SYSTEM AND METHOD FOR MANUFACTURING OPTICAL FIBRE BY MODIFIED CHEMICAL VAPOR DEPOSITION

摘要

PURPOSE: A system and method are to manufacture the preform for optical fiber by a modified chemical vapor deposition. CONSTITUTION: The system has a heating apparatus consisting of two heaters arranged in the way of one after the other to move in a direction while heating the optical fibre substrate tube in spinning. The first heater heats the substrate tube by the spreading flame of low pressure and the second one follows the first one to heat the tube by the concentrated flame of high flame pressure. The method flows the raw material gas and oxygen into the substrate tube to be heated by the first heater for the gas to make thermal reaction for oxidation to form a deposition of a cladding layer and a core layer on the inner side of the tube. A collapse process follows to heat the deposition tube and collapse it for the preform.