Lithographic fabrication of phase mask for fiber bragg gratings

G - Physics – 03 – F

Patent

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G03F 1/00 (2006.01)

Patent

CA 2431234

The invention provides masks (200) that form fiber Bragg gratings (FBGs) in optical fibers without stitching errors from re-scaling or re-positioning. The invention feathers the pixels of the mask lines (201, 202, 203) by adding, removing, and/or displacing one or more pixels (204, 205, 206) from the edges of the bars and spaces of the mask. The feathering of pixels will affect the FBG being written into the fiber. The feathering operates to shift the effective edge (207, 208) of the bars. This allows the achievement of much finer resolution FBGs than the pixel size of the mask.

La présente invention concerne des masques qui forment des réseaux de Bragg de fibres (FBG) dans des fibres optiques sans erreur d'assemblage due au re-dimensionnement ou au re-positionnement. Selon cette invention, on répartit les pixels des lignes de masque en ajoutant, en enlevant et/ou en déplaçant un ou plusieurs pixels des contours des barres et des espaces du masque. Cette répartition de pixels vient affecter les réseaux de Bragg de fibres dont l'inscription est en cours dans la fibre. Cette répartition a pour effet de décaler le contour effectif des barres, ce qui permet d'obtenir des réseaux de Bragg de fibres dont la résolution est nettement plus haute que celle obtenue normalement avec la taille des pixels du masque.

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