Yoko Yamashita
Hokkaido University
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Publication
Featured researches published by Yoko Yamashita.
Journal of Lightwave Technology | 2017
Yoko Yamashita; Takeshi Fujisawa; Shuntaro Makino; Nobutomo Hanzasa; Taiji Sakamoto; Takashi Matsui; Kyozo Tsujikawa; Fumihiko Yamamoto; Kazuhide Nakajima; Kunimasa Saitoh
A broadband and low-loss two-mode (LP01/LP11a) multi/demultiplexer (MUX/DEMUX) based on a planar lightwave circuit (PLC) is designed by a wavefront matching method, which is an optimization algorithm of PLC based on the beam propagation method. The calculated transmission loss of the optimized structure is lower than −0.3 dB in the wavelength range from 1400 to 1700 nm. Numerical results show that the proposed structure has large fabrication tolerance compared to the conventional structure. The designed structure is fabricated and broadband characteristics are well-reproduced, showing the usefulness of the proposed MUX/DEMUX.
Frontiers in Optics | 2015
Yoko Yamashita; Shuntaro Makino; Takeshi Fujisawa; Kunimasa Saitoh; Nobutomo Hanzawa; Taiji Sakamoto; Takashi Matsui; Kyozo Tsujikawa; Fumihiko Yamamoto
A broadband, large fabrication tolerance LP01/LP11 PLC-based mode multi/demultiplexer design is presented by using wavefront mathing method. The low-loss bandwidth of the optimized structure is 4-times wider than that of conventional structure.
IEEE Photonics Technology Letters | 2017
Yoko Yamashita; Shuntaro Makino; Takeshi Fujisawa; Nobutomo Hanzawa; Taiji Sakamoto; Takashi Matsui; Kyozo Tsujikawa; Fumihiko Yamamoto; Kazuhide Nakajima; Kunimasa Saitoh
A compact and low-loss PLC-based mode rotator is proposed. The mode rotator with the curved trench structure is designed based on the wavefront matching method, which is an optimization algorithm based on the beam propagation method. The proposed mode rotator is 45% in size (1 mm) and has lower loss (1/5) compared with the conventional structure that has a straight trench. Furthermore, the proposed mode rotator can achieve low-mode crosstalk.
Optical Fiber Technology | 2017
Kunimasa Saitoh; Nobutomo Hanzawa; Taiji Sakamoto; Takeshi Fujisawa; Yoko Yamashita; Takashi Matsui; Kyozo Tsujikawa; Kazuhide Nakajima
Journal of Lightwave Technology | 2018
Takeshi Fujisawa; Yoko Yamashita; Taiji Sakamoto; Takashi Matsui; Kyozo Tsujikawa; Kazuhide Nakajima; Kunimasa Saitoh
IEICE Transactions on Electronics | 2018
Eri Taguchi; Takeshi Fujisawa; Yoko Yamashita; Shuntaro Makino; Nobutomo Hanzawa; Taiji Sakamoto; Takashi Matsui; Kyozo Tsujikawa; Kazuhide Nakajima; Fumihiko Yamamoto; Kunimasa Saitoh
optical fiber communication conference | 2017
Takeshi Fujisawa; Eri Taguchi; Taiji Sakamoto; Takashi Matsui; Yoko Yamashita; Kyozo Tsujikawa; Kazuhide Nakajima; Kunimasa Saitoh
optical fiber communication conference | 2017
Takeshi Fujisawa; Yoko Yamashita; Taiji Sakamoto; Takashi Matsui; Shuntaro Makino; Kyozo Tsujikawa; Kazuhide Nakajima; Kunimasa Saitoh
international conference on photonics in switching | 2016
Yoko Yamashita; Yuhei Ishizaka; Nobutomo Hanzawa; Takeshi Fujisawa; Taiji Sakamoto; Takashi Matsui; Kyozo Tsujikawa; Fumihiko Yamamoto; Kazuhide Nakajima; Kunimasa Saitoh
ieee photonics conference | 2016
Yoko Yamashita; Shuntaro Makino; Takeshi Fujisawa; Kunimasa Saitoh; Nobutomo Hanzawa; Taiji Sakamoto; Takashi Matsui; Kyozo Tsujikawa; Fumihiko Yamamoto; Kazuhide Nakajima
