Tunable optical fiber bragg and long period grating

Details Tunable optical fiber bragg and long period grating Tunable optical fiber bragg and long period grating

G - Physics

02

B

G02B 6/34 (2006.01) G02F 1/01 (2006.01) G02F 1/365 (2006.01)

Patent

CA 2318905

Disclosed is a tunable optical filter which may be used in telecommunications systems. The filter comprises a single mode optical waveguide containing a grating. The resonance wavelength of the filter is changed by changing the boundary condition at the interface between the cladding layer (14) and an additional layer (16) applied to the outer cladding layer surface. This boundary condition is changed by changing the refractive index of the additional layer (16). Means for changing the refractive index of the additional layer (16) include establishing a structural resonance in the additional layer, or forming the additional layer from electro-optic or piezoelectric materials.

L'invention concerne un filtre optique syntonisable pouvant être utilisé dans des systèmes de télécommunications. Le filtre comprend un guide d'ondes optique en mode unique, contenant un réseau de diffraction. La longueur d'onde de résonance du filtre est modifiée par changement de la condition de limite, au niveau de l'interface entre la couche de métallisation (14) et une couche supplémentaire (16) appliquée sur la surface extérieure de ladite couche de métallisation. Cette condition de limite est modifiée par changement de l'index de réfraction de la couche supplémentaire (16). Des moyens permettant de changer l'index de réfraction de la couche supplémentaire (16) consistent à l'établir une résonance structurale dans la couche supplémentaire, et à former la couche supplémentaire à partir de matériaux électro-optiques ou piézo-électriques.

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