Title :
A Performance Investigation of Adaptive Phase Estimations in Coherent Optical Communications
Author :
Zhang, Shaoliang ; Xu, Lei ; Kam, Pooi Yuen ; Yu, Changyuan ; Chen, Jian ; Wang, Ting
Author_Institution :
Dept. of Electr. & Comput. Eng., Nat. Univ. of Singapore, Singapore, Singapore
fDate :
4/15/2011 12:00:00 AM
Abstract :
We carried out a comprehensive analysis to examine the phase error variances in three adaptive phase estimation (PE) methods: the adaptive decision-aided PE, the Kalman PE, and the normalized least-mean square PE algorithms. The results show that they share the same phase error variances but with different approaches to determine the stepsize. Their performances in different quadrature amplitude modulation formats are analytically investigated for the purpose of determining the laser linewidth tolerance.
Keywords :
Kalman filters; adaptive estimation; least mean squares methods; optical communication; optical modulation; optical receivers; phase estimation; quadrature amplitude modulation; Kalman phase estimation; adaptive decision-aided phase estimation; coherent optical communications; laser linewidth tolerance; normalized least-mean square phase estimation; optical receivers; phase error variances; quadrature amplitude modulation; Adaptive receiver; coherent detection; laser phase noise; phase estimation (PE); quadrature amplitude modulation (QAM);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2011.2109058
