T
Takuro Fujii
Researcher at Nippon Telegraph and Telephone
Publications - 167
Citations - 1590
Takuro Fujii is an academic researcher from Nippon Telegraph and Telephone. The author has contributed to research in topics: Laser & Photonic crystal. The author has an hindex of 15, co-authored 141 publications receiving 1134 citations. Previous affiliations of Takuro Fujii include Keio University.
Papers
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Journal ArticleDOI
Membrane InGaAsP Mach–Zehnder Modulator Integrated With Optical Amplifier on Si Platform
Tatsurou Hiraki,Takuma Aihara,Takuro Fujii,Koji Takeda,Takaaki Kakitsuka,Tai Tsuchizawa,Shinji Matsuo +6 more
TL;DR: In this article, a high-efficiency Mach-Zehnder modulator (MZM) using InGaAsP phase shifters and a semiconductor optical amplifier (SOA) using multiple-quantum-well (MQW) are integrated on Si-waveguide circuits.
Journal ArticleDOI
>100-GHz Bandwidth Directly-Modulated Lasers and Adaptive Entropy Loading for Energy-Efficient >300-Gbps/λ IM/DD Systems
Nikolaos-Panteleimon Diamantopoulos,Hiroshi Yamazaki,Suguru Yamaoka,Munehiko Nagatani,Hidetaka Nishi,Hiromasa Tanobe,Ryo Nakao,Takuro Fujii,Koji Takeda,Takaaki Kakitsuka,Hitoshi Wakita,Minoru Ida,Hideyuki Nosaka,Fumio Koyama,Yutaka Miyamoto,Shinji Matsuo +15 more
TL;DR: These results pave the way towards low-cost and energy-efficient Terabit Ethernet and a significant step towards achieving DML-based 400-Gbps/λ IM/DD systems in the future.
Proceedings ArticleDOI
Net 321.24-Gb/s IMDD Transmission Based on a >100-GHz Bandwidth Directly-Modulated Laser
Nikolaos-Panteleimon Diamantopoulos,Hiroshi Yamazaki,Suguru Yamaoka,Munehiko Nagatani,Hidetaka Nishi,Hiromasa Tanobe,Ryo Nakao,Takuro Fujii,Koji Takeda,Takaaki Kakitsuka,Hitoshi Wakita,Minoru Ida,Hideyuki Nosaka,Fumio Koyama,Yutaka Miyamoto,Shinji Matsuo +15 more
TL;DR: A digitally-preprocessed analog multiplexer and adaptive entropy-loaded DMT modulation is used for DML-on-SiC transmissions, surpassing the previous record by ∼34%.
Proceedings ArticleDOI
Ultra-High Bandwidth InP IQ Modulator for Beyond 100-GBd Transmission
Yoshihiro Ogiso,Josuke Ozaki,Yuta Ueda,Hitoshi Wakita,Munehiko Nagatani,Hiroshi Yamazaki,Masanori Nakamura,Takayuki Kobayashi,Shigeru Kanazawa,Takuro Fujii,Yasuaki Hashizume,Hiromasa Tanobe,Nobuhiro Nunoya,Minoru Ida,Yutaka Miyamoto,M. Ishikawa +15 more
TL;DR: An ultra-high bandwidth IQ modulator with an electro-optic bandwidth of around 80 GHz at a half-wave voltage of 1.5 V is presented, which is a promising modulator for beyond 100-GBd transmission.
Journal ArticleDOI
Membrane III-V/Si DFB Laser Using Uniform Grating and Width-Modulated Si Waveguide
Takuma Aihara,Tatsurou Hiraki,Takuro Fujii,Koji Takeda,Takaaki Kakitsuka,Tai Tsuchizawa,Shinji Matsuo +6 more
TL;DR: In this paper, a uniform grating and Si waveguide are employed to construct an optical supermode with a 220-nm-thick Si-waveguide that is used in standard Si photonics platform.