Prevention of lasing in a closed optical loop

Details Prevention of lasing in a closed optical loop Prevention of lasing in a closed optical loop

H - Electricity

04

B

H04B 10/08 (2006.01) H04J 3/08 (2006.01) H04J 14/02 (2006.01) H04L 12/437 (2006.01)

Patent

CA 2387615

A wavelength division multiplexed (WDM) optical communication system which includes a detection device for preventing lasing in a physically closed optical loop. The detection device is included on each pass-through interface of each node in the WDM system. Each pass-through interface is assigned to a channel for a subset of the facility signal. The detection device includes a normally open switch is closed only when a real optical signal of the subset of the facility signal is detected, with the subset of the facility signal then being passed by the closed switch. Accordingly, when the switch is open, noise is blocked from initiating a lasing condition in a physically closed optical loop which disrupts customer service on the other channels.

La présente invention concerne un système de communications optiques à multiplexage en longueur d'ondes (WDM) comprenant un dispositif de détection destiné à empêcher un pompage optique dans une boucle optique physiquement fermée. Le dispositif de détection est mis en place à chaque interface de traversée de chaque noeud dans le système WDM. Chaque interface de traversée est assignée à un canal pour un sous-ensemble de signal d'installation. Le dispositif de détection comprend un commutateur normalement ouvert qui est fermé seulement lors de la détection d'un signal optique réel du sous-ensemble de signal d'installation, le sous-ensemble du signal d'installation étant alors passé par le commutateur fermé. Ainsi, lorsque le commutateur est ouvert, le bruit ne peut initier une condition de pompage optique dans une boucle physiquement fermée qui conduirait à l'interruption du service client sur les autres canaux.

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