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Proceedings Paper

Coherent Fiber Optic Subcarrier Multiplexed Systems
Author(s): Richard Gross; Paul Hill; Robert Olshansky
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Paper Abstract

The results for coherent fiber optic digital subcarrier multiplexed (SCM) system experiments are described. With a frequency shift keying (FSK) format, 20 video channels at 100 Mb/s each were transmitted on one optical carrier using microwave subcarriers in a multi-octave configuration. A receiver sensitivity of -27 dBm was obtained when using narrow linewidth Nd YAG lasers, representing a 14 dB improvement over a 20 channel direct detection SCM system. It is shown that intermodulation distortion, in addition to shot noise and thermal noise, limits the obtainable receiver sensitivity. Theoretical and experimental results are compared and conditions for optimal performance as a function of channel number and phase modulation index are given. Analog system experiments using standard DFB lasers with a combined linewidth of 50 MHz were also performed. By employing a simple phase noise cancellation circuit, 12 FM video channels with a 30 MHz bandwidth and a 40 MHz channel spacing were successfully transmitted.

Paper Details

Date Published: 5 February 1990
PDF: 9 pages
Proc. SPIE 1175, Coherent Lightwave Communications: Fourth in a Series, (5 February 1990); doi: 10.1117/12.963276
Show Author Affiliations
Richard Gross, GTE Laboratories Incorporated (United States)
Paul Hill, GTE Laboratories Incorporated (United States)
Robert Olshansky, GTE Laboratories Incorporated (United States)

Published in SPIE Proceedings Vol. 1175:
Coherent Lightwave Communications: Fourth in a Series
Roger C. Steele; Harish R. Sunak, Editor(s)

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