Joint-Polarization Phase-Noise Estimation and Symbol Detection for Optical Coherent Receivers
Artikel i vetenskaplig tidskrift, 2016

The problem of optimal symbol detection in the presence of laser phase noise is studied, for uncoded polarization-multiplexed fiber-optic transmission. To this end, the maximum a posteriori (MAP) symbol detector is presented. Specifically, it is emphasized that obtaining phase-noise point estimates, and treating them as the true values of the phase noise, is in general suboptimal. Furthermore, a pilot-based algorithm that approximates the MAP symbol detector is developed, using approaches adopted from the wireless literature. The algorithm performs joint-polarization phase-noise estimation and symbol detection, for arbitrary modulation formats. Through Monte Carlo simulations, the algorithm is compared to existing solutions from the optical communications literature. It is demonstrated that joint-polarization processing can significantly improve upon the single-polarization case, with respect to linewidth tolerance. Finally, it is shown that with less than 3% pilot overhead, the algorithm can be used with lasers having up to 6 times larger linewidths than the most well-performing blind algorithms can tolerate.

Coherent detection

digital signal processing

phase noise

optical fiber communication


Arni Alfredsson

Signaler och system, Kommunikationssystem, informationsteori och antenner, Kommunikationssystem

Erik Agrell

Signaler och system, Kommunikationssystem, informationsteori och antenner, Kommunikationssystem

Journal of Lightwave Technology

0733-8724 (ISSN)

Vol. 34 4394-4405


Informations- och kommunikationsteknik