W
Wataru Kobayashi
Researcher at Nippon Telegraph and Telephone
Publications - 152
Citations - 1793
Wataru Kobayashi is an academic researcher from Nippon Telegraph and Telephone. The author has contributed to research in topics: Laser & Distributed feedback laser. The author has an hindex of 18, co-authored 152 publications receiving 1572 citations.
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Journal ArticleDOI
Few-fJ/bit data transmissions using directly modulated lambda-scale embedded active region photonic-crystal lasers
Koji Takeda,Tomonari Sato,Akihiko Shinya,Kengo Nozaki,Wataru Kobayashi,Hideaki Taniyama,Masaya Notomi,Koichi Hasebe,Takaaki Kakitsuka,Shinji Matsuo +9 more
TL;DR: In this article, a photonic-crystal nanocavity laser was used to demonstrate high-speed modulation and 4.4 fJ bit−1 data transmission with high-sensitivity receivers.
Journal ArticleDOI
50-Gb/s Direct Modulation of a 1.3-μm InGaAlAs-Based DFB Laser With a Ridge Waveguide Structure
Wataru Kobayashi,Tsuyoshi Ito,Takayuki Yamanaka,Takeshi Fujisawa,Yasuo Shibata,Takeshi Kurosaki,Masaki Kohtoku,Takashi Tadokoro,Hiroaki Sanjoh +8 more
TL;DR: In this paper, a 1.3-μm distributed-feedback laser with a ridge waveguide structure was used to achieve 50-Gb/s clear eye openings with a back-to-back configuration, and achieved a mean output power of over 5.0 dBm, and a dynamic extinction ratio of 4.5 dB.
Journal ArticleDOI
Design and Fabrication of 10-/40-Gb/s, Uncooled Electroabsorption Modulator Integrated DFB Laser With Butt-Joint Structure
Wataru Kobayashi,Masakazu Arai,Takayuki Yamanaka,Naoki Fujiwara,Takeshi Fujisawa,T. Tadokoro,Ken Tsuzuki,Yasuhiro Kondo,Fumiyoshi Kano +8 more
TL;DR: In this article, a wide temperature range operation of an electroabsorption modulator (EAM) integrated with DFB laser diodes (LDs) (EML) designed to reduce the power consumption and size of optical transmitters was described.
Proceedings ArticleDOI
Transmission of 214-Gbit/s 4-PAM signal using an ultra-broadband lumped-electrode EADFB laser module
Shigeru Kanazawa,Hiroshi Yamazaki,Yasuhiko Nakanishi,Takeshi Fujisawa,Kiyoto Takahata,Yuta Ueda,Wataru Kobayashi,Yoshifumi Muramoto,Hiroyuki Ishii,Hiroaki Sanjoh +9 more
TL;DR: Using a lumped-electrode EADFB laser with a modulation bandwidth of ~59 GHz, this work demonstrated single-wavelength single-polarization direct-detection 4-PAM transmission with the record net data rate of 200 Gbit/s.
Journal ArticleDOI
On the Complexity Reduction of the Second-Order Volterra Nonlinear Equalizer for IM/DD Systems
Nikolaos-Panteleimon Diamantopoulos,Hidetaka Nishi,Wataru Kobayashi,Koji Takeda,Takaaki Kakitsuka,Shinji Matsuo +5 more
TL;DR: A theoretical analysis on the Volterra nonlinear equalizer (VNLE) is provided, focusing on computational complexity aspects, which yields a simple reduced-complexity scheme for the second-order VNLE (R2-VNL) based on a performance-complexities tradeoff.