Process for producing a glass preform for optical fiber
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United States of America Patent
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Jul 6, 1982
Grant Date -
N/A
app pub date -
Dec 19, 1980
filing date -
Dec 20, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for producing a preform for glass fiber for optical transmission by heating supply gases to form fine particles that are deposited on a rotating starter member to form an aggregate of fine glass particles which are then sintered to give a transparent vitreous material, characterized by a first heating stage wherein the aggregate of fine glass particles is sintered by increasing the temperature at a constant rate in a gaseous atmosphere which contains a halogen or halide and which has dehydrating activity, followed by holding the aggregate for a given period of time at a temperature in the range that causes considerable shrinkage of the aggregate, and a second heating stage where said aggregate is heated to the vitrifying temperature.
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