UCL logo

UCL Discovery

UCL home » Library Services » Electronic resources » UCL Discovery

Blind Equalization and Carrier Phase Recovery in a 16-QAM Optical Coherent System

Fatadin, I; Ives, D; Savory, SJ; (2009) Blind Equalization and Carrier Phase Recovery in a 16-QAM Optical Coherent System. J LIGHTWAVE TECHNOL , 27 (15) 3042 - 3049. 10.1109/JLT.2009.2021961.

Full text not available from this repository.

Abstract

Blind equalization and carrier phase recovery in a simulated 14 Gbaud 16-QAM optical coherent system are investigated. Equalization techniques to compensate for linear transmission impairments are presented using the constant modulus algorithm (CMA), the recursive least-squares (RLS)-CMA, and the radius directed equalization (RDE). With 7 T/2-spaced taps, the RDE and the RLS-CMA can compensate up to 1000 ps/nm of CD in the 16-QAM coherent system with performances comparable to the decision- directed (DD) equalizer. We show that the RDE is a promising technique for blind equalization in a 16-QAM coherent system with lower complexity than the RLS-CMA. Blind carrier phase recovery is investigated in a decision- directed-mode. We show that the blind carrier phase recovery algorithm can recover the Square-16-QAM constellation for laser beat linewidths of Delta nu T-s similar to 10(-4) in a polarization-multiplexed (POLMUX) 16-QAM coherent system with the RDE algorithm giving better overall performance than the CMA when compensating for CD and differential group delay (DGD). Finally, the dynamical characteristics of the equalizers to track endless polarization rotations are discussed. With the adaptation parameters optimized, the equalizers can track angular rate of rotation similar to 10(5) rad/s.

Type:Article
Title:Blind Equalization and Carrier Phase Recovery in a 16-QAM Optical Coherent System
DOI:10.1109/JLT.2009.2021961
Keywords:Blind equalization, carrier phase recovery, coherent communications, QAM, ALGORITHM
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Electronic and Electrical Engineering

Archive Staff Only: edit this record