Device for triggering an alarm system in the event of insufficie

Details Device for triggering an alarm system in the event of insufficie Device for triggering an alarm system in the event of insufficie

1981-02-09

1983-08-16

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455613, 455619, 340556, H04B 900

Patent

active

043995659

ABSTRACT:
An alarm-triggering device for the receiver of an optical-fiber transmission system including in series a filter which has a passband located externally with respect to the band of frequencies employed for optical-fiber transmission and the input of which is connected to an avalanche photodiode, an amplifier, a rectifier, a voltage comparator circuit, and alarm-triggering circuit.

REFERENCES:
patent: 4249264 (1981-02-01), Crochet et al.

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