Y
Yohei Sakamaki
Researcher at Nippon Telegraph and Telephone
Publications - 64
Citations - 799
Yohei Sakamaki is an academic researcher from Nippon Telegraph and Telephone. The author has contributed to research in topics: Waveguide (optics) & Radiation mode. The author has an hindex of 15, co-authored 64 publications receiving 758 citations.
Papers
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Patent
Flat optical circuit, design method for wave motion propagating circuit and computer program
Takashi Saida,Munehisa Tamura,Yohei Sakamaki,Toshikazu Hashimoto,Kito Tsutomu,Hiroshi Takahashi,Masahiro Yanagisawa,Senichi Suzuki,Yasuhiro Hida,Motohaya Ishii +9 more
TL;DR: In this paper, a planar lightwave circuit is provided which can be easily fabricated by an existing planar-lightwave-circuit fabrication process, which can lower the propagation loss of signal light and which can convert inputted signal light so as to derive desired signal light.
Patent
Optical dqpsk receiver and phase control method thereof
Kuninori Hattori,Yusuke Nasu,Toshikazu Hashimoto,Yohei Sakamaki,Eiji Yoshida,Hiroto Kawakami +5 more
TL;DR: In this paper, the authors proposed a phase control method for an optical DQPSK receiver using a Costas loop, and a phase adjuster was used to control the phase adjusters.
Patent
Optical switch system
Yohei Sakamaki,Mitsunori Fukutoku,Tomoyoshi Kataoka,Tetsuo Takahashi,Sawara Akio,Shunichi Soma +5 more
TL;DR: An optical switch system is composed of a plurality of optical switches, and includes a mechanism that can change an optical connection method between the optical switches and an optical switch module control section as discussed by the authors.
Journal ArticleDOI
Compact and Athermal DQPSK Demodulator with Silica-Based Planar Lightwave Circuit
Yusuke Nasu,Yohei Sakamaki,Kuninori Hattori,Shin Kamei,Toshikazu Hashimoto,Takashi Saida,Hiroshi Takahashi,Yasuyuki Inoue +7 more
TL;DR: A polarizationindependent athermal differential quadrature phase shift keying (DQPSK) demodulator that employs silica-based planar lightwave circuit (PLC) technology is presented and its long-term reliability and thermal stability against the rapid temperature change are verified.
Patent
Planar lightwave circuit, including an optical branch circuit
Takashi Saida,Munehisa Tamura,Yohei Sakamaki,Toshikazu Hashimoto,Kito Tsutomu,Hiroshi Takahashi,Masahiro Yanagisawa,Senichi Suzuki,Yasuhiro Hida,Motohaya Ishii +9 more
TL;DR: In this paper, a planar lightwave circuit is provided which can be easily fabricated by an existing planar-lightwave-circuit fabrication process, which can lower the propagation loss of signal light and which can convert inputted signal light so as to derive desired signal light.