Title :
Performance Evaluation of Phase Estimation Algorithms in Equalized Coherent Optical Systems
Author :
Pessoa, L.M. ; Salgado, H.M. ; Darwazeh, I.
Author_Institution :
Inst. de Eng. de Sist. e Comput. do Porto (INESC Porto), Univ. do Porto, Porto, Portugal
Abstract :
We assess the performance of a coherent optical system employing a phase estimation algorithm combined with a least mean square decision-directed equalizer in a feedback configuration and compare it to the constant modulus algorithm with an independent carrier phase estimation approach for 16-quadratic-amplitude-modulation transmission. Both series and parallel implementations are discussed. Hardware issues regarding a recursive implementation of the estimation filter are also reported.
Keywords :
equalisers; least mean squares methods; optical communication equipment; optical feedback; phase estimation; quadrature amplitude modulation; recursive filters; equalized coherent optical system; estimation filter; feedback configuration; independent carrier phase estimation approach; least mean square decision-directed equalizer; optical communication; phase estimation algorithm; quadratic-amplitude-modulation transmission; Coherent systems; Kalman filtering; Wiener filtering; feedforward phase estimation; parallel algorithms;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2009.2024003
