Grating element, light wavelength selection utilizing the...

G - Physics – 02 – B

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G02B 5/18 (2006.01) G02B 6/42 (2006.01) G02F 1/01 (2006.01) G02F 1/355 (2006.01)

Patent

CA 2263065

A core section (10a) is formed in an optical fiber (10) made of a glass material and, electrodes (14a and 14b) are inserted into the clad section (10b) of the fiber (10). When the core section (10a) is irradiated with ultraviolet rays in prescribed intensity patterns while a high voltage is applied to the electrodes (14a and 14b), a grating section (16) in which non linear areas (16a) and normal areas (16b) are alternately formed is formed in the section (10a). The characteristics of the grating section (16) can be changed by utilizing an electrooptic effect by impressing a prescribed electric field upon the section (16) through the electrodes (14a and 14b). A grating element constituted in such a way can be utilized as an optical functional element, such as the wavelength switch, because the Bragg wavelength of the element changes when a voltage is applied.

Une section âme (10a) est formée dans une fibre optique (10) en verre et des électrodes (14a et 14b) sont introduites dans la section gaine (10b) de la fibre (10). En irradiant cette section âme (10a) avec des rayons ultraviolets selon des modèles d'intensités prescrits, tout en appliquant une haute tension aux électrodes (14a et 14b), il se forme dans la section (10a) une section grille de diffraction (16), dans laquelle des zones non linéaires (16a) et des zones normales (16b) sont produites en alternance. On peut modifier les caractéristiques de la section grille de diffraction (16) en utilisant un effet électro-optique par impression d'un champ électrique prescrit sur la section (16) à travers les électrodes (14a et 14b). Un élément grille de diffraction constitué de cette façon peut être utilisé comme élément fonctionnel optique, par exemple comme commutateur de longueurs d'ondes, étant donné que la longueur d'ondes de Bragg dudit élément change lors de l'application d'une tension.

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