Attention-aided partial bidirectional RNN-based nonlinear equalizer in coherent optical systems

Abstract

We leverage the attention mechanism to investigate and comprehend the contribution of each input symbol of the input sequence and their hidden representations for predicting the received symbol in the bidirectional recurrent neural network (BRNN)-based nonlinear equalizer. In this paper, we propose an attention-aided novel design of a partial BRNN-based nonlinear equalizer, and evaluate with both LSTM and GRU units in a single-channel DP-64QAM 30Gbaud coherent optical communication systems of 20 × 50 km standard single-mode fiber (SSMF) spans. Our approach maintains the Q-factor performance of the baseline equalizer with a significant complexity reduction of ∼56.16% in the number of real multiplications required to equalize per symbol (RMpS). In comparison of the performance under similar complexity, our approach outperforms the baseline by ∼0.2dB to ∼0.25dB at the optimal transmit power, and ∼0.3dB to ∼0.45dB towards the more nonlinear region.

Publication DOI: https://doi.org/10.1364/oe.464159
Divisions: College of Engineering & Physical Sciences > Aston Institute of Photonics Technology (AIPT)
College of Engineering & Physical Sciences
Additional Information: Published by Optica Publishing Group under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funding Information: H2020 Marie Skłodowska-Curie Actions (813144); Leverhulme Trust (RP-2018-063); Engineering and Physical Sciences Research Council (EP/N509796/1, EP/R513374/1).
Uncontrolled Keywords: Atomic and Molecular Physics, and Optics
Publication ISSN: 1094-4087
Last Modified: 22 May 2024 07:56
Date Deposited: 15 Sep 2022 15:13
Full Text Link:
Related URLs: https://opg.opt ... 32908&id=495566 (Publisher URL)
http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2022-08-29
Published Online Date: 2022-08-24
Accepted Date: 2022-07-19
Authors: Liu, Yifan
Sanchez, Victor
Freire, Pedro J.
Prilepsky, Jaroslaw E. (ORCID Profile 0000-0002-3035-4112)
Koshkouei, Mahyar J.
Higgins, Matthew D.

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