METHOD FOR PRODUCING SILICA GLASS PREFORM FOR OPTICAL FIBER
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United States of America Patent
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N/A
Issued Date -
Jul 28, 2016
app pub date -
Nov 6, 2014
filing date -
Nov 28, 2013
priority date (Note) -
Published
status (Latency Note)
Importance
Abstract
A method for producing a silica glass preform for an optical fiber includes processes for producing a silica glass soot body having a core portion added with a positive dopant and an intermediate portion having a refractive index lower than that of the core portion, heating the soot body at a temperature for transparently vitrifying the same in a helium atmosphere containing a negative dopant and forming a first core rod having the intermediate portion added with the negative dopant, giving a silica glass soot layer as a trench portion to an outer circumference of the first core rod, heating the soot layer at a temperature for transparently vitrifying the same in the helium atmosphere and forming a second core rod having the trench portion added with the negative dopant, and giving silica glass as a cladding portion to an outer circumference of the second core rod.
First Claim
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