Manufacturing method of optical fiber base material and manufacturing method of optical fiber using this

摘要

PROBLEM TO BE SOLVED: To provide a method for manufacturing an optical fiber base material capable of improving the yield of an optical fiber base material. SOLUTION: A soot forming step of heating a part of a quartz tube while supplying a raw material of glass particles and a raw material gas containing oxygen into a quartz tube through a gas supply nozzle to form a soot containing glass particles, and quartz. A deposit heating step that heats the deposits generated on the gas supply nozzle side of the quartz tube while supplying an oxygen-containing gas containing oxygen into the tube, and the soot is sintered to form a core layer. A method for producing an optical fiber base material, which comprises a sintering step for obtaining a hollow base material. [Selection diagram] Fig. 4