Experimental demonstration of modified constant modulus algorithm with polarization demultiplexing in Stokes space in optical coherent receiver

Constant modulus algorithm (CMA) is widely applied for polarization demultiplexing in coherent optical communication system. However, the singular value problem always plagues CMA. Modified CMA based on polarization demultiplexing in Stokes space (SS-PDM) was proposed to avoid the singular value pro...

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Bibliographic Details
Published in:Optics communications Vol. 583; p. 131763
Main Authors: Huang, Bohang, Dong, Xiangyong, Shi, Fengjie, Yu, Zhenming, Xu, Kun
Format: Journal Article
Language:English
Published: Elsevier B.V 01.06.2025
Subjects:
Coherent detection
Constant modulus algorithm
Polarization demultiplexing
Polarization-dependent loss
Stokes space
Stokes space
Polarization demultiplexing
Coherent detection
Polarization-dependent loss
Constant modulus algorithm
ISSN:0030-4018
Online Access:Get full text
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Summary:Constant modulus algorithm (CMA) is widely applied for polarization demultiplexing in coherent optical communication system. However, the singular value problem always plagues CMA. Modified CMA based on polarization demultiplexing in Stokes space (SS-PDM) was proposed to avoid the singular value problem in simulation. Here we firstly experimentally demonstrate the modified CMA based on SS-PDM in optical coherent receivers. We conduct experiment of 40-Gbit/s polarization multiplexing (PDM) QPSK to verify this method. The experimental results show that the singularity problem of CMA disappears for Polarization-dependent loss (PDL) of 2.7 dB and 4.8 dB by using the modified CMA and the convergence speed of the modified CMA increases significantly compared with that of conventional CMA.
ISSN:0030-4018
DOI:10.1016/j.optcom.2025.131763