Method for producing a preform for drawing optical fibers
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United States of America Patent
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-
Jan 13, 1987
Grant Date -
N/A
app pub date -
May 23, 1985
filing date -
May 26, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A process is disclosed for making a preform from which optical fibers may be drawn, comprising forming a tubular glass body having a hollow center and concentric layers, at least one layer being a doped layer, and each layer having different indices of refraction. A partial vacuum is formed within the interior of the tubular glass body, at least part of the glass body is softened by heating, and the softened portions of the tubular glass body are collapsed to form a preform. The pressure of the partial vacuum is selected to effectively eliminate a dip in the index of refraction of any glass fiber drawn from the preform.
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