Optical fiber and fiber grating device
AssigneeSumitomo Electric Industries, Ltd.
InventorsToshiki Taru, Shinji Ishikawa, Akira Inoue
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Abstract
An optical fiber comprises a core region, an inner cladding region, and an outer cladding region. Each of the core region and inner cladding region is doped with GeO2, whereas the inner cladding region is also doped with F element. The core region has a refractive index higher than each of the refractive index of the inner cladding region and the refractive index of the outer cladding region. Each of the core region and inner cladding region doped with GeO2 has a UV photosensitivity. The deviation in concentration distribution of GeO2 added to the inner cladding region is so small that the deviation in UV photosensitivity in the inner cladding region is ±10% or less.
Claims5
An optical fiber comprising:
- a core region having a first refractive index with a UV photosensitivity;
- an inner cladding region surrounding said core region and having a second refractive index lower than said first refractive index with a UV photosensitivity;
- and
- an outer cladding region surrounding said inner cladding region and having a third refractive index lower than said first refractive index;
- where in said UV photosensitivity in said inner cladding region has a deviation of ±10% or less.
Dependencies are inferred from the claim text.