Method for manufacturing preform and preform
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsHiroshi Oyamada, Tetsuya Otosaka
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Abstract
A method for manufacturing a preform, which is a base material of an optical fiber, comprising: forming porous-glass-base-material by accumulating glass particles; dehydrating the porous-glass-base-material by heating the porous-glass-base-material in an atmosphere of gas that contains chlorine; heating the porous-glass-base-material dehydrated by the dehydrating with a first heating temperature in an atmosphere of a first inert gas; and vitrifying the porous-glass-base-material by heating the porous-glass-base-material with a second heating temperature in an atmosphere of second inert gas.
Claims23
A method for manufacturing a preform, which is a base material of an optical fiber, comprising:
- forming porous-glass-base-material by accumulating glass particles;
- dehydrating said porous-glass-base-material by heating said porous-glass-base-material in an atmosphere of gas that contains chlorine;
- heating said porous-glass-base-material dehydrated by said dehydrating with a first heating temperature in an atmosphere of a first inert gas;
- and
- vitrifying said porous-glass-base-material by heating said porous-glass-base-material with a second heating temperature in an atmosphere of second inert gas.
A preform, which is a base material of an optical fiber, comprising:
- a cylindrical core;
- and
- a clad formed around said outside surface of said core;
- wherein:
- a content of hydroxyl (OH) group of said clad is substantially 0.8 ppb or less.
Dependencies are inferred from the claim text.