi Matsui; Shuntaro Makino; Kyozo Tsujikawa; Kazuhide Nakajima; Kunimasa Saitoh (OFC, 2017)

1-Pb/s (32 SDM/46 WDM/768 Gb/s) C-band dense SDM transmission over 205.6-km of single-mode heterogeneous multi-core fiber using 96-Gbaud PDM-16QAM channels. - Takayuki Kobayashi; Masanori Nakamura; Fukutaro Hamaoka; Kohki Shibahara; Takayuki Mizuno; Akihide Sano; H. Kawakami; Akira Isoda; Munehiko Nagatani; Hiroshi Yamazaki; Yutaka Miyamoto; Yoshimichi Amma; et al. (OFC, 2017)

Ultimately low-loss and compact Si wire 90° waveguide bend composed of clothoid and normal curves for dense optical interconnect PICs. - Shuntaro Makino; Masahiro Suga; Takanori Sato; Takeshi Fujisawa; Kunimasa Saitoh (OFC, 2017)

A photonic-plasmonic mode converter using mode-coupling-based polarization rotation for metal-inserted silicon platform. - Yuhei Ishizaka; Masaru Nagai; Takeshi Fujisawa; Kunimasa Saitoh (IEICE Electron. Express, 2017)

1.2 Pb/s Transmission Over a 160 µm Cladding, 4-Core, 3-Mode Fiber, Using 368 C+L band PDM-256-QAM Channels. - Ruben S. Luis; Georg Rademacher; Benjamin J. Puttnam; Tobias A. Eriksson; Hideaki Furukawa; Andrew Ross-Adams; Simon Gross; Michael J. Withford; Nicolas Riesen; Yusuke Sasaki; Kunimasa Saitoh; Kazuhiko Aikawa; et al. (ECOC, 2018)

120 Spatial Channel Few-Mode Multi-Core Fibre with Relative Core Multiplicity Factor Exceeding 100. - Taiji Sakamoto; Kunimasa Saitoh; Shota Saitoh; Yoshiteru Abe; Katsuhiro Takenaga; Azusa Urushibara; Masaki Wada; Takashi Matsui; Kazuhiko Aikawa; Kazuhide Nakajima (ECOC, 2018)

Iterative Unreplicated Parallel Interference Canceler for MDL-Tolerant Dense SDM 12-Core×3-Mode Transmission Over 3000 km. - Kohki Shibahara; Takayuki Mizuno; Doowhan Lee; Yutaka Miyamoto; Hirotaka Ono 002; Kazuhide Nakajima; Yoshimichi Amma; Katsuhiro Takenaga; Kunimasa Saitoh (ECOC, 2018)

DMD-Unmanaged Long-Haul SDM Transmission Over 2500-km 12-core × 3-mode MC-FMF and 6300-km 3-mode FMF Employing Intermodal Interference Cancelling Technique. - Kohki Shibahara; Takayuki Mizuno; L. Doowhan; Yutaka Miyamoto; Hirotaka Ono 002; Kazuhide Nakajima; S. Saitoh; Katsuhiro Takenaga; Kunimasa Saitoh (OFC, 2018)

Non-circular multi-core fibers for super-dense SDM. - Md. Nooruzzaman; Kunimasa Saitoh; Yusuke Sasaki; Katsuhiro Takenaga; Kazuhiko Aikawa; Toshio Morioka (IEICE Electron. Express, 2018)

A Review of PLC-Based Broadband Two-Mode Multi/Demultiplexer Designed by Wavefront Matching Method. - Eri Taguchi; Takeshi Fujisawa; Yoko Yamashita; Shuntaro Makino; Nobutomo Hanzawa; Taiji Sakamoto; Takashi Matsui; Kyozo Tsujikawa; Kazuhide Nakajima; Fumihiko Yamamoto; Kunimasa Saitoh (IEICE Trans. Electron., 2018)

A Broadband Mode Divider with Arbitrary Branching Ratio Based on Wavelength-Insensitive Coupler. - Misa Kudo; Takeshi Fujisawa; Taiji Sakamoto; Takashi Matsui; Kyozo Tsujikawa; Kazuhide Nakajima; Kunimasa Saitoh (OFC, 2019)

Dynamic Crosstalk Study in a Few-Mode-Multi-Core Fiber. - Benjamin J. Puttnam; Georg Rademacher; Ruben S. Luis; Hideaki Furukawa; Andrew Ross-Adams; Simon Gross; Michael J. Withford; Nicolas Riesen; Yusuke Sasaki; Kunimasa Saitoh; Kazuhike Aikawa; Yoshinari Awaji; et al. (OFC, 2019)

First Experimental Demonstration of Wavefront-Matching-Method-Designed Silicon Mode Converters. - Yusuke Sawada; Takeshi Fujisawa; Takanori Sato; Kunimasa Saitoh (OFC, 2019)

Low-Loss and Fabrication-Tolerant Si Four-Wavelength Multiplexer using Higher-Order Mode for 100/400GbE. - Junya Takano; Takeshi Fujisawa; Takanori Sato; Yusuke Sawada; Taiji Sakamoto; Takashi Matsui; Kyozo Tsujikawa; Kazuhide Nakajima; Kunimasa Saitoh (OFC, 2019)

Cladding Diameter Dependence of Inter-Core Crosstalk in Heterogeneous Multicore Fibers. - Kenta Nishimura; Takanori Sato; Takeshi Fujisawa; Yoshimichi Amma; Katsuhiro Takenaga; Kazuhiko Aikawa; Kunimasa Saitoh (OECC/PSC, 2019)

Ultra-Robust Design of Mode (De)Multiplexer Based on Asymmetrical Directional Coupler Using Wire and One-Side Rib Waveguides. - Takanori Sato; Takeshi Fujisawa; Kunimasa Saitoh (OECC/PSC, 2019)

A Design of Low MDL Scrambling-type PLC 6-mode Multiplexer. - Motoki Shirata; Misa Kudo; Takeshi Fujisawa; Taiji Sakamoto; Takashi Matsui; Kyozo Tsujikawa; Kazuhide Nakajima; Kunimasa Saitoh (OECC/PSC, 2019)

3-Mode PLC-Based Mode Dependent Loss Equalizer in MDM Transmission. - Naoto Sugawara; Misa Kudo; Takeshi Fujisawa; Taiji Sakamoto; Takashi Matsui; Kyozo Tsujikawa; Kazuhide Nakajima; Kunimasa Saitoh (OECC/PSC, 2019)

CMOS-compatible Si-wire polarization beam splitter based on wavelength-insensitive coupler. - Yusuke Sawada; Takeshi Fujisawa; Takanori Sato; Kunimasa Saitoh (IEICE Electron. Express, 2019)

Few-mode Multi-core Fibres: Weakly-coupling and Randomly-coupling. - Kunimasa Saitoh (ECOC, 2020)

Modal Amplitude and Phase Estimation of NFP of Six-Mode FMF Based on Artificial Neural Network with the Help of Grey-Wolf-Optimizer. - Naoto Sugawara; Takeshi Fujisawa; Kodai Nakamura; Yusuke Sawada; Taiji Sakamoto; Takashi Matsui; Kazuhide Nakajima; Kunimasa Saitoh (ECOC, 2020)

Wavefront-Matching-Method-Designed Six-Mode-Exchanger Based on Grating-Like Waveguide on Silica-PLC Platform. - Takeshi Fujisawa; Taiji Sakamoto; Masashi Miyata; Takashi Matsui; Toshikazu Hashimoto; Ryoichi Kasahara; Kazuhide Nakajima; Kunimasa Saitoh (OFC, 2020)

A Tunable Mode Divider Based on Wavelength Insensitive Coupler using Thermo-Optic Effect for Gain-Equalization in MDM Network. - Kodai Nakamura; Takeshi Fujisawa; Taiji Sakamoto; Takashi Matsui; Kazuhide Nakajima; Kunimasa Saitoh (OFC, 2020)

Low-Loss Silicon 2 × 4λ Multiplexers Composed of On-Chip Polarization-Splitter-Rotator and 2 × 2 and 2 × 1 Mach-Zehnder Filters for 400GbE. - Junya Takano; Takeshi Fujisawa; Yusuke Sawada; Kunimasa Saitoh (OFC, 2020)

Multi-core Fiber Technology for SDM: Coupling Mechanisms and Design. - Kunimasa Saitoh (OFC, 2021)

Experimental Demonstration of Broadband Silicon 4-Mode (de)Multiplexer Designed by Wavefront-Matching Method. - Yusuke Sawada; Takeshi Fujisawa; Takanori Sato; Kunimasa Saitoh (OFC, 2021)

High-tolerance CWDM4 wavelength multiplexer based on 2×2/2×1 MZ filters with polarization multiplexing. - Kodai Nakamura; Takeshi Fujisawa; Takanori Sato; Kunimasa Saitoh (IEICE Electron. Express, 2021)

Silica-PLC based mode-dependent-loss equalizer for two LP mode transmission. - Takeshi Fujisawa; Takayoshi Mori; Junji Sakamoto; Yoko Yamashita; Taiji Sakamoto; Ryota Imada; Ryoto Ima; Takanori Sato; Kei Watanabe; Ryoichi Kasahara; Toshikazu Hashimoto; Kazuhide Nakajima; et al. (OFC, 2022)

Compact Power Splitters with Mosaic-based Structure Designed by Bayesian Direct-binary-search Method. - Takuya Mitarai; Takeshi Fujisawa; Takuya Okimoto; Naoya Kono; Naoki Fujiwara; Yusuke Sawada; Taichi Muratsubaki; Takanori Sato; Kunimasa Saitoh; Hideki Yagi (OECC/PSC, 2022)

Analysis of Crosstalk Dependence on Cladding Diameter in Heterogeneous Multi-core Fibers by Considering Polarization-mode Coupling Effects. - Gustavo Ocampo; Takanori Sato; Takeshi Fujisawa; Yoshimichi Amma; Kunimasa Saitoh (OECC/PSC, 2022)

Fabrication-tolerant, 2-mode, 4λ multiplexer based on Si waveguides for beyond Tbit/s optical Ethernet. - Takeshi Fujisawa; Kunimasa Saitoh (OFC, 2023)

Relationship between Polarization Mode Dispersion and Crosstalk in Heterogeneous Multi-core Fibers with Different Cladding Diameters. - Gustavo Ocampo; Takanori Sato; Takeshi Fujisawa; Mayu Nakagawa; Kunimasa Saitoh (OFC, 2023)

Design of PLC E31-E13 and E-LP tapered mode converters using fast quasiadiabatic dynamics. - Han Wang; Takeshi Fujisawa; Takanori Sato; Masaki Wada; Takayoshi Mori; Taiji Sakamoto; Ryota Imada; Takashi Matsui; Kazuhide Nakajima; Kunimasa Saitoh (IEICE Electron. Express, 2023)

Stress Distribution Effects on Polarization-Mode Dispersion in Multi-Core Fibers. - Gustavo Ocampo; Yoshimichi Amma; Kunimasa Saitoh (OFC, 2024)

A silicon mode multiplexer based on the three-stage cascaded wavelength insensitive coupler for MDM-WDM transmission system. - Kodai Nakamura; Takanori Sato; Kunimasa Saitoh (IEICE Electron. Express, 2024)