Method for producing quartz glass preform for optical fibers
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United States of America Patent
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Issued Date -
Aug 29, 2002
app pub date -
Jan 31, 2002
filing date -
Feb 1, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method for producing a large quartz glass preform for optical fibers having a low ellipticity at a low cost is provided. The method comprises a heating and stretching of a large quartz glass cylinder or a preform in which a core rod is inserted in said quartz glass cylinder without being integrated with the cylinder in non-contact state, using a heating furnace equipped with a carbon-made heating element, whereby setting the ratio (d/D) of the outer diameter (D) of the large quartz glass cylinder and the inner diameter (d) of the heating element to a range of from 1.02 to 1.5, and blowing in an inert gas from the upper part of the heating furnace (FIG. 1)
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