Frequency-selective optical switch using polarization rotation

Details Frequency-selective optical switch using polarization rotation Frequency-selective optical switch using polarization rotation

G - Physics

02

F

G02F 1/13 (2006.01) G02B 6/34 (2006.01) G02F 1/1347 (2006.01) G02F 1/31 (2006.01) H04J 14/02 (2006.01) H04J 14/06 (2006.01) H04Q 11/00 (2006.01) G02F 1/141 (2006.01)

Patent

CA 2163630

A frequency-selective optical switch capable of switching separate optical signals in a physical input channel to a selected output channel. A diffraction grating (12) spatially divides the input channel (10) into its frequency components, which pass through different segments of a liquid-crystal modulator (24). The liquid-crystal modulator segments (20, 22) are separately controlled to rotate the polarization of the frequency channel passing therethrough or to leave it intact. The channels then pass through a polarization-dispersive element (28) which spatially separates the beams (14, 16) in the transverse direction according to their polarization. A second diffraction grating (40) recombines the frequency components of the same polarization into multiple output beams (42, 44).

L'invention concerne un commutateur optique à sélectivité de la fréquence capable de commuter des signaux optiques séparés dans un canal d'entrée physique vers un canal de sortie sélectionné. Un réseau de diffraction (12) divise de manière spatiale le canal d'entrée (10) en ses composantes de fréquence qui passent à travers des segments différents d'un modulateur à cristaux liquides (24). Les segments (20, 22) du modulateur à cristaux liquides sont commandés séparément pour effectuer la rotation de la polarisation du canal de fréquence passant par celui-ci ou pour le quitter intact. Les canaux passent ensuite à travers un élément à dispersivité de polarisation (28) qui sépare de manière spatiale les faisceaux (14, 16) dans la direction transversale par rapport à leur polarisation. Un second réseau de diffraction (40) recombine les composantes de fréquence de la même polarisation en faisceaux de sortie multiples (42, 44).

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