Variable period amplitude grating mask and method for use

Details Variable period amplitude grating mask and method for use Variable period amplitude grating mask and method for use

G - Physics

02

F

G02F 1/225 (2006.01) G02B 5/18 (2006.01) G02B 6/10 (2006.01) G02B 6/34 (2006.01)

Patent

CA 2225316

A variable period amplitude grating mask for use in making a long period Bragg grating is realized by a helically coiled spring. Stretching or compressing the spring changes the periodicity of the mask. A photosensitive optical waveguide, planar or fiber, is positioned within the spring coils along the major axis of the spring. Actinic radiation is incident on the masked waveguide, and induces an index perturbation in the waveguide having the periodicity of the mask. Different spring coil sizes and/or orientation of the waveguide with respect to the mask provide linear and nonlinear (chirped) grating periods. A device and method are described.

Masque de réseau d'amplitude à période variable, conçu pour constituer un réseau de Bragg de longue période et créé au moyen d'un ressort hélicoïdal. On modifie la périodicité du masque en étirant ou en comprimant ce ressort. Un guide d'onde optique photosensible, planaire ou à fibres, est placé dans les spires du ressort suivant son axe principal. Le rayonnement actinique, qui est incident sur ce guide d'onde masqué, provoque une perturbation de l'indice du guide qui a la périodicité du masque. En faisant varier la dimension des spires du ressort et/ou l'orientation du guide d'onde par rapport au masque, on produit des périodes de réseau linéaires et non linéaires (comprimées). Il est également question d'un dispositif et d'une méthode.

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