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24 November 2023 Improved IQ imbalance compensation algorithm in faster-than-Nyquist coherent optical communication systems
Tao Yang, Jing Zhao, Fengyu Cao, Gaizun Xia, Naixin Yao, Liman Liu
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Proceedings Volume 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023); 1293533 (2023) https://doi.org/10.1117/12.3007726
Event: Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 2023, Xi’an, China
Abstract
In order to solve the problem that the severe inter-symbol interference (ISI) introduced by faster-than-Nyquist (FTN) strong filtering leads to the degradation of the equalization capability of the traditional receiver side (Rx) IQ imbalance compensation, a two-stage Rx IQ imbalance compensation algorithm is designed and demonstrated in this paper. The algorithm uses a time domain equalizer based on the decision directed-least mean square (DD-LMS) algorithm cascaded with a 4×2 frequency domain (FD) equalizer based on the radius directed equalization (RDE) algorithm, which can effectively improve the compensation range compared to using only a conventional 4×2 FD equalizer based on the RDE algorithm. 128Gbaud-FTN-PM-16QAM system simulation results show that with an acceleration factor as low as 0.85, the designed algorithm has a 14.3%, 100% and 40% improvement in the compensation range of Rx IQ amplitude, phase and skew imbalance compared to using only the 4×2 FD equalizer based on the RDE algorithm. The results validate the performance improvement of the proposed algorithm.
(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Tao Yang, Jing Zhao, Fengyu Cao, Gaizun Xia, Naixin Yao, and Liman Liu "Improved IQ imbalance compensation algorithm in faster-than-Nyquist coherent optical communication systems", Proc. SPIE 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 1293533 (24 November 2023); https://doi.org/10.1117/12.3007726
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KEYWORDS
Receivers
Optical transmission
Digital signal processing
Optical coherence
Tunable filters
Polarization
Telecommunications
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