Method for producing glass preform for single mode optical...

Details Method for producing glass preform for single mode optical... Method for producing glass preform for single mode optical...

C - Chemistry, Metallurgy

03

B

117/85

C03B 37/018 (2006.01) A61K 39/00 (2006.01)

Patent

CA 1240214

- 1 - Abstract: The invention provides a method for producing a glass preform for a single mode optical fiber comprising a core and a cladding. The method involves depositing fine glass particle of a glass raw material onto the periphery of a cylindrical seed member having a smooth and clean outer surface by flame hydrolysis to form a tube-like soot layer of the fine glass material. The seed member is pulled out from the soot layer and a core glass rod is inserted into the hollow portion of the soot layer. The composite of the core rod and the cladding are dehydrated and sintered to produce a glass preform from which a single mode optical fiber having low attenuation of light transmission, partic- ularly that due to absorption by hydroxyl groups, can be fabricated.

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