Abstract
We propose a kernel-based adaptive filtering method to suppress the phase noise (PN) arising from small deviations from ideal counter-phasing in the dual-pump fibre-based optical phase conjugation (OPC) of pilot-free quadrature-amplitude modulation (QAM) signals. We demonstrate experimentally and numerically that the proposed scheme achieves signal-to-noise ratio improvement over conventional PN compensation under optimised pump dithering settings in the OPC device and features no performance penalty across a range of pump-phase mismatch values, when it is used with a 16-QAM signal in an optical back-to-back configuration. We also illustrate the applicability of the method to the 64-QAM modulation format, and evaluate its performance in a transmission setup with mid-link OPC by means of numerical simulations.
| Original language | English |
|---|---|
| Pages (from-to) | 19479-19493 |
| Number of pages | 15 |
| Journal | Optics Express |
| Volume | 30 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - 23 May 2022 |
Bibliographical note
Published by Optica Publishing Group under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.Funding: UK Engineering and Physical Sciences Research Council ( EP/S003436/1 (PHOS), EP/S016171/1 (EEMC),
EP/R035342/1 (TRANSNET)).