Digital compensation of residual pump dithering in optical phase conjugation of high-order QAM

T. T. Nguyen, S. Boscolo*, A. A.I. Ali, M. Tan, S. Sygletos, S. Takasaka, R. Sugizaki, A. D. Ellis

*Corresponding author for this work

Research output: Chapter in Book/Published conference outputConference publication

Abstract

We develop a new two-stage digital scheme to suppress the phase distortion due to
residual pump dithering in the dual-pump fibre-based optical phase conjugation of high-order (64/256) QAM signals. We show more than 5-dB SNR improvement relative to conventional phase-noise compensation at high pump-phase mismatch levels.
Original languageEnglish
Title of host publication2021 Optical Fiber Communications Conference and Exhibition (OFC)
Number of pages3
ISBN (Electronic)978-1-943580-86-6
Publication statusPublished - 26 Jul 2021
Event2021 Optical Fiber Communications Conference and Exhibition (OFC) - San Francisco, CA, USA
Duration: 6 Jun 202110 Jun 2021

Publication series

NameOptics InfoBase Conference Papers

Conference

Conference2021 Optical Fiber Communications Conference and Exhibition (OFC)
Period6/06/2110/06/21

Bibliographical note

Funding Information:
We have developed a new two-stage DSP scheme to compensate the phase distortion induced by deviations from ideal pump counter-phasing for dual-pump OPC of high-order QAM signals. We have demonstrated numerically and experimentally that the proposed approach achieves large SNR improvement relative to conventional PN compensation when it is used with 64/256-QAM signals in the presence of severe imperfections in the pump-modulation scheme. We believe that this technique may firstly allow the applied pump dithering to be increased, improving the conversion efficiency and secondly, reduce residual dithering penalties for OPC systems with lower optical SNR penalties. The adaptation of our PN compensation algorithm to OPC-assisted transmission setups is a subject of ongoing research. Acknowledgements: This work was supported by the UK EPSRC - Grants EP/S003436/1, EP/S016171/1 and EP/R035342/1. References 4. S. Randel et al., IEEE Photon. Technol. Lett. 22, 1288–1290 (2010).

Publisher Copyright:
© OSA 2021, © 2021 The Author(s)

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