H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 10/12 (2006.01) H01S 3/02 (2006.01) H04B 10/08 (2006.01) H04B 10/17 (2006.01)
Patent
CA 2062665
In an optical-fibre telecommunications line comprising two terminal stations, each having an optical-signal transmitter and a receiver operationally connected by an automatic protection device suitable for shutting down said transmitter in the absence of a received optical signal, and respective optical-fibre lines connecting the transmitter of one station to the receiver of the other station and including at least one optical amplifier, at least one of said optical amplifiers is provided with a protection device comprising means for the detection of the presence of an optical signal at the output from the amplifier, operationally associated with means for interrupting the emission of light located downstream of the said detection means there are associatedsaid detection means, the interruption of the emission downstream determining the interruption of the emission along the entire line through the intervention of said automatic device for the protection of the terminal stations. With said detection means there are associated filtering means to limit the signal at the output from the amplifier to the alternating component of the same only, means for detecting the peak of said alternating component, and means for comparing the detected peak with a pre-set threshold, which operate said interruption means to interrupt the transmission of the signal at the output from the amplifier when said detection means detect a substantial absence of the signal at output.
Grasso Giorgio
Righetti Aldo
Tamburello Mario
Pirelli Cavi S.p.a.
Smart & Biggar
LandOfFree
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