Fast Single-Mode Fiber Nonlinearity Monitoring: An Experimental Comparison Between Split-Step and Nonlinear Fourier Transform-Based Methods

Pascal De Koster*, Olaf Schulz, Jonas Koch, Stephan Pachnicke, Sander Wahls

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
131 Downloads (Pure)

Abstract

We experimentally investigate the problem of monitoring the Kerr-nonlinearity coefficient $\gamma$ from transmitted and received data for a single-mode fiber link of 1600 km length. We compare the accuracy and speed of three different approaches. First, a standard split-step Fourier method is used to predict the output at various $\gamma$ values, which are then compared to the measured output. Second, a recently proposed nonlinear Fourier transform (NFT)-based method, which matches solitonic eigenvalues in the transmitted and received signals for various $\gamma$ values. Third, a novel fast version of the NFT-based method, which only matches the highest few eigenvalues. Although the NFT-based methods do not scale with link length, we demonstrate that the SSFM-based method is significantly faster than the basic NFT-based method for the considered link of 1600 km, and outperforms even the faster version. However, for a simulated link of 8000 km, the fast NFT-based method is shown to be faster than the SSMF-based method, although at the cost of a small loss in accuracy.

Original languageEnglish
Article number7202313
Number of pages13
JournalIEEE Photonics Journal
Volume15
Issue number6
DOIs
Publication statusPublished - 2023

Keywords

  • characterization
  • forward scattering transform
  • Kerr-nonlinearity
  • nonlinear Fourier transform
  • nonlinear Schrödinger equation
  • Single-mode fiber
  • solitons
  • split-step Fourier method

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