Apparatus and method for producing fibre bragg gratings in a...

G - Physics – 02 – B

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G02B 5/18 (2006.01)

Patent

CA 2452694

An optical waveguide Bragg grating fabrication apparatus comprises a light source providing ultra-violet(UV) light and optical means for adapting the light beam to form an interference pattern in a photosensitive optical waveguide. The interference pattern has a spatial intensity modulation along the length of the optical waveguide and thus providing an optical grating in the waveguide in the form of a refractive index modulation. The optical means comprises a movable non-uniform diffractive mask for dividing the optical beam in at least two beams and optical elements for collecting two or more of the light beams to interfere on the optical waveguide. The optical means comprises position control means for controlling the position of at least one mirror or lens. Corresponding methods and the use of a super-periodic diffractive mask in such fabrication are described.

L'invention concerne un appareil de fabrication de réseaux de Bragg (1) pour guides d'ondes optiques, comprenant une source de lumière (2) fournissant une lumière ultraviolette (UV) et un dispositif optique (4, 5A-B, 6A-B, 7A-B, 9) destiné à transformer le faisceau de lumière en une figure d'interférence dans un guide d'ondes optique photosensible (8). La figure d'interférence permet d'obtenir une modulation spatiale de l'intensité le long du guide d'ondes optique et par conséquent un réseau optique dans le guide d'ondes, sous forme d'une modulation de l'indice de réfraction. Le dispositif optique comprend un masque de diffraction (4) non uniforme, mobile, destiné à séparer le faisceau optique en au moins deux faisceaux (12A-B) et des éléments optiques destinés à collecter au moins deux des faisceaux de lumière pour les faire interagir avec le guide d'ondes optique. Le dispositif optique comprend un dispositif de commande de position permettant d'orienter au moins un miroir ou une lentille. L'invention concerne également des procédés correspondants et l'utilisation d'un masque super-périodique de diffraction.

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