Open AccessSuper-Nyquist-WDM transmission over 7,326-km seven-core fiber with capacity-distance product of 103 Exabit/s·km
Author(s) -
Koji Igarashi,
Takehiro Tsuritani,
Ramon Casellas,
Yukihiro Tsuchida,
Koichi Maeda,
Masateru Tadakuma,
Tsunetoshi Saito,
Kazuhiro Watanabe,
Katsunori Imamura,
Ryuichi Sugizaki,
Masatoshi Suzuki
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.001220
Subject(s) - optics , wavelength division multiplexing , channel spacing , nyquist–shannon sampling theorem , physics , terabit , multiplexing , transmission (telecommunications) , bandwidth (computing) , telecommunications , computer science , wavelength , electronic engineering , engineering
We show super-Nyquist-WDM transmission technique, where optical signals with duobinary-pulse shaping can be wavelength-multiplexed with frequency spacing of below baudrate. Duobinary-pulse shaping can reduce the signal bandwidth to be a half of baudrate while controlling inter-symbol interference can be compensated by the maximum likelihood sequence estimation in a receiver. First, we experimentally evaluate crosstalk characteristics as a function of channel spacing between the dual-channel DP-QPSK signals with duobinary-pulse shaping. As a result, the crosstalk penalty can be almost negligible as far as the ratio of baudrate to frequency spacing is maintained to be less than 1.20. Next, we demonstrate 140.7-Tbit/s, 7,326-km transmission of 7 × 201-channel 25-GHz-spaced super-Nyquist-WDM 100-Gbit/s optical signals using seven-core fiber and full C-band seven-core EDFAs. To the best of our knowledge, this is one of the first reports of high-capacity transmission experiments with capacity-distance product in excess of 1 Exabit/s · km.