Kernel adaptive filtering-based phase noise compensation for pilot-free optical phase conjugated coherent systems

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 nu...

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Bibliographic Details
Published inOptics express Vol. 30; no. 11; pp. 19479 - 19493
Main Authors Boscolo, Sonia, Nguyen, Tu T., Ali, Abdallah A. I., Sygletos, Stylianos, Ellis, Andrew D.
Format Journal Article
LanguageEnglish
Published 23.05.2022
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Summary: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.
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ISSN:1094-4087
1094-4087
DOI:10.1364/OE.456963