Apparatus and method for manufacturing an optical fiber preform

摘要

The apparatus comprises a first heater (32) with a low flame pressure located at the front with respect to the direction of movement of the rotating tube (35) and a second burner (33), behind the first one, with a high flame pressure. An Independent claim describes a method for forming an optical fiber preform using modified chemical vapor deposition (MCVD) using an apparatus as described above to heat the tube while a source gas and oxygen are passed through the tube, the first heater causing a soot to be deposited on the tube wall and the second heater causing the tube to collapse to form the optical fiber preform.