Sequential Number-Theoretic Optimization for High-Dimensional Channel Equalization in Coherent Optical PDM Systems

Polarization-division multiplexing (PDM) in coherent optical communications enhances system capacity but is vulnerable to various channel distortions including transmitter and receiver in-phase/quadrature (IQ) mismatch, rotation of state of polarization (RSOP), frequency offset (FO) and phase noise...

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Bibliographic Details
Published in:IEEE signal processing letters Vol. 32; pp. 2329 - 2333
Main Authors: Liu, Shuai, Xu, Yangfan, Du, Xinwei
Format: Journal Article
Language:English
Published: New York IEEE 2025
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Bit error rate
Effectiveness
Equalization
Estimation
frequency offset
IQ mismatch
Multiplexing
Optical distortion
Optical polarization
Optical receivers
Optical transmitters
Optimization
Phase noise
Polarization
Quadratures
rotation of state of polarization (RSOP)
Sequential number-theoretic optimization (SNTO)
Signal detection
Signal processing algorithms
Signal to noise ratio
Symbols
Vectors
ISSN:1070-9908, 1558-2361
Online Access:Get full text
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Summary:Polarization-division multiplexing (PDM) in coherent optical communications enhances system capacity but is vulnerable to various channel distortions including transmitter and receiver in-phase/quadrature (IQ) mismatch, rotation of state of polarization (RSOP), frequency offset (FO) and phase noise (PN), which significantly degrade the system performance. To address these challenges, we propose a novel approach using sequential number-theoretic optimization (SNTO) for the joint estimation of these distortions. We further introduce a decision-aided scheme with a window-split structure to accurately track and compensate for time-varying RSOP and PN, thereby implementing signal detection. Through comprehensive mean squared error (MSE) and bit error rate (BER) analysis under different signal-to-noise ratio (SNR) conditions and varying RSOP speeds, our method demonstrates high precision and effectiveness. The SNTO-based algorithm maintains robust performance with superior estimation accuracy and resilience against ultra-fast RSOP. This work introduces an innovative solution for high-dimensional channel equalization in coherent optical PDM systems with not only effectiveness but also robustness.
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ISSN:1070-9908
1558-2361
DOI:10.1109/LSP.2025.3575611