4.7 Article

Multi-Rate Nyquist-SCM for C-Band 100 Gbit/s Signal Over 50 km Dispersion-Uncompensated Link

Journal

JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 40, Issue 7, Pages 1930-1936

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2021.3131603

Keywords

Chromatic dispersion; intensity-modulation and direct-detection systems; multi-rate Nyquist-SCM; probabilistic constellation shaping

Funding

  1. National Key R&D Program of China [2019YFB1803500]
  2. National Natural Science Foundation of China [62005102, U2001601]
  3. Natural Science Foundation of Guangdong Province [2019A1515011059]
  4. Guangzhou Basic and Applied Basic Research Foundation [202102020996]
  5. Fundamental Research Funds for the Central Universities [21619309]
  6. Open Fund of IPOC (BUPT) [IPOC2019A001]

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This paper proposes the first multi-rate Nyquist-subcarriers modulation for C-band 100 Gbit/s signal transmission and demonstrates its great potential in solving spectral distortions caused by chromatic dispersion.
In this paper, to the hest of our knowledge, we propose the first multi-rate Nyquist-subcarriers modulation (SCM) for C-band 100 Gbit/s signal transmission over 50 km dispersionun-compensated 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 he individually recovered by a digital signal processing, including the feed-forward equalizer with no more than 31 taps, a two-tap past 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.

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