Method for making a preform as well as a fibre obtained from such a preform
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United States of America Patent
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N/A
Issued Date -
Nov 13, 2003
app pub date -
Apr 8, 2003
filing date -
Jul 16, 1999
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention relates to a method for producing a perform, which is substantially free of PH impurities, for an optical fibre, wherein one or more quartz layers, which may or may not be doped, are deposited on the internal surface of a quartz glass support tube, in which method a furnace is move axially with respect to the support tube, and after the quartz layers have been deposited the support tube is contracted into a bar-shaped perform while being heated, wherein the furnace comprises an electrical resistance furnace, in which furnace the support tube is rotated, with the space between the rotating support tube and the furnace being washed with an inert gas.
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