Variable optical attenuator

G - Physics – 02 – B

Patent

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Details

G02B 26/02 (2006.01) G02B 6/26 (2006.01)

Patent

CA 2230664

A variable, hybrid optical attenuator has a flexure member which consists of a bridge portion joining two prongs which are flexibly movable relative to the bridge portion. A mirror is mounted on the bridge portion. The prongs are each connected to an actuator which can expand or contract in response to a control signal applied thereto. The control signal may be heat, an electric field, a magnetic field or, preferably, a combination thereof. The attenuator is positioned opposite a pair of optical waveguides so that an input optical signal from an input waveguide is incident on the mirror and, uponreflection, is received by the second waveguide. Attenuation of the transmission is effected by controlled tilting of the mirror caused by appropriate control signals, single or in combination, applied to one or both of the actuators.

Atténuateur optique hybride et variable composé d'un élément de flexion qui consiste en une jonction reliant deux branches qui se déplacent par rapport à la partie de jonction sur laquelle est monté un miroir. Chaque branche est raccordée à un actionneur qui peut se dilater ou se contracter en réponse à l'application d'un signal de commande. Le signal de commande peut être de la chaleur, un champ électrique, un champ magnétique ou, de préférence, leur combinaison. L'atténuateur est placé à l'opposé de deux guides d'ondes optiques de façon qu'un signal optique d'entrée d'un guide d'ondes d'entrée soit incident sur le miroir et, sur réflexion, soit reçu par le deuxième guide d'ondes. L'atténuation de la transmission est effectuée par une inclinaison contrôlée du miroir causée par des signaux de commande appropriés, simple ou en combinaison, appliqués sur l'un ou sur les deux actionneurs.

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