Method for the production of glass preform for optical fibers.

摘要

O A method for producing a glass preform for optical fibers by heating a glass soot preform consisting of glass fine particles made mainly of silicon oxide, which method comprises the steps of:
<UnorderedLists id="ula01" listStyle="none"><ListItem>(1) heating the glass soot preform to dehydrate and to remove impurities therefrom;</ListItem><ListItem>(2) heating the glass soot preform in a gas atmosphere containing at least fluorine or fluorine-based compound to add fluorine to the glass soot preform; and</ListItem><ListItem>(3) heating the glass soot preform to make it transparent, from the transparent preform prepared by this method, an optical fiber having superior transmission characteristics can be prepared.</ListItem></UnorderedLists>