Impact of pump phase modulation on QAM signals in polarization-insensitive fiber optical parametric amplifiers

Abstract

We examine mitigation of stimulated Brillouin scattering (SBS) in fiber optical parametric amplifiers (FOPAs) by pump phase modulation in the context of QAM signals and the state-of-art polarization-insensitive FOPA architecture. We characterize the impact of the pump phase modulation on QAM signals in the cases of single-polarization FOPAs and polarization-insensitive FOPAs, and study pathways to minimization of this impact. We find that the impact of pump phase modulation on signals is more complicated in polarization-insensitive FOPAs than in single-polarization FOPAs, and it can be mitigated by using the features of the polarization-insensitive FOPA architecture. We use the required optical signal to noise ratio (rOSNR) to evaluate the impact of pump phase modulation on QAM signals and find that the induced signal phase modulation makes significantly more contribution than the induced signal amplitude modulation. Our numerical and experimental study has revealed a distribution of the rOSNR penalty across the FOPA gain spectrum which is distinct from previously reported for on/off signals. We explore and optimize the pump phase modulation schemes to reduce the signal rOSNR penalty whilst providing more SBS mitigation at the same time. We demonstrate that a receiver digital signal processing plays a significant role in contribution to rOSNR penalty.

Publication DOI: https://doi.org/10.1016/j.yofte.2024.103758
Divisions: College of Engineering & Physical Sciences > Aston Institute of Photonics Technology (AIPT)
College of Engineering & Physical Sciences
Funding Information: We wish to thank Dr Shigehiro Takasaka and Dr Ryuichi Sugizaki of Furukawa Electric for highly nonlinear fibers, and Dr Charles Laperle of Ciena for the transponder. This work was funded by the EPSRC projects EP/S016171/1 (EEMC) and EP/T518128/1 (DTP). Da
Additional Information: Copyright © 2024 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY license (https://creativecommons.org/licenses/by/4.0/)
Uncontrolled Keywords: Optical fiber parametric amplifiers,Pump phase modulation,Pump dithering,QAM signals,polarization-insensitive FOPA
Publication ISSN: 1095-9912
Last Modified: 21 May 2024 12:52
Date Deposited: 15 Apr 2024 16:27
Full Text Link:
Related URLs: https://linking ... 068520024001032 (Publisher URL)
http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2024-05
Published Online Date: 2024-04-03
Accepted Date: 2024-03-22
Authors: Bastamova, M.
Gordienko, V. (ORCID Profile 0000-0002-9141-828X)
Doran, N.J. (ORCID Profile 0000-0001-8309-8805)
Ellis, A.D. (ORCID Profile 0000-0002-0417-0547)

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