DocumentCode
912906
Title
Excess noise in heterodyne receivers
Author
Schiess, M. ; Johansson, B.S.
Author_Institution
Dept. of Electron., Photonics & Microwave Eng., R. Inst. of Technol., Stockholm, Sweden
Volume
140
Issue
3
fYear
1993
fDate
6/1/1993 12:00:00 AM
Firstpage
217
Lastpage
220
Abstract
The influence of excess noise above the classical shot noise level in heterodyne receivers is investigated. It is shown how excess noise from the local oscillator (LO), beside thermal and phase noise, influences the system performance. Under carefully controlled experimental conditions, the LO power can be decoupled from excess noise. This yields an optimum LO power to get maximum receiver sensitivity. The optimum LO power is determined by the transition from shot noise dominance to excess noise dominance
Keywords
demodulation; noise; optical modulation; optical receivers; optimisation; sensitivity; classical shot noise level; excess noise; heterodyne receivers; local oscillator; maximum receiver sensitivity; optimum local oscillator power; phase noise; system performance; thermal noise;
fLanguage
English
Journal_Title
Optoelectronics, IEE Proceedings J
Publisher
iet
ISSN
0267-3932
Type
jour
Filename
219421
Link To Document