Super-Nyquist-WDM transmission over 7,326-km seven-core fiber with capacity-distance product of 1.03 Exabit/s · km

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 ca...

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Published in:Optics express 2014-01, Vol.22 (2), p.1220-1228
Main Authors: Igarashi, Koji, Tsuritani, Takehiro, Morita, Itsuro, Tsuchida, Yukihiro, Maeda, Koichi, Tadakuma, Masateru, Saito, Tsunetoshi, Watanabe, Kengo, Imamura, Katsunori, Sugizaki, Ryuichi, Suzuki, Masatoshi
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cited_by cdi_FETCH-LOGICAL-c1740-79b86644c53e7505f2fa0198f53e8dcf102a8780aad6835daa4ebe6b39bcf9743
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container_end_page 1228
container_issue 2
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container_title Optics express
container_volume 22
creator Igarashi, Koji
Tsuritani, Takehiro
Morita, Itsuro
Tsuchida, Yukihiro
Maeda, Koichi
Tadakuma, Masateru
Saito, Tsunetoshi
Watanabe, Kengo
Imamura, Katsunori
Sugizaki, Ryuichi
Suzuki, Masatoshi
description 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.
doi_str_mv 10.1364/OE.22.001220
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title Super-Nyquist-WDM transmission over 7,326-km seven-core fiber with capacity-distance product of 1.03 Exabit/s · km
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