Method for manufacturing optical fiber preform and optical...

Details Method for manufacturing optical fiber preform and optical... Method for manufacturing optical fiber preform and optical...

2011-05-24

2011-05-24

Nguyen, Khanh (Department: 1746)

Glass manufacturing

Means providing special atmosphere

C065S422000, C065S424000, C065S426000

Reexamination Certificate

active

07946132

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 depositing 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 1.0×10−11g·cm/cm2·s·cmHg or less, thereby manufacturing an optical fiber preform.

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