METHOD OF PRODUCING OPTICAL FIBER PREFORM AND OPTICAL FIBER PREFORM

摘要

PROBLEM TO BE SOLVED: To provide a glass molding for optical fibers which allows controlling important structural parameters with high dimensional precision, its production method and a method of producing an optical fiber preform.SOLUTION: A method of producing a glass molding for optical fibers comprises arranging a core metal rod at the center of a container, injecting a mixed liquid for a clad layer comprising a hardenable resin and particles of SiOand a hardening agent into the container, after the mixed liquid for a clad layer solidifies by a self-hardening reaction, removing the container and the core metal rod from the solidified body to form a hole for core insertion, drying the solidified body and heating the dried solidified body at high temperatures in a chlorine gas atmosphere while causing He gas to flow.