Method for producing optical fiber base material, and optical fiber base material
AssigneeSumitomo Electric Industries, Ltd.
InventorsHirotaka Sakuma, Yuki Kawaguchi
Life of this patent
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Abstract
A method for manufacturing an optical fiber preform includes: adding an alkali metal element or an alkaline earth metal element to an inner surface of a glass pipe made of silica-based glass; reducing a diameter of the glass pipe after the adding; etching an inner surface of a continuous section of the glass pipe in a longitudinal direction after the reducing; and collapsing the glass pipe after the etching. At least one of the adding, the reducing, the etching, and the collapsing includes performing a local etching on an inner surface of a section of the glass pipe that is shorter than the continuous section.
Claims7
A method for manufacturing an optical fiber preform, the method comprising:
- adding an alkali metal element or an alkaline earth metal element to an inner surface of a glass pipe made of silica-based glass;
- reducing a diameter of the glass pipe after the adding;
- etching an inner surface of a continuous section of the glass pipe in a longitudinal direction after the reducing;
- collapsing the glass pipe after the etching;
- and
- performing a local etching on an inner surface of a section of the glass pipe that is shorter than the continuous section at least one of between the adding and the reducing, between the reducing and the etching, and between the etching and the collapsing,
- wherein the local etching is performed on one or more places other than the continuous section.
Dependencies are inferred from the claim text.