Photonic Crystal Multi-Core Fibers for Future High-Capacity Transmission Systems. - Kazunori Mukasa; Katsunori Imamura; Yukihiro Tsuchida; Ryuichi Sugizaki (IEICE Trans. Commun., 2011)

FOPA with flat 21-dB gain and NF less than 4-dB using alternately concatenated pump-phase shifters and HNLFs. - Shigehiro Takasaka; Yu Mimura; Hiroshi Matsuura; Masahito Morimoto; Masanori Takahashi; Ryuichi Sugizaki (OFC/NFOEC, 2013)

Multicore EDFA for DWDM transmission in full C-band. - Yukihiro Tsuchida; Koichi Maeda; Kengo Watanabe; Toshiharu Ito; Kiyoshi Fukuchi; Masato Yoshida; Yu Mimura; Ryuichi Sugizaki; Masataka Nakazawa (OFC/NFOEC, 2013)

Bit-rate-tunable regeneration of 30-Gbaud QPSK data using phase quantization and amplitude saturation. - A. Mohajerin-Ariaei; Youichi Akasaka; Jeng-Yuan Yang; M. R. Chitgarha; Morteza Ziyadi; Yinwen Cao; Ahmed Almaiman; Joseph D. Touch; Moshe Tur; M. Sekiya; Shigehiro Takasaka; Ryuichi Sugizaki; et al. (ECOC, 2014)

Wideband parametric processing with 1-dB bandwidth of 40nm using dispersion stable PM-HNLF. - Shigehiro Takasaka; Yuki Taniguchi; Masanori Takahashi; Jiro Hiroshi; Masateru Tadakuma; Ryuichi Sugizaki (ECOC, 2014)

Quasi phase-matched FOPA with 50 nm gain bandwidth using dispersion stable highly nonlinear fiber. - Shigehiro Takasaka; Yuki Taniguchi; Masanori Takahashi; Jiro Hiroshi; Masateru Tadakuma; Hiroshi Matsuura; Kohei Doi; Ryuichi Sugizaki (OFC, 2014)

Multicore EDFA for space division multiplexing by utilizing cladding-pumped technology. - Yukihiro Tsuchida; Masateru Tadakuma; Ryuichi Sugizaki (OFC, 2014)

Cross-Talk with Fluctuation in Heterogeneous Multicore Fibers. - Takeshi Sugimori; Katsunori Imamura; Ryuichi Sugizaki (IEICE Trans. Commun., 2014)

Multicore EDFA for Space Division Multiplexing. - Yukihiro Tsuchida; Koichi Maeda; Ryuichi Sugizaki (IEICE Trans. Commun., 2014)

Experimental demonstration of Raman-assisted phase sensitive amplifier with negligible gain/power fluctuation. - Youichi Akasaka; Jeng-Yuan Yang; M. Sekiya; Tadashi Ikeuchi; Yinwen Cao; Ahmed Almaiman; Morteza Ziyadi; A. Mohajerin-Ariaei; Peicheng Liao; Alan E. Willner; Shigehiro Takasaka; Ryuichi Sugizaki (ECOC, 2015)

Experimental demonstration of optical signal level swapping and multi-level amplitude noise mitigation using three parametric gain regions. - Yinwen Cao; Morteza Ziyadi; Youichi Akasaka; Amirhossein Mohajerin Ariaei; Jeng-Yuan Yang; Ahmed Almaiman; Peicheng Liao; Shigehiro Takasaka; Ryuichi Sugizaki; Joseph D. Touch; M. Sekiya; Moshe Tur; et al. (OFC, 2015)

Experimental demonstration of tunable phase-noise mitigation and automatic frequency/phase locking for a 20-32 Gbaud QPSK homodyne receiver using optical mixing of nonlinearly generated higher harmonics. - A. Mohajerin-Ariaei; Morteza Ziyadi; M. R. Chitgarha; Ahmed Almaiman; Yinwen Cao; Youichi Akasaka; Jeng-Yuan Yang; M. Sekiya; Joseph D. Touch; Moshe Tur; Shigehiro Takasaka; Ryuichi Sugizaki; et al. (OFC, 2015)

51.1-Tbit/s MCF transmission over 2, 520 km using cladding pumped 7-core EDFAs. - Koki Takeshima; Takehiro Tsuritani; Yukihiro Tsuchida; Koichi Maeda; Tsunetoshi Saito; Kengo Watanabe; Toru Sasa; Katsunori Imamura; Ryuichi Sugizaki; Koji Igarashi; Itsuro Morita; Masatoshi Suzuki (OFC, 2015)

Polarization insensitive fiber optical parametric amplifier using a SBS suppressed diversity loop. - Shigehiro Takasaka; Ryuichi Sugizaki (OFC, 2016)

56-Gbaud PAM4 Transmission over 2-km 125-μm-Cladding 4-Core Multicore Fibre for Data Centre Communications. - Shohei Beppu; Hidenori Takahashi; Tomohiro Gonda; Katsunori Imamura; Kengo Watanabe; Ryuichi Sugizaki; Takehiro Tsuritani (ECOC, 2017)

Increase of Cladding Pump Power Efficiency by a 19-Core Erbium Doped Fibre Amplifier. - Shigehiro Takasaka; Koichi Maeda; Kohei Kawasaki; Kazuaki Yoshioka; Hajime Oshio; Ryuichi Sugizaki; Yu Kawaguchi; Hidenori Takahashi; Takehiro Tsuritani; Masato Shiino (ECOC, 2017)

Experimental demonstration of Raman-assisted phase sensitive amplifier with reduced ASE noise level and more than 25dB net gain. - Yinwen Cao; Ahmed Almaiman; Youichi Akasaka; Fatemeh Alishahi; Morteza Ziyadi; A. Mohajerin-Ariaei; Changjing Bao; Peicheng Liao; Ahmad Fallahpour; B. Shamee; Tadashi Ikeuchi; Shigehiro Takasaka; et al. (OFC, 2017)

Four-fiber Fan-out for MCF with square lattice structure. - Kohei Kawasaki; Takeshi Sugimori; Kengo Watanabe; Tsunetoshi Saito; Ryuichi Sugizaki (OFC, 2017)

Three-stage quasi-phase-matched fiber optical parametric amplifier with flat 30-dB gain with 31-nm bandwidth. - Shigehiro Takasaka; Ryuichi Sugizaki (OFC, 2017)

Experimental Demonstration of 1480nm Cladding Pumped Multicore EDFA. - Keiichi Matsumoto; Hitoshi Takeshita; K. Maeda; Shigehiro Takasaka; Ryuichi Sugizaki; Emmanuel Le Taillandier de Gabory (ECOC, 2018)

Long-Haul MCF Transmission Using Full C+L-Band 19-Core Cladding-Pumped EDFA. - Daiki Soma; Shohei Beppu; Koichi Maeda; Shigehiro Takasaka; Ryuichi Sugizaki; Hidenori Takahashi; Takehiro Tsuritani (ECOC, 2018)

Cladding Pump Recycling in 7-Core EDFA. - Shigehiro Takasaka; Koichi Maeda; Kohei Kawasaki; Kazuaki Yoshioka; Ryuichi Sugizaki; Masayoshi Tsukamoto (ECOC, 2018)

Recent Progress and Outlook on Multicore Fiber for Practical Use. - Tomohiro Gonda; Katsunori Imamura; Kohei Kawasaki; Ryuichi Sugizaki; Shinichi Arai; Masayoshi Tsukamoto; Masato Shiino (OFC, 2018)

EDF Length Dependence of Amplification Characteristics of Cladding Pumped 19-Core EDFA. - Shigehiro Takasaka; Koichi Maeda; Kohei Kawasaki; Kazuaki Yoshioka; Hajime Oshio; Ryuichi Sugizaki; Hidenori Takahashi; Takehiro Tsuritani; Masato Shiino (OFC, 2018)

Polarization-diversity In-line Phase Sensitive Amplifier for Simultaneous Amplification of Fiber-transmitted WDM PDM-16QAM Signals. - Takeshi Umeki; Takushi Kazama; Takayuki Kobayashi; Shigehiro Takasaka; Yasuhiro Okamura; Koji Enbutsu; Osamu Tadanaga; Hirokazu Takenouchi; Ryuichi Sugizaki; Atsushi Takada; Ryoichi Kasahara; Yutaka Miyamoto (OFC, 2018)

WDM Amplification of One Pump HNLF Based Phase Sensitive Amplifier with Static Pump Phase Tuning. - Youichi Akasaka; Yinwen Cao; Shigehiro Takasaka; Kenji Yamauchi; Koichi Maeda; Haoqian Song; Ryuichi Sugizaki; Alan E. Willner; Tadashi Ikeuchi (OFC, 2019)

0.715 Pb/s Transmission Over 2, 009.6 km in 19-Core Cladding Pumped EDFA Amplified MCF Link. - Benjamin J. Puttnam; Georg Rademacher; Ruben S. Luis; Tobias A. Eriksson; Werner Klaus; Yoshinari Awaji; Naoya Wada; Koichi Maeda; Shigehiro Takasaka; Ryuichi Sugizaki (OFC, 2019)

Cladding Pump Recycling Device for 19-Core EDFA. - Shigehiro Takasaka; Koichi Maeda; Kohei Kawasaki; Kazuaki Yoshioka; Ryuichi Sugizaki; Masayoshi Tsukamoto (OFC, 2019)

Field Test of Installed High-Density Optical Fiber Cable with Multi-Core Fibers toward Practical Deployment. - Takehiro Tsuritani; Daiki Soma; Yuta Wakayama; Yuichi Miyagawa; Mikoto Takahashi; Itsuro Morita; Koichi Maeda; Kohei Kawasaki; Toshikazu Matsuura; Masayoshi Tsukamoto; Ryuichi Sugizaki (OFC, 2019)

Propagation Direction Interleaved Cladding Pumped 19-core EDFA. - Koichi Maeda; Shigehiro Takasaka; Kohei Kawasaki; Kazuaki Yoshioka; Ryuichi Sugizaki; Masayoshi Tsukamoto (OECC/PSC, 2019)

Transmission and Crosstalk Measurements in MC-EDFA amplified 19-core link. - Benjamin J. Puttnam; Georg Rademacher; Ruben S. Luís; Tobias A. Eriksson; Werner Klaus; Yoshinari Awaji; Naoya Wada; Koichi Maeda; Shigehiro Takasaka; Ryuichi Sugizaki (OECC/PSC, 2019)

Design of 5-Core Multicore Fibers with Optimized Fiber Design for Practical Applications. - Masanori Takahashi; Koichi Maeda; Ryuichi Sugizaki; Shinichi Arai; Masayoshi Tsukamoto (OECC/PSC, 2019)

Uncoupled 4-core Fibre with Ultra-low Loss and Low Inter Core Crosstalk. - Masanori Takahashi; Koichi Maeda; Keiichi Aiso; Kazunori Mukasa; Ryuichi Sugizaki; Daiki Soma; Hidenori Takahashi; Takehiro Tsuritani; Miranda Mitrovic; Bera Pálsdóttir; Yoshihiro Arashitani (ECOC, 2020)

Output Power Increase of Cladding Pumped 7-core EDFA by Using Mie Scattering. - Shigehiro Takasaka; Koichi Maeda; Ryuichi Sugizaki; Yoshihiro Arashitani (ECOC, 2020)

Multicore Fiber Fabricated by Modified Cylinder Method. - Masanori Takahashi; Koichi Maeda; Ryuichi Sugizaki; Masayoshi Tsukamoto (OFC, 2020)

Reduced Impact of Frequency Dithering on the Performance of High-Order Modulation Format Phase Conjugation. - Abdallah A. I. Ali; Tu Thanh Nguyen; Sonia K. Boscolo; Shigehiro Takasaka; Ryuichi Sugizaki; Andrew D. Ellis (OFC, 2021)

Digital Compensation of Residual Pump Dithering in Optical Phase Conjugation of High-Order QAM. - Tu Thanh Nguyen; Sonia K. Boscolo; Abdallah A. I. Ali; Mingming Tan; Stylianos Sygletos; Shigehiro Takasaka; Ryuichi Sugizaki; Andrew D. Ellis (OFC, 2021)

Kernel-Based Learning-Aided Phase Noise Compensation in Dual-Pump Optical Phase Conjugation Coherent System. - Tu Thanh Nguyen; Sonia K. Boscolo; Abdallah A. I. Ali; Mingming Tan; Tingting Zhang; Shigehiro Takasaka; Ryuichi Sugizaki; Stylianos Sygletos; Andrew D. Ellis (OFC, 2021)

Core Selective Switch Supporting 15 Cores Per Port Using Bundled Three 5-Core Fibers. - Yudai Uchida; Tsubasa Ishikawa; Itsuki Urashima; Shoma Murao; Takahiro Kodama; Yasuki Sakurai; Ryuichi Sugizaki; Masahiko Jinno (OFC, 2022)

S-band Amplifier Using Highly Nonlinear Fibers. - Youichi Akasaka; Shigehiro Takasaka; Ryuichi Sugizaki; Cheng Guo 011; Michael Vasilyev (OECC/PSC, 2022)

Power-saving Aware SDM Photonic Node with the Throughput Scalable to over Peta bit. - Fumikazu Inuzuka; Hiroshi Hasegawa; Kohki Shibahara; Hidenori Takahashi; Takehiro Tsuritani; Kazunori Seno; Naru Nemoto; Emmanuel Le Taillandier de Gabory; Shigeyuki Yanagimachi; Taiji Sakamoto; Kazuhide Nakajima; Masanori Takahashi; et al. (OECC/PSC, 2022)

Design of 19-Core Multicore Fibers for High Density Optical Wiring. - Yusuke Matsuno; Masanori Takahashi; Ryuichi Sugizaki; Yoshihiro Arashitani (OECC/PSC, 2022)

4-Core Fan-out with Practical Environmental Performance. - Tsubasa Sasaki; Masanori Takahashi; Ryuichi Sugizaki; Yoshihiro Arashitani (OECC/PSC, 2022)

Multicore Fiber Fusion Splicer Suitable for Practical Applications. - Masanori Takahashi; Toshiyuki Fujii; Ryuichi Sugizaki; Akio Tanabe; Yoshihiro Arashitani (OECC/PSC, 2022)

Fan-in/Fan-out for multicore fibers. - Masanori Takahashi; Kohei Kawasaki; Ryuichi Sugizaki; Yoshihiro Arashitani (OECC/PSC, 2022)

Low Fusion Splice Loss Technique for Multicore Fiber with 2- and 3-electrode Fusion Splicers. - Toshiyuki Fujii; Masanori Takahashi; Ryuichi Sugizaki; Akio Tanabe; Yoshihiro Arashitani (OFC, 2023)

Temperature-tuned two-segment highly-nonlinear fiber with increased stimulated Brillouin scattering threshold. - Cheng Guo; Michael Vasilyev; Youichi Akasaka; Paparao Palacharla; Shigehiro Takasaka; Ryuichi Sugizaki (OFC, 2023)

Single Multicore-Fiber Bidirectional Spatial Channel Network Based on Spatial Cross-Connect and Multicore EDFA Efficiently Accommodating Asymmetric Traffic. - Kyosuke Nakada; Hitoshi Takeshita; Yuki Kuno; Yusuke Matsuno; Itsuki Urashima; Yusuke Shimomura; Yuji Hotta; Tsubasa Sasaki; Yudai Uchida; Kohei Hosokawa; Ryohei Otowa; Rika Tahara; et al. (OFC, 2023)

Design and applications of Highly nonlinear fibers. - Ryuichi Sugizaki; Masanori Takahashi; Shigehiro Takasaka; Toshio Kimura (OFC, 2023)

4-Core Fiber Narrow Pitch Fanout Comprised of Tapered High-Δ MCF. - Masanori Takahashi; Tsubasa Sasaki; Ryuichi Sugizaki; Yoshihiro Arashitani (OFC, 2023)

Characteristics and System Impact of Multipath Interference in Optical Devices with Short Multicore Fibers for Spatial Channel Networks. - Kyosuke Nakada; Yusuke Matsuno; Yudai Uchida; Masanori Takahashi; Rika Tahara; Takuma Izumi; Ryuichi Sugizaki; Masahiko Jinno (PSC, 2023)

Bidirectional single-multicore-fiber spatial channel network based on a spatial cross-connect and multicore EDFA that efficiently accommodates asymmetric data traffic. - Kyosuke Nakada; Hitoshi Takeshita; Yuki Kuno; Yusuke Matsuno; Itsuki Urashima; Yusuke Shimomura; Yuji Hotta; Tsubasa Sasaki; Yudai Uchida; Kohei Hosokawa; Ryohei Otowa; Rika Tahara; et al. (JOCN, 2023)

Standard Coating Diameter Uncoupled 19-Core Multicore Fiber with Highest Core Density for Optical Wiring. - Yusuke Matsuno; Ryuichi Sugizaki; Masanori Takahashi (OFC, 2024)

Fiber Bundle Fan-in/Fan-out (FIFO) for Coupled MCF with High-Δ 4-Core Fiber Pitch Converter. - Masanori Takahashi; Tsubasa Sasaki; Ryuichi Sugizaki (OFC, 2024)

Phase-preserving amplitude regeneration in a Mamyshev regenerator with group-delay-managed nonlinear medium and mid-stage optical phase conjugation. - Cheng Guo; Hamed Rabbani; Mohammad Awwad; Youichi Akasaka; Paparao Palacharla; Ryuichi Sugizaki; Shigehiro Takasaka; Michael Vasilyev (OFC, 2025)

Practical Wavelength Conversion Techniques Using Highly Nonlinear Fibers. - Shigehiro Takasaka; Ryuichi Sugizaki; Masanori Takahashi (OFC, 2025)

Demonstration of 4-Core/16-Core Fiber Heterogeneous Spatial Channel Network Comprising 19-Core Fiber Core Selective Switch-Based Spatial Gateway, 4-Core EDFAs, and 19-Core EDFAs. - Takumi Tani; Daiki Soma; Ryohei Otowa; Yusuke Matsuno; Kyosuke Nakada; Kosuke Komatsu; Yuji Hotta; Tsubasa Sasaki; Rika Tahara; Shohei Beppu; Koichi Maeda; Takuma Izumi; et al. (OFC, 2025)