Optical fiber glass preform and method for manufacturing optical fiber glass preform
AssigneeShin-Etsu Chemical Co., Ltd.
InventorRyo Mitta
Life of this patent
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Abstract
Provided is an optical fiber glass preform in which a starting rod and a dummy glass are hardly separated from each other, and a method for manufacturing the glass preform. In the optical fiber glass preform, the dummy glass is fitted into one end of the starting rod, and a part of the dummy glass and the starting rod are surrounded by a clad glass. In the manufacturing method, at the time of connecting the starting rod and the dummy glass, a shape is adjusted in such a manner that an iron is brought into contact with a connection portion and is moved from a starting rod side toward a dummy glass side with appliance of a load.
Claims6
A method for manufacturing an optical fiber glass preform, the method comprising:
- heating and joining one end of a starting rod and one end of a dummy glass facing each other;
- forming a large diameter portion having an outer diameter larger than those of the dummy glass and the starting rod at a joining portion between the starting rod and the dummy glass, a joint between the one end of the starting rod and the one end of the dummy glass being included in the large-diameter portion;
- bringing a processing iron into contact with the large-diameter portion and moving the processing iron from a starting rod side of the large diameter portion toward a dummy glass side while applying a load to form the joint where a joining end of the dummy glass is fitted into a joining end of the starting rod;
- depositing a glass particle layer on an outer periphery of the dummy glass and the starting rod;
- and
- heating the glass particle layer to be transparent.
Dependencies are inferred from the claim text.