METHOD FOR PRODUCING GLASS PREFORM FOR OPTICAL FIBER
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United States of America Patent
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N/A
Issued Date -
Feb 1, 2018
app pub date -
Jul 26, 2017
filing date -
Jul 29, 2016
priority date (Note) -
Published
status (Latency Note)
Importance
Abstract
Provided is a method for producing a glass preform for optical fiber which suppresses occurrences of cracks, coloring and foaming in a surface layer when sintering a glass fine particle deposit to allow a production yield to be improved. A method for producing a glass preform for optical fiber comprising the steps of: spraying glass fine particles containing silicon dioxide and germanium dioxide to a starting material moving upward while rotating to produce a glass fine particle deposit; and sintering the glass fine particle deposit while relatively varying a positional relationship between a heating source and the glass fine particle deposit in a sintering apparatus to produce a transparent glass preform, wherein a germanium dioxide reducing gas is contained in an atmosphere gas in the sintering apparatus.
First Claim
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