Generalized Maximum Likelihood for Cross-Polarization Modulation Effects Compensation

We investigate the mitigation of nonlinearities with advanced digital signal processing focusing in particular on cross-polarization effects. Based on a relaxation of an analytical model derived for cross-polarization effects, this paper proposes a novel compensation method called generalized maximu...

Full description

Saved in:
Bibliographic Details
Published in:Journal of lightwave technology 2015-04, Vol.33 (7), p.1300-1307
Main Authors: Layec, Patricia, Ghazisaeidi, Amirhossein, Charlet, Gabriel, Antona, Jean-Christophe, Bigo, Sebastien
Format: Article
Language:English
Subjects:
Coherent systems
Compensation
Computer simulation
Crosstalk
Focusing
information theory
Kerr effects
Mathematical models
Modulation
Multiplexing
Nonlinear optics
Nonlinearity
optical fiber communication
Optical fibers
Q-factor
Signal to noise ratio
Vectors
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We investigate the mitigation of nonlinearities with advanced digital signal processing focusing in particular on cross-polarization effects. Based on a relaxation of an analytical model derived for cross-polarization effects, this paper proposes a novel compensation method called generalized maximum likelihood. It performs a joint blind channel estimation and symbol detection, and it additionally accounts for the statistical prior distributions of the cross-polarization crosstalk coefficients. This avoids an overestimation of these crosstalk coefficients. A practical method for both fast computations and optimal performance is then presented, which allows nonlinear compensation for high-order modulations. Next, we present Monte-Carlo simulations showing that the proposed algorithm performs close to the theoretical limits. Large performance improvement can be obtained and this is particularly emphasized with higher order modulation such as a 16-ary quadrature amplitude modulation. Finally, using Nyquist pulse shaping and polarization-division multiplexed with a quadrature phase-shift keying modulation, the experiments are shown to be in accordance with the simulations and show up to 0.7 dB improvement in Q-factor for the worst-case samples.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2015.2390257