Optical waveguide Bragg reflection gratings
AssigneeNortel Networks Limited
InventorTerry Victor Clapp
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Abstract
An optical waveguide Bragg grating spectrally selective reflector is made by ion beam implantation through a photolithographic mask to raise locally the effective refractive index of the guide. This contrasts with the standard method, which uses UV light to raise the index through the agency of the photo-refractive effect.
Claims8
An optical waveguide having a rib of core glass supported on a layer of lower refractive index cladding glass, in which core glass rib is formed by selective ion implantation a set of localised regions of raised refractive index co-operating to constitute a Bragg reflection grating.
A method of creating an optical waveguide provided with a Bragg reflective grating, which method includes the steps of,
- forming a layer of core glass on a layer of lower refractive index cladding glass,
- providing a set of localised regions of raised refractive index in the layer of core glass by selective ion implantation, and
- selectively removing areas of the core glass layer to produce a strip waveguiding structure containing said set of localised regions.
Dependencies are inferred from the claim text.