Method of producing optical fiber preform and optical fiber
AssigneeFurukawa Electric Co., Ltd.
InventorsKeiichi AISO, Tomohiro GONDA
Life of this patent
Estimating the term…
Abstract
A method of producing an optical fiber preform includes a silica glass body forming step of forming a silica glass body to be at least a portion of a core portion. The method includes an alkali-metal-doped silica glass body forming step of forming an alkali-metal-doped silica glass body doped with an alkali metal around the silica glass body such that the alkali-metal-doped silica glass body contacts the silica glass body. The method further includes a diffusing step of diffusing the alkali metal from the alkali-metal-doped silica glass body to the silica glass body by a heat treatment.
Claims5
A method of producing an optical fiber preform, the method comprising:
- a silica glass body forming step of forming a silica glass body to be at least a portion of a core portion;
- an alkali-metal-doped silica glass body forming step of forming an alkali-metal-doped silica glass body doped with an alkali metal around the silica glass body such that the alkali-metal-doped silica glass body contacts the silica glass body;
- and
- a diffusing step of diffusing the alkali metal from the alkali-metal-doped silica glass body to the silica glass body by a heat treatment.
A method of producing an optical fiber, the method comprising drawing an optical fiber preform produced by a method of producing an optical fiber preform, the method of producing an optical fiber preform including:
- a silica glass body forming step of forming a silica glass body to be at least a portion of a core portion;
- an alkali-metal-doped silica glass body forming step of forming an alkali-metal-doped silica glass body doped with an alkali metal around the silica glass body such that the alkali-metal-doped silica glass body contacts the silica glass body;
- and
- a diffusing step of diffusing the alkali metal from the alkali-metal-doped silica glass body to the silica glass body by a heat treatment.
Dependencies are inferred from the claim text.