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 - This work was supported in part by the National Key R&D Program of China under Grant 2019YFB1803500, in part by the National Natural Science Foundation of China under Grants 62005102 and U2001601, in part by the Natural Science Foundation of Guangdong Province under Grant 2019A1515011059, in part by Guangzhou Basic and Applied Basic Research Foundation under Grant 202102020996, in part by the Fundamental Research Funds for the Central Universities under Grant 21619309, and in part by the Open Fund of IPOC (BUPT) under Grant IPOC2019A001.
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 - Journal 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 -