160-channel FM-video transmission using optical FM/FDM and subcarrier multiplexing and an erbium doped optical fibre amplifier

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Abstract
A total of 16 DFB lasers with 10 GHz frequency spacing were combined to transport 160-channel FM television signals to 16 locations; each link distance was 9 km with an average power margin of 7.5 dB. The 16 optical carriers were simultaneously modulated by a composite of 10 FM-video signals. A high-finesse optical Fabry–Perot etalon with a half-intensity width of about 1.5 GHz and a free spectral range of 4 nm was used, both as an optical channel filter and as a frequency discriminator. An erbium doped fibre amplifier was used to provide a net gain of 9.2 dB.