A 5.1 km Repeater Less Fiber Optic System For Multichannel Operations (1980)

By Robert C. Tenten, Manhattan Cable TV

The present state of the art in fiber optic cable loss is about 4 to 5 dB/km. Operational bandwidths of 300 MHz can be achieved over that distance when using fiber with bandwidths in the 900 MHz to 1 GHz/km range.

In order to provide high quality multichannel signal transmission over extended distances, it is advisable to use FM transmission to overcome the intermodulation products of presently available laser transmitters and improve signal-ton-oise performance.

This paper describes a practical 5.1 km fiber optic system using no repeaters. Wide deviation FM video transmission is used to obtain a signal-to-noise ratio of over 52 dB per channel. Up to eight channels can be carried on each fiber.

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