Observation of coherent Rayleigh noise in single-source bidirectional optical fiber systems
1988; Institute of Electrical and Electronics Engineers; Volume: 6; Issue: 2 Linguagem: Inglês
10.1109/50.4009
ISSN1558-2213
AutoresThomas H. Wood, R. A. Linke, B.L. Kasper, Elizabeth C. Carr,
Tópico(s)Photonic and Optical Devices
ResumoThe authors report noise in a directional optical fiber system that they believe arises from the interference of the signal light with the Rayleigh backscattered light. This noise, called coherent Rayleigh noise (CRN), is the dominant noise source in this system. The interference provides a mechanism for translation of laser phase fluctuations into receiver photocurrent fluctuations. A number of noise reduction schemes are proposed. The authors demonstrate that CRN can be reduced, but not eliminated, by providing a small drive current modulation signal to the source laser to broaden its linewidth. Systems using this single-source-bidirectional architecture must take this noise source into account. >
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