Reconfigurable laser communications terminal

H - Electricity – 04 – B

Patent

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Details

H04B 10/105 (2006.01)

Patent

CA 2353640

A system and method for free space optical communication include at least one reconfigurable terminal (30) using dual-wavelength operation for isolation between transmitted and received signals in combination with polarization switching to separate and steer the transmitted and received signals to and from corresponding transmitters (40) and receivers (48). The polarization based switching provides wavelength independent beam steering to facilitate interchanging of wavelengths for transmitted and received signals. A controllable or passive polarization changer (56) such as a wave plate or polarization rotator allows the communication terminal (30) to be reconfigured without also requiring the repositioning and associated precision alignment of beam steering optics (54, 62, 66).

La présente invention concerne un système et un procédé de communications optique dans l'espace. A cet effet, on utilise au moins un terminal configurable fonctionnant en longueurs d'ondes doubles de façon à conserver l'isolation entre les signaux d'émission et les signaux de réception, en relation avec des procédés de commutation de polarisation servant à séparer et d'aiguiller les signaux d'émission et les signaux de réception échangés avec les émetteurs (40) et récepteurs (48) correspondants. La commutation à base de polarisation permet un aiguillage des faisceaux indépendamment de la longueur d'ondes, ce qui vient faciliter l'échange de longueurs d'onde entre signaux en émission et signaux en réception. Un convertisseur de polarisation (56) passif ou commandé tel qu'un guide d'ondes plat ou un rotateur de polarisation permet de reconfigurer le terminal de communications (30) sans qu'il y ait besoin de repositionnement ni de calage de précision associé de l'optique d'aiguillage du faisceau (54, 62, 66).

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