Comparison of Short Blocklength Sphere Shaping and Nonlinearity Compensation in WDM Systems

Abdelkerim Amari (Corresponding author), Lutz Lampe, Sunish Kumar Orappanpara Soman, Yunus Can Gultekin, Alex Alvarado

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

In optical communication systems, short blocklength probabilistic enumerative sphere shaping (ESS) provides both linear shaping gain and nonlinear tolerance. In this work, we investigate the performance and complexity of ESS in comparison with fiber nonlinearity compensation via digital back propagation (DBP) with different steps per span. We evaluate the impact of the shaping blocklength in terms of nonlinear tolerance and also consider the case of ESS with a Volterra-based nonlinear equalizer (VNLE), which provides lower complexity than DBP. In single-channel transmission, ESS with VNLE achieves similar performance in terms of finite length bit-metric decoding rate to uniform signaling with one step per span DBP. In the context of a dense wavelength-division multiplexing (WDM) transmission system, we show that ESS outperforms uniform signaling with DBP for different step sizes.

Original languageEnglish
Article number9222115
Pages (from-to)1435-1438
Number of pages4
JournalIEEE Photonics Technology Letters
Volume32
Issue number22
DOIs
Publication statusPublished - 15 Nov 2020

Keywords

  • Digital back propagation
  • enumerative sphere shaping
  • fiber nonlinearity compensation
  • optical communication systems
  • probabilistic shaping
  • Volterra series

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