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


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.

Divisions: College of Engineering & Physical Sciences > Aston Institute of Photonics Technology (AIPT)
College of Engineering & Physical Sciences
Additional Information: 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)
Event Title: 2021 Optical Fiber Communications Conference and Exhibition (OFC)
Event Type: Other
Event Location: San Francisco, CA, USA
Event Dates: 2021-06-06 - 2021-06-10
Uncontrolled Keywords: Electronic, Optical and Magnetic Materials,Mechanics of Materials
ISBN: 978-1-6654-2938-2, 978-1-943580-86-6
Last Modified: 21 Nov 2023 12:47
Date Deposited: 02 Aug 2021 14:34
Full Text Link:
Related URLs: https://ieeexpl ... ocument/9489676 (Publisher URL)
https://opg.opt ... 021-M3I.4&seq=0 (Publisher URL)
PURE Output Type: Conference contribution
Published Date: 2021-07-26
Accepted Date: 2021-06-01
Authors: Nguyen, T. T.
Boscolo, S. (ORCID Profile 0000-0001-5388-2893)
Ali, A. A.I.
Tan, M. (ORCID Profile 0000-0002-0822-8160)
Sygletos, S. (ORCID Profile 0000-0003-2063-8733)
Takasaka, S.
Sugizaki, R.
Ellis, A. D. (ORCID Profile 0000-0002-0417-0547)



Version: Accepted Version

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