Effects of local oscillator excess noise, laser phase noise and time jitter on digital signalling schemes in coherent optical fibre communication systems

Author

Singh, N. ; Jain, V.K. ; Gupta, H.M.

Author_Institution

Dept. of Electron. & Commun., Allahabad, India

Volume

137

Issue

2

fYear

1990

fDate

4/1/1990 12:00:00 AM

Firstpage

115

Lastpage

123

Abstract

Investigates performance of heterodyne detection type coherent optical-fibre communication systems for binary and M-ary PSK, FSK and ASK digital signalling schemes, considering shot noise, local oscillator (LO) excess noise, laser phase noise and time jitter. Expressions for probability of error when LO excess noise, laser phase noise and time jitter are present as well as shot noise, are derived. Power penalties are also obtained in each case. Finally, the three signalling schemes are compared. The binary PSK is found to be the most efficient among the three signalling schemes. However, when laser phase noise is large, M-FSK and M-ASK signalling schemes give better performance than the M-PSK signalling scheme. The M-FSK scheme is found to require a larger bandwidth, and the M-ASK scheme is less immune to time jitter

Keywords

amplitude modulation; digital communication systems; digital signals; electron device noise; frequency shift keying; light coherence; optical communication equipment; optical fibres; optical links; phase shift keying; signal detection; signalling (telecommunication networks); ASK digital signalling schemes; FSK; bandwidth; binary PSK; heterodyne detection type coherent optical-fibre communication systems; laser phase noise; local oscillator excess noise; power penalties; probability of error; shot noise; time jitter;

fLanguage

English

Journal_Title

Optoelectronics, IEE Proceedings J

Publisher

iet

ISSN

0267-3932

Type

jour

Filename

50645