Optical communications link fault signalling

H - Electricity – 04 – B

Patent

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H04B 10/08 (2006.01) H04B 10/17 (2006.01)

Patent

CA 2081021

A fault signalling system for an optical fibre-based communications link having erbium doped fibre amplifier repeaters (20) comprises a broadband optical source (34) for generating a fault signal in the event of a fault occurring. Each repeater includes such a broadband source, which will output a characteristic fault signal onto the link for transmission to a receiving station, in the event of a fault being detected at that repeater. Advantageously, a control circuit which enables the source (34) to emit its fault signal when appropriate is also used as part of an automatic gain control for the output of the amplifier repeater in normal operation.

Système de signalisation de dérangement pour liaison de transmission à fibres optiques ayant des répéteurs amplificateurs à fibre dopée à l'erbium (20). Comprend une source optique à large bande (34) pour produire un signal de dérangement en cas de dérangement. Chaque répéteur comprend une source à large bande, qui produit un signal de dérangement caractéristique sur la liaison pour transmission à une station réceptrice, lorsqu'un dérangement est détecté au répéteur. Chose avantageuse, un circuit de commande permettant à la source (34) d'émettre son signal de dérangement au besoin est également utilisé comme élément d'une commande automatique de gain pour la sortie du répéteur amplificateur en fonctionnement normal.

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