Writing bragg reflection gratings in optical waveguides

G - Physics – 02 – B

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G02B 5/26 (2006.01) G03F 7/20 (2006.01)

Patent

CA 2247744

Instead of a single beam, two coherent beams of light are used to illuminate a phase grating in spatially separated zones for writing a Bragg reflection grating in an underlying optical (fibre) waveguide. Close proximity between phase grating and waveguide is not required. This facilitates the use of masking so that only two different diffracted orders contribute to the fringe pattern that generates the Bragg grating, thereby improving fringe contrast and reducing the deleterious spectral effects upon the reflectivity of the Bragg reflector occasioned by the presence of stitch errors in the phase grating.

Au lieu d'un seul faisceau, deux faisceaux de lumière cohérents sont utilisés pour illuminer un réseau de phase dans des zones spatialement séparées en vue de l'inscription d'un réseau de réflexion de Bragg dans un guide d'onde optique sous-jacent. La proximité immédiate entre le réseau de phase et le guide d'onde n'est pas obligatoire, ce qui facilite l'utilisation du masquage de sorte à ce que seulement deux ordres diffractés différents contribuent au motif de franges qui produit le réseau de Bragg, améliorant ainsi le contraste des franges et réduisant les effets spectraux néfastes sur la réflectivité du réflecteur de Bragg causés par la présence d'erreurs de piquage dans le réseau de phase.

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