Impact of Sinusoidal Tones on Parallel Decision-Directed Phase Recovery for 64-QAM

Author

Wing-Chau Ng ; Nguyen, An T. ; Ayotte, S. ; Chul-Soo Park ; Rusch, Leslie A.

Author_Institution

Electr. & Comput. Eng. Dept., Univ. Laval, Quebec City, QC, Canada

Volume

26

Issue

5

fYear

2014

fDate

1-Mar-14

Firstpage

486

Lastpage

489

Abstract

Coherent optical communications at Gbaud rates require parallelization in digital signal processing, however the feedback delay introduced by pipelining challenges phase recovery. Parallelized phase recovery creates a greater sensitivity to residual frequency offset induced by the presence of sinusoidal tones in the source. We experimentally investigate the impact of sinusoidal laser phase noise on parallel decision-directed phase recovery in a 5 Gb 64-quadrature amplitude modulation system, including the effects of frequency offset compensation and equalization.

Keywords

laser noise; optical communication; quadrature amplitude modulation; 64-QAM; 64-quadrature amplitude modulation system; coherent optical communications; digital signal processing; feedback delay; frequency offset compensation; parallel decision-directed phase recovery; residual frequency offset; sinusoidal laser phase noise; sinusoidal tones; Delays; Frequency modulation; Laser noise; Optical noise; Optical receivers; Quadrature amplitude modulation; Signal to noise ratio; 64-QAM; coherent detection; phase recovery;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2013.2297708

Filename

6701345