TY - JOUR
T1 - Fast Single-Mode Fiber Nonlinearity Monitoring
T2 - An Experimental Comparison Between Split-Step and Nonlinear Fourier Transform-Based Methods
AU - De Koster, Pascal
AU - Schulz, Olaf
AU - Koch, Jonas
AU - Pachnicke, Stephan
AU - Wahls, Sander
PY - 2023
Y1 - 2023
N2 - 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.
AB - 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.
KW - characterization
KW - forward scattering transform
KW - Kerr-nonlinearity
KW - nonlinear Fourier transform
KW - nonlinear Schrödinger equation
KW - Single-mode fiber
KW - solitons
KW - split-step Fourier method
UR - http://www.scopus.com/inward/record.url?scp=85174812619&partnerID=8YFLogxK
U2 - 10.1109/JPHOT.2023.3322635
DO - 10.1109/JPHOT.2023.3322635
M3 - Article
AN - SCOPUS:85174812619
SN - 1943-0655
VL - 15
JO - IEEE Photonics Journal
JF - IEEE Photonics Journal
IS - 6
M1 - 7202313
ER -