| 摘要 |
PROBLEM TO BE SOLVED: To provide a glass preform for an optical fiber, whose preform ingot surface is subjected to high speed cylindrical grinding and which is free from grinding flaws causing a problem in a following process, and to provide a method for manufacturing the same. SOLUTION: In the method for manufacturing the glass preform for the optical fiber, comprising depositing glass particulates on a core material manufactured by a VAD method, by an external deposition method, then heating/melting, dehydrating/transparently vitrifying, and grinding irregularities caused on the surface of the obtained glass preform, after rough grinding, cylindrical grinding is performed using a #325-400 diamond grindstone in final finish grinding, and thereafter, grinding marks are removed by flame polishing. COPYRIGHT: (C)2005,JPO&NCIPI
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