Optical fiber
AssigneeFurukawa Electric Co., Ltd.
InventorsKazunori MUKASA, Keiichi AISO
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Abstract
An optical fiber includes a core portion made of silica-based glass; and a cladding portion made of silica-based glass having lower maximum refractive index than the core portion, the cladding portion surrounding an outer periphery of the core portion. The core portion is doped with an alkali metal element and chlorine. An average concentration of chlorine is higher than 800 atomic ppm on a cross-section perpendicular to a longitudinal direction of the core portion. A region doped with the alkali metal element is larger than a region doped with chlorine at 800 atomic ppm or higher.
Claims20
An optical fiber comprising:
- a core portion made of silica-based glass;
- and
- a cladding portion made of silica-based glass having maximum refractive index lower than the core portion, the cladding portion surrounding an outer periphery of the core portion, wherein
- the core portion is doped with an alkali metal element and chlorine,
- an average concentration of the chlorine is higher than 800 atomic ppm on a cross-section of the core portion perpendicular to a longitudinal direction, and a region doped with the alkali metal element is larger than a region doped with the chlorine at 800 atomic ppm or higher.
Dependencies are inferred from the claim text.