An Optical Link For CATV (1971)

By R. T. Daly and M. G. Cohen

This paper studies the technical feasibility of using a free space cascade of optical (laser) links for CATV service. By employing available Weather Bureau visibility statistics for New York City, the effects of optical path attenuation on link reliability are determined. Based upon these results, a link is proposed which will provide 99.9% reliability with a 42 db signal-to-noise ratio for transmission of 25 TV channels plus the FM band. Repeater spacings, required optical powers, detailed configurations, modulation techniques and costs are discussed.

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