Junichi Abe
NEC
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Publication
Featured researches published by Junichi Abe.
Optics Express | 2011
Etsushi Yamazaki; Shogo Yamanaka; Yoshiaki Kisaka; Tadao Nakagawa; Koichi Murata; Eiji Yoshida; Toshikazu Sakano; Masahito Tomizawa; Yutaka Miyamoto; Shinji Matsuoka; Junichiro Matsui; Atsufumi Shibayama; Junichi Abe; Yuichi Nakamura; Hidemi Noguchi; Kiyoshi Fukuchi; Hiroshi Onaka; Katsumi Fukumitsu; Kousuke Komaki; Osamu Takeuchi; Yuichiro Sakamoto; Hisao Nakashima; Takashi Mizuochi; Kazuo Kubo; Yoshikuni Miyata; Hiroshi Nishimoto; Susumu Hirano; Kiyoshi Onohara
A field trial of 100-Gbit/s Ethernet over an optical transport network (OTN) is conducted using a real-time digital coherent signal processor. Error free operation with the Q-margin of 3.2 dB is confirmed at a 100 Gbit/s Ethernet analyzer by concatenating a low-density parity-check code with a OTN framer forward error correction, after 80-ch WDM transmission through 6 spans x 70 km of dispersion shifted fiber without inline-dispersion compensation. Also, the recovery time of 12 msec is observed in an optical route switching experiment, which is achieved through fast chromatic dispersion estimation functionality.
european conference on optical communication | 2010
Kiyoshi Fukuchi; Daisaku Ogasahara; J. Hu; T. Takamichi; Tadashi Koga; Masaki Sato; E. L. T. de Gabory; Yoichi Hashimoto; T. Yoshihara; Wakako Maeda; Junichi Abe; T. Kwok; Y. Huang; K. Hosokawa; Yutaka Yano; M. Shigihara; Y. Ueki; Y. Saito; Y. Nomiyama; K. Kikuchi; Arihide Noda; Satomi Shioiri; Manabu Arikawa; T. Wang; Tsutomu Tajima
We demonstrate 112Gb/s transmission using PM-QPSK format and FPGA-based real-time digital signal processing. By employing framed processing architecture for polarization demultiplexing and carrier phase estimation, stable operation of error free after FEC and wide frequency offset have been achieved.
optical fiber communication conference | 2015
Emmanuel Le Taillandier de Gabory; Tatsuya Nakamura; Hidemi Noguchi; Wakako Maeda; S. Fujita; Junichi Abe; Kiyoshi Fukuchi
We evaluated experimentally 2, 8, 32 state 32Gbaud TCM-QPSK and TCM-16QAM. TCM offers finer configuration for flexible transponders increasing SE, on 1.1dB wider ranges. TCM may also be used with HD-FEC in lower power transceivers.
european conference on optical communication | 2015
Tatsuya Nakamura; Emmanuel Le Taillandier de Gabory; Hidemi Noguchi; Wakako Maeda; Junichi Abe; Kiyoshi Fukuchi
We propose a new 4D coded modulation format, 64SP-12QAM, with same SE as PM-8QAM and straightforwardly-switchable with PM-16QAM. We experimentally demonstrated over 0.2 dB better sensitivity for 64SP-12QAM compared to PM-8QAM, enabling a transmission reach extension to 6,000 km at 6b/s/Hz.
optical fiber communication conference | 2012
Wakako Maeda; Daisaku Ogasahara; Junichi Abe; Shinsuke Fujisawa; E. L. T. de Gabory; Toshiharu Ito; Kiyoshi Fukuchi
We propose a hardware-efficient polarization demultiplexing algorithm suitable for QAM signals, which is based on dual decision-directed algorithm. Our algorithm requires only half size hardware of a conventional double stage algorithm based on CMA.
opto electronics and communications conference | 2015
Tatsuya Nakamura; Hidemi Noguchi; Emmanuel Le Taillandier de Gabory; Wakako Maeda; Junichi Abe; Kiyoshi Fukuchi
We propose multi-redundancy optical coded modulation using superposed trellis. We experimentally prove that our scheme enables fine adaptive SE control and high coding gain of 7.1dB for 3-bit redundant 16QAM with quarterly reduced circuit complexity.
european conference on optical communication | 2008
Nobuhide Yoshida; Hidemi Noguchi; Junichi Abe; H. Uchida; M. Ozaki; S. Kanemitsu; Shigeki Wada; Yasushi Amamiya
We propose a high-speed and simple estimation algorithm of waveform distortions using a 43-Gb/s SiGe-based eye-monitoring LSI, and experimentally demonstrate precise estimations of PMD and chromatic dispersion.
asia-pacific conference on communications | 2015
Emmanuel Le Taillandier de Gabory; Tatsuya Nakamura; Hidemi Noguchi; Wakako Maeda; S. Fujita; Junichi Abe; Kiyoshi Fukuchi
We demonstrated experimentally the improvement of the transmission distance by 27% of 150Gb/s signal at 3b/s/Hz with a novel TCM format, 8-state 12QAM TCM, compared to PM-8QAM. We also demonstrated improvement of the transmission distance for multiple state TCM using nonlinear compensation, ranging from 14% to 26%, while similar improvement was below 11% for PM signals.
european conference on optical communication | 2008
Junichi Abe; Nobuhide Yoshida; Hidemi Noguchi; S. Kanemitsu; H. Uchida; M. Ozaki; Shigeki Wada; Yasushi Amamiya
We propose an adaptive electrical dispersion compensation using newly developed high-speed eye monitoring LSI, and demonstrated experimentally the effective enlargement of PMD tolerance in 43 Gbit/s RZ-DPSK signal.
Archive | 2014
Junichi Abe; Wakako Yasuda; Kiyoshi Fukuchi