Method for manufacturing optical fiber preform and optical fiber preform apparatus
AssigneeFujikura Ltd.
InventorsManabu Saitou, Shunichirou Hirafune
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Abstract
A method for manufacturing an optical fiber preform and an optical fiber preform apparatus are provided which can reduce hydroxyl groups in an optical fiber preform to a sufficient level without requiring any special equipment or operating conditions. When an optical fiber preform is manufactured by the vapor-phase deposition method, the dehydrating treatment is performed on a porous core preform that is obtained by deposing glass microparticles. In this treatment, a dehydrating agent is supplied to a dehydration apparatus through a feeding pipe and a main feeding pipe made of a material having a water permeance factor of 1.0×10−11 g·cm/cm2·s·cmHg or less, thereby manufacturing an optical fiber preform.
Claims13
A method for manufacturing an optical fiber preform, comprising:
- providing a porous glass preform obtained by a vapor-phase deposition method;
- and
- performing a dehydrating treatment using a dehydrating agent,
- wherein the dehydrating treatment is performed using the dehydrating agent supplied through a pipe made of a synthetic resin and having a water permeance factor of 1.0×10−11 g·cm/cm2·s·cmHg or less at 40° C., and
- an outside of the pipe through which the dehydrating agent flows is surrounded by a spacing, and a gas having a dew point of −80° C. or less is flowed through the spacing.
Dependencies are inferred from the claim text.