Carrier recovery and filtering in optical BPSK heterodyne systems disturbed by phase noise from external cavity semiconductor lasers

Author

Pires, J.J.O. ; Da Rocha, J. R Ferreira

Author_Institution

Dept. of Electr. & Comput. Eng., Tech. Univ. of Lisbon, Portugal

Volume

138

Issue

4

fYear

1991

fDate

8/1/1991 12:00:00 AM

Firstpage

284

Lastpage

292

Abstract

The performance of an optical BPSK heterodyne system using external cavity semiconductor lasers and a squaring loop carrier synchroniser is theoretically analysed by means of an analytical method. The method is based on the Gram-Charlier series and includes the effect of filtering on the baseband signal disturbed by phase error due to imperfect carrier recovery and additive Gaussian noise. A detailed modelling of the phase error term is also performed, taking into account the influence of non-Lorentzian laser phase noise. Numerical results for a typical 565 Mb/s BPSK system are presented. It is found that the filter decreases the impact of laser phase noise, namely by reducing the degradation due to relaxation oscillations of the semiconductor lasers

Keywords

electron device noise; laser cavity resonators; optical communication equipment; optical links; phase shift keying; semiconductor junction lasers; 565 Mbit/s; Gram-Charlier series; additive Gaussian noise; analytical method; baseband signal; binary phase shift keying; carrier recovery; degradation; external cavity semiconductor lasers; filtering; nonLorentzian laser; optical BPSK heterodyne systems; phase error; phase error term; phase noise; relaxation oscillations; squaring loop carrier synchroniser;

fLanguage

English

Journal_Title

Optoelectronics, IEE Proceedings J

Publisher

iet

ISSN

0267-3932

Type

jour

Filename

84015