Kurtosis-limited Sphere Shaping for Nonlinear Interference Noise Reduction in Optical Channels

Yunus Can Gültekin (Corresponding author), Alex Alvarado, Olga Vassilieva, Inwoong Kim, Paparao Palacharla, Chigo M. Okonkwo, Frans M.J. Willems

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

17 Citaten (Scopus)
29 Downloads (Pure)


Nonlinear interference (NLI) generated during the propagation of an optical waveform through the fiber depends on the fourth order standardized moment of the channel input distribution, also known as kurtosis. Probabilistically-shaped inputs optimized for the linear Gaussian channel have a Gaussian-like distribution with high kurtosis. For optical channels, this leads to an increase in NLI power and consequently, a decrease in effective signal-to-noise ratio (SNR). In this work, we propose kurtosis-limited enumerative sphere shaping (K-ESS) as an algorithm to generate low-kurtosis shaped inputs. Numerical simulations at a shaping blocklength of 108 amplitudes demonstrate that with K-ESS, it is possible to increase the effective SNRs by 0.4 dB in a single-span single-channel scenario at 400 Gbit/s. K-ESS offers also a twofold decrease in frame error rate with respect to Gaussian-channel-optimal sphere shaping.

Originele taal-2Engels
Pagina's (van-tot)101-112
Aantal pagina's12
TijdschriftJournal of Lightwave Technology
Nummer van het tijdschrift1
Vroegere onlinedatum19 okt. 2021
StatusGepubliceerd - 1 jan. 2022


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