Electro-holographic optical switch

G - Physics – 02 – B

Patent

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Details

G02B 5/32 (2006.01) G02F 1/03 (2006.01) G02F 1/21 (2006.01) G02F 1/31 (2006.01) G03H 1/04 (2006.01) H04B 10/20 (2006.01)

Patent

CA 2336588

The invention relates to an optical switch which includes a paraelectric photorefractive material (10), storing a hologram (24), possibly a latent hologram, whose reconstruction, or activation and reconstruction, is controllable by means of an applied electric field (12, 14). The hologram may be formed by spatial modulation of refractive index of the paraelectric photorefractive material, which arises from the quadratic electro-optic effect induced by the combined action of a spatially modulated space charge within the paraelectric photorefractive material and an external applied electric field. The switch may be used in a switching network, such as a multistage network for optical communication.

La présente invention porte sur un commutateur optique comprenant un matériau (10) photoréfractif paraélectrique, renfermant un hologramme (24), éventuellement un hologramme latent dont la reconstruction, ou l'activation et la reconstruction, peut (ou peuvent) être régulée(s) par l'application d'un champ électrique (12, 14). L'hologramme peut être formé par modulation spatiale de l'indice de réfraction du matériau photoréfractif paraélectrique provenant de l'effet électro-optique quadratique induit par l'action combinée d'une charge modulée spatialement dans le matériau photoréfractif paraélectrique et l'application d'un champ électrique externe. Le commutateur peut être utilisé dans un réseau de commutation tel qu'un réseau multi-étage pour communication optique.

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