Title :
Phase-Offset Estimation for Joint-Polarization Phase-Recovery in DP-16-QAM Systems
Author :
Müller, Rafael Rios ; De Arruda Mello, D.A.
Author_Institution :
Dept. of Electr. Eng., Univ. of Brasilia, Brasília, Brazil
Abstract :
We propose a method that estimates the phase-offset between polarization-demultiplexed 16-ary quadrature amplitude modulation (16-QAM) signals, enabling the utilization of joint-polarization phase-recovery (JPPR) algorithms. The method is based on a Viterbi & Viterbi-like architecture that raises selected samples to the fourth power to remove the data dependence from the phase estimation process. Monte Carlo simulations indicate that feedforward and decision-directed JPPR algorithms using the proposed phase-offset estimation technique effectively relax the laser linewidth requirements for dual-polarization 16-QAM systems.
Keywords :
Monte Carlo methods; demultiplexing; optical fibre communication; optical modulation; phase estimation; quadrature amplitude modulation; 16-QAM; 16-ary quadrature amplitude modulation; DP-16-QAM systems; Monte Carlo simulations; Viterbi & Viterbi-like architecture; decision-directed JPPR algorithm; feedforward algorithm; joint-polarization phase-recovery; phase-offset estimation; polarization demultiplexing; Estimation; Feedforward neural networks; Laser noise; Local oscillators; Optical modulation; Optical noise; Optical polarization; Optical receivers; Optical transmitters; Phase detection; Phase estimation; Phase noise; Signal generators; Signal to noise ratio; Optical modulation; optical receivers; quadrature amplitude modulation;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2010.2066264
