TY - JOUR
T1 - Subband pairwise coding for robust Nyquist-WDM superchannel transmission
AU - Zhu, Chen
AU - Song, Binhuang
AU - Zhuang, Leimeng
AU - Corcoran, Bill
AU - Lowery, Arthur
PY - 2016
Y1 - 2016
N2 - Nyquist wavelength-division-multiplexed coherent optical superchannel systems closely pack a set of rectangularshaped channels to realize high-spectral-efficiency transmission. In long-haul fiber links, dividing each of these channels into multiple subbands, each a few-gigahertz wide, can increase tolerance to fiber nonlinearity. However, these low-bandwidth subbands will be sensitive to laser drift, which could cause them to overlap, creating interchannel interference (ICI). In this paper, we propose the application of pairwise precoding across the middle and edge subbands to improve their ICI tolerance. The proposed scheme is verified in superchannel experiments, and shows about 1.5-dB Q2 improvement after 3840-km transmission for QPSK modulation and 1-dB Q2 gain with 16-QAM modulation after 800-km transmission.
AB - Nyquist wavelength-division-multiplexed coherent optical superchannel systems closely pack a set of rectangularshaped channels to realize high-spectral-efficiency transmission. In long-haul fiber links, dividing each of these channels into multiple subbands, each a few-gigahertz wide, can increase tolerance to fiber nonlinearity. However, these low-bandwidth subbands will be sensitive to laser drift, which could cause them to overlap, creating interchannel interference (ICI). In this paper, we propose the application of pairwise precoding across the middle and edge subbands to improve their ICI tolerance. The proposed scheme is verified in superchannel experiments, and shows about 1.5-dB Q2 improvement after 3840-km transmission for QPSK modulation and 1-dB Q2 gain with 16-QAM modulation after 800-km transmission.
UR - https://www.scopus.com/pages/publications/84963615011
U2 - 10.1109/JLT.2015.2510362
DO - 10.1109/JLT.2015.2510362
M3 - Article
SN - 0733-8724
VL - 34
SP - 1746
EP - 1753
JO - Journal of Lightwave Technology
JF - Journal of Lightwave Technology
IS - 8
ER -