Optical fiber
AssigneeSumitomo Electric Industries, Ltd.
InventorsHirotaka Sakuma, Yoshiaki Tamura, Yuki Kawaguchi, Masato Suzuki
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Abstract
An optical fiber is formed from silica-based glass. The optical fiber includes a core including a central axis and a cladding surrounding the core. A refractive index of the core is greater than a refractive index of the cladding. The core contains chlorine, and one or more kinds of elements selected from an element group consisting of alkali metal elements and alkaline earth metal elements. A relative refractive index difference of the core based on a refractive index of pure silica is 0.00% or greater and 0.15% or less. An average concentration of fluorine in the cladding is 1.2% or less in a mass fraction.
Claims10
An optical fiber formed from silica-based glass, the optical fiber comprising:
- a core including a central axis;
- and
- a cladding surrounding the core,
- wherein a refractive index of the core is greater than a refractive index of the cladding,
- the core contains chlorine, and one or more kinds of elements selected from an element group consisting of alkali metal elements and alkaline earth metal elements,
- a relative refractive index difference of the core based on a refractive index of pure silica is 0.00% or greater and 0.15% or less, and
- wherein in the cladding, the average concentration of fluorine in a region where a distance from the central axis is one to two times a radius of the core is 1.2% or less in a mass fraction.
An optical fiber formed from silica-based glass, the optical fiber comprising:
- a core including a central axis;
- and
- a cladding surrounding the core,
- wherein a refractive index of the core is greater than a refractive index of the cladding,
- the core contains chlorine, and one or more kinds of elements selected from an element group consisting of alkali metal elements and alkaline earth metal elements,
- a relative refractive index difference of the core based on a refractive index of pure silica is −0.15% or greater and 0.05% or less, and
- wherein in the cladding, the average concentration of fluorine in a region where a distance from the central axis is one to two times a radius of the core is 1.4% or less in a mass fraction.
Dependencies are inferred from the claim text.