Title :
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
fDate :
8/1/1991 12:00:00 AM
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;
Journal_Title :
Optoelectronics, IEE Proceedings J
