Method of manufacturing an optical fiber preform
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United States of America Patent
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Dec 27, 1988
Issued Date -
N/A
app pub date -
Mar 20, 1987
filing date -
Feb 22, 1983
priority date (Note) -
Expired
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Abstract
While collapsing the central duct in hollow glass optical fiber preforms, an etchant consisting of a mixture of oxygen and a fluorocarbon compound from the group C.sub.2 F.sub.6, C.sub.3 F.sub.8 and N-C.sub.4 F.sub.10 is passed through the duct. In particular, the etchant is passed through the duct only when the duct's diameter is 1 mm or smaller. The resulting solid preforms and optical fibers drawn therefrom do not have a central dip in the refractive index profile.
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