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1. (WO2018123541) METHOD FOR PRODUCING OPTICAL FIBER PREFORM

Pub. No.:    WO/2018/123541    International Application No.:    PCT/JP2017/044377
Publication Date: Fri Jul 06 01:59:59 CEST 2018 International Filing Date: Tue Dec 12 00:59:59 CET 2017
IPC: C03B 37/014
C03B 37/012
C03B 37/018
Applicants: SUMITOMO ELECTRIC INDUSTRIES, LTD.
住友電気工業株式会社
Inventors: FUNAKOSHI Akiko
舟越 安紀子
TANAKA Satoshi
田中 佐賢
Title: METHOD FOR PRODUCING OPTICAL FIBER PREFORM
Abstract:
The present embodiment pertains to a method for producing an optical fiber preform that effectively suppresses breaking of the symmetry of the refractive index distribution defined on the cross section of the optical fiber preform. In the present embodiment, in the production of a central glass rod that constitutes a part of an optical fiber preform, before grinding the peripheral portion of an intermediate glass rod in which an element addition region is formed by collapse, non-defective intermediate glass rods to be ground are determined.