Online digital compensation of phase and amplitude distortions in cascaded FOPA transmission links

Long Hoang Nguyen, Sonia Boscolo, Stylianos Sygletos

Research output: Unpublished contribution to conferencePosterpeer-review


Today mitigating stimulated Brillouin scattering (SBS) remains a significant challenge for the eventual penetration of fibre-optical parametric amplifiers (FOPAs) into future communication systems. The pump phase modulation that is often used for SBS mitigation causes temporal variation of the parametric gain, which is primarily a source of phase distortion for coherently detected quadrature-amplitude modulation (QAM) signals. Here, we introduce a new and fully online digital signal processing (DSP) scheme that enables compensation of the intrinsic dithering-induced phase distortion and its conversion into amplitude distortion when interacting with the dispersive fibre channel in transmission systems with cascaded FOPAs operating with multi-tone pump dithering to support sufficient SBS-limited gain. Through extensive numerical simulations, we identify the required dimensioning for performance improvement and evaluate the scheme's robustness against non-ideal conditions. We demonstrate that enhancing a conventional DSP chain with the proposed algorithm achieves significant performance benefits in 28-Gbaud 16-QAM transmission. We believe that our scheme may become a key component of future FOPA-amplified links, where pump dithering will be necessary to achieve high amplification gains.
Original languageEnglish
Publication statusPublished - 21 Feb 2024
EventTelecommunications, Optics & Photonics (TOP) Conference 2024 - London, United Kingdom
Duration: 21 Feb 202422 Feb 2024


ConferenceTelecommunications, Optics & Photonics (TOP) Conference 2024
Abbreviated titleTOP 2024
Country/TerritoryUnited Kingdom
Internet address


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