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Square wave frequency modulation in a coherent optical FSK TV-transmission/distribution system

: Li, J.; Bunning, H.; Schmidt, F.

Journal of optical communications 13 (1992), No.1, pp.30-2
ISSN: 0173-4911
Journal Article
Fraunhofer HHI ()
cable television; codecs; demodulation; frequency shift keying; light coherence; optical links; optical modulation; video signals; fsk; catv; square wave frequency modulated signal; coherent optical frequency shift keying-system; high sensitivity; coherent heterodyne system; swfm codecs; digital coherent optical multichannel tv-transmission/distribution system; sensitivity; video signal; noise ratio

The transmission of a square wave frequency modulated signal via a coherent optical frequency shift keying-system combines the advantages of the high sensitivity of the coherent heterodyne system with the simplicity of the SWFM codecs. This paper describes the implementation of SWFM codecs in a digital coherent optical multichannel TV-transmission/distribution system. The authors obtained a sensitivity of -51 dBm for a video signal to noise ratio of 56 dB (weighted).