Safety device for optical fibre data transmission system - has radiation generator controlled by signal transmitted against main radiation direction

摘要

The safety device for a data transmission system uses as control signal a part of the signal of the radiation generator (13). The control signal is tuned out of the radiation generator signal by means of a mirror arrangement. Where there are several optical fibre lines, at least one control signal is generated and fed back. For each junction point between two optical fibre lines one control signal can be derived from the fibre line. The control signal used may also be an electrical signal from the radiation receiver (12). The input circuit includes a modulation unit (15) a radiation generator (13), a switch unit (16) and a control signal receiver (20).