MANUFACTURING APPARATUS FOR OPTICAL FIBER BASE MATERIAL

摘要

PURPOSE:To obtain a base material with less fluctuation in the refractive index distribution by setting a burner so that it is turned around the axial line of a rodlike substrate when sootlike glass fine particles are deposited and grown on the substrate tip with the burner. CONSTITUTION:Burner 46 is turned clockwise, and rodlike substrate 11 is rotated counterclockwise and pulled at a predetermined speed. Glass starting materials from hose 32 and fuel gas are fed to burner 46. The glass starting materials, etc. spouted from burner 46 turning along a circle drawn around rotating central shaft (l) of substrate 11 react and synthesize sootlike glass fine particles. The particles deposit on the lower end of substrate 11. By growing this deposit, porous glass preform 55 with uniform diameter and no unevenness for manufacturing an optical fiber is obtd.