Sol-gel process for the production of optical fiber preforms
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United States of America Patent
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Apr 11, 2006
Grant Date -
Feb 6, 2003
app pub date -
Jul 16, 2002
filing date -
Aug 1, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Sol-gel process for the production of optical fiber preforms or overcladdings by preparing a sol, gelling the sol, drying the wet gel to a dry porous gel and densifying the dry gel to fully dense glass, wherein during the calcination treatment from 350° C. to 900° C. to remove organic impurities in the dry gel, it is carried out at least one reduced-pressure phase at a pressure comprised between about 0.01 and 0.5 bar.
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