Abstract
Nonlinear phase noise (NLPN) is studied in an experimental wavelength division multiplexed (WDM) system operating at 256QAM. Extremely narrow linewidth lasers (<1 kHz) at the transmitter and the receiver allow for extracting the phase part of the nonlinear noise in a Raman amplified link. Based on the experimental data, the autocorrelation function of the NLPN is estimated and it matches the theoretical predictions. Several algorithms are examined as candidates for tracking and compensating the NLPN. It is shown that algorithms which exploit the distribution of the NLPN achieve higher gains than standard methods, which only exploit the correlation properties. Up to 300 km reach increase is achieved for a 5x10 GBaud WDM system with base distance of up to 1600 km. The gains are comparable to the gains of single channel digital back-propagation, with even further improvements from the combination of both techniques.
| Original language | English |
|---|---|
| Journal | Journal of Lightwave Technology |
| Volume | 35 |
| Issue number | 8 |
| Pages (from-to) | 1438 - 1443 |
| Number of pages | 6 |
| ISSN | 0733-8724 |
| DOIs | |
| Publication status | Published - 2017 |
Bibliographical note
(c) 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.Keywords
- Nonlinear phase noise
- Phase noise distribution
- Nonlinear compensation
- High-order QAM
- WDM