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Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Yasushi Sakuma.
IEEE Photonics Technology Letters | 2015
K. Nakahara; Yuki Wakayama; Takeshi Kitatani; Takafumi Taniguchi; Toshihiko Fukamachi; Yasushi Sakuma; Shigehisa Tanaka
Direct modulation at 56 and 50 Gb/s of 1.3-μm InGaAlAs ridge-shaped-buried heterostructure (RS-BH) asymmetric corrugation-pitch-modulation (ACPM) distributed feedback lasers is experimentally demonstrated. The fabricated lasers have a low threshold current (5.6 mA at 85°C), high temperature characteristics (71 K), high slope relaxation frequency (3.2 GHz/mA1/2 at 85°C), and wide bandwidth (22.1 GHz at 85°C). These superior properties enable the lasers to run at 56 Gb/s and 55°C and 50 Gb/s at up to 80°C for backto-back operation with clear eye openings. This is achieved by the combination of a low-leakage RS-BH and an ACPM grating. Moreover, successful transmission of 56and 50-Gb/s modulated signals over a 10-km standard single-mode fiber is achieved. These results confirm the suitability of this type of laser for use as a cost-effective light source in 400 GbE and OTU5 applications.
international semiconductor laser conference | 2006
S. Sumi; Kazuhiko Naoe; Yasushi Sakuma; Ryu Washino; Kaoru Okamoto; Katsuya Motoda; H. Sato; K. Shinoda; T. Kitatani; A. Taike; K. Uomi
We successfully demonstrated 10.7-Gbit/s operation of 1.55-mum EA/DFB lasers for 80 km transmission at 50degC for the first time. As a result, a clearly opened eye, 1.9 dB power penalty were obtained
international semiconductor laser conference | 2014
K. Nakahara; Yuki Wakayama; Takeshi Kitatani; Takafumi Taniguchi; Toshihiko Fukamachi; Yasushi Sakuma; S. Tanaka
Direct modulation at 50 Gb/s of 1.3-μm InGaAlAs DFB lasers operating at up to 80°C was experimentally demonstrated by using a ridge-shaped buried heterostructure.
optical fiber communication conference | 2006
H. Singh; Katsuya Motoda; Masaru Mukaikubo; Kaoru Okamoto; Ryu Washino; Yasushi Sakuma; Kenji Uchida; H. Yamamoto; K. Uomi; K. Nakahara; Masaaki Aoki
We report a wide temperature range (-20/spl deg/C/spl sim/100/spl deg/C), uncooled operation of a direct-modulation 1.3 /spl mu/m, InGaAlAs MQW DFB laser diode with the highest-ever relaxation frequency (>20 GHz at 100/spl deg/C) and high mask margin for 10.7 Gbit/s SONET applications.
optical fiber communication conference | 2013
A. Nakanishi; Noriko Sasada; Yasushi Sakuma; Ryu Washino; Kaoru Okamoto; Kazuhiko Naoe; Hiroaki Hayashi; Hideo Arimoto; Shigehisa Tanaka
Uncooled InP-Mach-Zehnder modulator monolithically integrated with SOA was demonstrated for 10.7 Gbit/s 1600 ps/nm transmission at C-band wavelengths. Output power was obtained over +3.2 dBm at 0-85°C with +2 dBm optical input by using SOA.
optical fiber communication conference | 2014
K. Nakahara; Yuki Wakayama; Takeshi Kitatani; Takafumi Taniguchi; Toshihiko Fukamachi; Yasushi Sakuma; Shigehisa Tanaka
optical fiber communication conference | 2013
K. Nakahara; Yuki Wakayama; Kenji Hiruma; Takeshi Kitatani; Kazunori Shinoda; Toshihiko Fukamachi; Yasushi Sakuma; Shigehisa Tanaka
optical fiber communication conference | 2015
Takayuki Nakajima; Toshihiko Fukamachi; Mitsuo Akashi; Atsushi Nakamura; Yasushi Sakuma; Shigenori Hayakawa; Ryu Washino; Masaru Mukaikubo; Kaoru Okamoto; Katsuya Motoda; Kazuhiko Naoe; K. Nakahara; Shigehisa Tanaka; K. Uomi
Archive | 2015
Koichiro Adachi; Takanori Suzuki; Yasushi Sakuma; Kazuhiko Naoe; Akira Nakanishi
optical fiber communication conference | 2014
Toshihiko Fukamachi; Atsushi Nakamura; Yasushi Sakuma; Shigenori Hayakawa; Ryu Washino; Masaru Mukaikubo; Kaoru Okamoto; Takayuki Nakajima; Katsuya Motoda; Kazuhiko Naoe; K. Nakahara; Yuki Wakayama; K. Uomi
