Title :
Costas loop analysis for coherent optical receivers
Author :
Hodgkinson, T.G.
Author_Institution :
British Telecom Research Laboratories, Ipswich, UK
Abstract :
The Costas loop is analysed taking both shot and laser phase noise sources into account and it is shown that to avoid large performance penalties beat linewidth to bit-rate ratios smaller than 0.05% and 0.5% are needed for PSK homodyne and heterodyne systems, respectively.
Keywords :
demodulation; optical communication equipment; phase shift keying; random noise; receivers; Costas loop; PSK; beat linewidth/bit-rate ratio; coherent optical receivers; heterodyne systems; laser phase noise sources; shot noise;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19860268
