Optical fiber
AssigneeSumitomo Electric Industries, Ltd.
InventorsHirotaka Sakuma, Yoshiaki Tamura, Yuki Kawaguchi, Masato Suzuki
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Abstract
One embodiment of the present disclosure relates to an optical fiber having lower transmission loss. The optical fiber is an optical fiber comprised of silica-based glass and includes a core including a central axis and a cladding. The cladding surrounds the core and has a refractive index lower than a refractive index of the core. The core contains phosphorus, chlorine, and fluorine. The core further includes an alkali metal element or an alkaline earth metal element. In a cross section of the optical fiber orthogonal to the central axis, a ratio Rp/Ra of a radius Rp of a phosphorus-containing region with respect to a radius Ra of the core is 0.3 or more.
Claims10
An optical fiber comprised of silica-based glass, the optical fiber comprising:
- a core including a central axis;
- and a cladding surrounding the core and having a refractive index lower than a refractive index of the core, wherein
- the core contains phosphorus, chlorine, and fluorine, the core containing an alkali metal element or an alkaline earth metal element, and
- a phosphorus-containing region containing the phosphorus is set in such a manner that a ratio Rp/Ra of a radius Rp of the phosphorus-containing region with respect to a radius Ra of the core is 0.3 or more, in a cross section of the optical fiber orthogonal to the central axis.
Dependencies are inferred from the claim text.