METHOD FOR MANUFACTURING OPTICAL FIBER PREFORM

摘要

PROBLEM TO BE SOLVED: To provide a method for manufacturing an optical fiber preform free from manufacturing defect such as the slippage or stripping between a core part and a clad part in the optical fiber preform obtained by sintering of a porous materials for the optical fiber. SOLUTION: In the method for manufacturing the optical fiber preform which is performed by depositing glass fine particles in a radial direction on the outer circumferential part of a cylindrical starting member 1 provided with a glass material to be the core part to form a porous layer 2 to make the porous material for the optical fiber and sintering the porous material for the optical fiber, a heating process for heating the surface of the starting member 1 is provided directly before a process for forming the porous layer 2. The surface temperature of the starting member 1 is controlled to≥600°C by heating in the heating process and the surface temperature of the porous layer 2 in the deposition of the glass fine particles is controlled to 800-1150°C in the process for forming the porous layer 2. COPYRIGHT: (C)2003,JPO