TY - JOUR
T1 - Multi-Rate Nyquist-SCM for C-Band 100 Gbit/s Signal Over 50 km Dispersion-Uncompensated Link
AU - Wang, Haide
AU - Zhou, Ji
AU - Wei, Jinlong
AU - Guo, Dong
AU - Feng, Yuanhua
AU - Liu, Weiping
AU - Yu, Changyuan
AU - Wang, Dawei
AU - Li, Zhaohui
N1 - Publisher Copyright:
© 2022 IEEE.
PY - 2022/4/1
Y1 - 2022/4/1
N2 - In this paper, to the best of our knowledge, we propose the first multi-rate Nyquist-subcarriers modulation (SCM) for C-band 100 Gbit/s signal transmission over 50 km dispersion-uncompensated link. Chromatic dispersion (CD) introduces severe spectral nulls on optical double-sideband signal, which greatly degrades the performance of intensity-modulation and direct-detection systems. Based on the prior knowledge of the dispersive channel, Nyquist-SCM with multi-rate subcarriers is proposed to keep away from the CD-caused spectral nulls flexibly. Signal on each subcarrier can be individually recovered by a digital signal processing, including the feed-forward equalizer with no more than 31 taps, a two-tap post filter, and maximum likelihood sequence estimation with one memory length. Combining with entropy loading based on probabilistic constellation shaping to maximize the capacity-reach, the C-band 100 Gbit/s multi-rate Nyquist-SCM signal over 50 km dispersion-uncompensated link can achieve 7% hard-decision forward error correction limit and average normalized generalized mutual information of 0.967 at received optical power of -4 dBm and optical signal-to-noise ratio of 47.67 dB. In conclusion, the multi-rate Nyquist-SCM shows great potentials in solving the CD-caused spectral distortions.
AB - In this paper, to the best of our knowledge, we propose the first multi-rate Nyquist-subcarriers modulation (SCM) for C-band 100 Gbit/s signal transmission over 50 km dispersion-uncompensated link. Chromatic dispersion (CD) introduces severe spectral nulls on optical double-sideband signal, which greatly degrades the performance of intensity-modulation and direct-detection systems. Based on the prior knowledge of the dispersive channel, Nyquist-SCM with multi-rate subcarriers is proposed to keep away from the CD-caused spectral nulls flexibly. Signal on each subcarrier can be individually recovered by a digital signal processing, including the feed-forward equalizer with no more than 31 taps, a two-tap post filter, and maximum likelihood sequence estimation with one memory length. Combining with entropy loading based on probabilistic constellation shaping to maximize the capacity-reach, the C-band 100 Gbit/s multi-rate Nyquist-SCM signal over 50 km dispersion-uncompensated link can achieve 7% hard-decision forward error correction limit and average normalized generalized mutual information of 0.967 at received optical power of -4 dBm and optical signal-to-noise ratio of 47.67 dB. In conclusion, the multi-rate Nyquist-SCM shows great potentials in solving the CD-caused spectral distortions.
KW - Chromatic dispersion
KW - intensity-modulation and direct-detection systems
KW - multi-rate Nyquist-SCM
KW - probabilistic constellation shaping
UR - http://www.scopus.com/inward/record.url?scp=85120571948&partnerID=8YFLogxK
U2 - 10.1109/JLT.2021.3131603
DO - 10.1109/JLT.2021.3131603
M3 - Article
AN - SCOPUS:85120571948
SN - 0733-8724
VL - 40
SP - 1930
EP - 1936
JO - Journal of Lightwave Technology
JF - Journal of Lightwave Technology
IS - 7
ER -