Method of fabricating Bragg gratings using a silica glass phase grating mask and mask used by same
AssigneeHer Majesty the Queen in right of Canada, as represented by the Minister of Communications
InventorsKenneth O. Hill, Bernard Y. Malo, Francois C. Bilodeau, Derwyn C. Johnson
Life of this patent
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Abstract
An index grating is imprinted in the core of an optical fiber using a specially designed silica glass phase grating mask. The phase mask is held in close proximity to the optical fiber. Laser irradiation of the phase mask with ultraviolet light at normal incidence imprints (photoinduces) into the optical fiber core the interference pattern created by the phase mask.
Claims29
A method of fabricating Bragg gratings in the interior of an optical waveguide comprising disposing a silica glass phase grating mask adjacent and parallel to a photosensitive optical waveguide and applying a single collimating light beam through the mask to said medium.
A grating mask comprising a slab of silica glass having parallel corrugations on a surface thereof forming a surface relief pattern, the pattern containing variations in at least one of pitch and amplitude of the corrugations.
A grating means comprising a slab of silica glass having parallel corrugations on a surface thereof forming a surface relief pattern, including a spacial amplitude light filter coated on a surface of the slab opposite to the surface carrying said pattern.
A grating means comprising a slab of silica glass having parallel corrugations on a surface thereof forming a surface relief pattern, in which the corrugation are filled with transparent material having an index of refraction different from that of the silica glass.
Dependencies are inferred from the claim text.