Coherent Fiber Optic Subcarrier Multiplexed Systems

Richard Gross; Paul Hill; Robert Olshansky

doi:10.1117/12.963276

5 February 1990 Coherent Fiber Optic Subcarrier Multiplexed Systems

Richard Gross, Paul Hill, Robert Olshansky

Proceedings Volume 1175, Coherent Lightwave Communications: Fourth in a Series; (1990) https://doi.org/10.1117/12.963276
Event: OE/FIBERS '89, 1989, Boston, United States

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.

Citation Download Citation

Richard Gross, Paul Hill, and Robert Olshansky "Coherent Fiber Optic Subcarrier Multiplexed Systems", Proc. SPIE 1175, Coherent Lightwave Communications: Fourth in a Series, (5 February 1990); https://doi.org/10.1117/12.963276

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