Apparatus and method for manufacturing an optical fiber preform by modified chemical vapour deposition

摘要

An apparatus and method for manufacturing an optical fiber preform by MCVD is disclosed. In the preform manufacturing apparatus, a cylindrical deposition tube receives a source gas through one end and discharges the source gas through the other end. A first heat source (262) is mounted to a guide and forms a first high temperature area (330) inside the deposition tube by heating the outer circumferential surface of the deposition tube. A second heat source (266) is mounted to the guide, apart from the first heat source by a predetermined distance along the length direction of the deposition tube, and forms a second high temperature area (333) inside the deposition tube by heating the outer circumferential surface of the deposition tube. A heat source mover moves the first and second heat sources (262,266), maintaining the distance between the first and second heat sources. <IMAGE>