Gerhard Musil

A Flexible, Modular Power-Feeding System for Digital Optical Waveguide Transmission

A power-feeding system developed for digital signal-transmission systems on optical fibers is presented. It consists of 1 to 3 power-feeding units (400 mA, 700 V each), a power-feeding control unit, the power-feeding cable and the remotely-fed converters to supply the loads. The power-feeding control unit performs a route test before the power-feeding is switched on, locates route faults and monitors the entire power-feeding system during operation. The converters, series-connected in the power-feeding circuit, each have two mutually isolated outputs rated 60 V/25 W. The outputs of one or more converters can be connected in parallel. The reach of the system is determined, apart from the maximum available power-feeding voltage, only by the resistance of the cable used and the power-requirement of the equipment to be fed. Several hundred kilometers can be spanned. The modular structure of the power-feeding system allows to fulfi11 various requirements in regard to system architecture, power, redundancy and economic efforts. As well as fiber-optic systems, other loads in the power range of approximately 10 to 200 W can be supplied.