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US 7,493,009 B2Granted
Optical fiber with tin doped core-cladding interface
AssigneeBaker Hughes Incorporated
InventorDaniel S. Homa
Life of this patent
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Abstract
The present invention concerns an optical fiber 10 comprising a substantially pure silica glass core 12, a concentric tin-doped core/cladding interface region 14, and a concentric fluorine-doped depressed cladding layer 16. The tin-doped core/cladding interface region 14 comprises a low concentration gradient of tin dioxide, which advantageously results in a de minimis refractive index change, resistance to hydrogen incursion, and thermal stability of any fiber Bragg gratings written into the interface region 14.
Claims22
An optical fiber comprising:
- a core comprising a first substantially pure silica core region and a second interface region surrounding the first substantially pure silica core region;
- and
- a depressed-index cladding layer concentrically surrounding the core
- wherein the second interface region has a photosensitizing dopant comprising tin, and wherein at least one fiber Bragg grating is formed within the second interface region.
1 more element
An optical fiber comprising:
- a substantially pure silica core;
- a depressed-index cladding layer concentrically surrounding the substantially pure silica core;
- and
- an interface layer disposed between the substantially pure silica core and the depressed-index cladding layer, wherein the interface layer has a photosensitizing dopant comprising tin, and wherein the concentration of photosensitizing dopant varies within the interface layer.
1 more element
An optical fiber comprising:
- a core comprising a first substantially pure silica core region and a second interface region surrounding the first substantially pure silica core region;
- and
- a depressed-index cladding layer concentrically surrounding the core,
- wherein the second interface region has a photosensitizing dopant comprising tin, and
- wherein the photosensitizing dopant raises a refractive index n1 of the second interface region to a value less than about 0.006 relative to a refractive index n2 of pure silica.
2 more elements
Dependencies are inferred from the claim text.