Blind Joint Polarization Demultiplexing and IQ Imbalance Compensation for M -QAM Coherent Optical Communications

Marwa Kazdoghli Lagha (1) , Robin Gerzaguet (1) , Laurent Bramerie (2) , Mathilde Gay (2) , Marie-Laure Chares (2) , Christophe Peucheret (2) , Pascal Scalart (1)

1 GRANIT - Adaptive algorithms and architectures for energy-efficient wireless systems
2 FOTON - Institut des Fonctions Optiques pour les Technologies de l'informatiON

A novel joint polarization demultiplexing and IQ imbalance compensation scheme for coherent optical communications that uses global update is proposed and analyzed through numerical simulations. We describe the system model and derive its related equations. Next, we formulate our blind M-QAM arbitrary approach based on EASI algorithm and using the second order statistics of the observed signals. A comparison of the proposed joint method with the traditional CMA for polarization demultiplexing followed by BASS for IQ imbalance compensation is also reported. Evaluated metrics (EVM, MSE, BER) demonstrate its effectiveness compared with CMA cascaded with BASS algorithm.

Mots clés: Polarization demultiplexing; IQ imbalance compensation; Joint algorithm; CMA; MSE; EVM; BER; Optical communications

Domaines: Optique / photonique; Traitement du signal et de l'image [eess.SP]

Marwa Kazdoghli Lagha, Robin Gerzaguet, Laurent Bramerie, Mathilde Gay, Marie-Laure Chares, et al.. Blind Joint Polarization Demultiplexing and IQ Imbalance Compensation for M -QAM Coherent Optical Communications. Journal of Lightwave Technology, 2020, 38 (16), pp.4213-4220. ⟨10.1109/JLT.2020.2986601⟩. ⟨hal-02916203⟩