Method of manufacturing an optical fiber preform having doped cladding
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United States of America Patent
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Feb 25, 1992
Grant Date -
N/A
app pub date -
Aug 2, 1990
filing date -
Aug 2, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
According to the present invention, a preform (7) for an optical fiber is made from a tube having a substrate layer (16) of fluorine-doped silica and a support layer (18) of non-doped silica. A cladding layer (8) of fluorine-doped silica and a core layer (10) of non-doped silica are formed on the inside surface of the tube by chemical vapor phase deposition. The optical fiber is subsequently obtained by collapsing the tube and drawing it. The invention is applicable to fabricating optical fibers.
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