Optical receiver and demultiplexer for free-space wavelength...

H - Electricity – 04 – B

Patent

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H04B 10/10 (2006.01) H04J 14/02 (2006.01)

Patent

CA 2229360

A free-space wavelength division multiplexing system is provided having a demultiplexer and receiver arrangement. The demultiplexer and receiver arrangement may be based on a rotatable interference filter. A desired wavelength can be selected by adjusting the angle of the interference filter with respect to the incoming light beam. Alternatively, the demultiplexer and receiver arrangement may be based on a diffraction grating. Multiple wavelengths of light are diffracted at different angles, which spatially separates each wavelength in the system. A corresponding multiple-element linearphotodetector array is used to receive the spatially separated optical signals.

L'invention est un système de multiplexage optique pour l'espace libre qui utilise un ensemble multiplexeur-récepteur. Cet ensemble peut comporter un filtre antiparasite tournant. On peut obtenir la longueur d'onde désirée en ajustant l'angle du filtre par rapport à la direction du faisceau incident. Dans une autre concrétisation de l'inventions, l'ensemble démultiplexeur-récepteur peut comporter un réseau de diffraction. Les ondes lumineuses de longueurs d'onde différentes sont diffractées à des angles différents, ce qui sépare spatialement les diverses longueurs d'ondes présentes dans le système. Un réseau multiélément de photodétecteurs linéaires correspondant est utilisé pour recevoir les signaux lumineux séparés spatialement.

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