A method for preparing an optical fiber preform and drawing an optical fiber

Abstract

The invention relates to a method for preparing an optical fiber preform rod and drawing an optical fiber. It uses a heating furnace device as a heat source, and a quartz crucible container containing SiO 2 A glass-based rod is filled with high-purity quartz sand or a mixture of quartz sand doped with F or B and other elements into the aforementioned container, melted at high temperature and drawn out of the SiO core containing the core. 2 The outer periphery of the glass rod has SiO 2 Optical fiber preforms with cladding or quartz sand mixture outer cladding doped with elements such as F or B can also be directly drawn out of optical fiber products by adjusting the drawing process parameters.

Description

technical field

[0001] The invention relates to a method for preparing an optical fiber preform rod and drawing an optical fiber. Background technique

[0002] At present, the production of optical fiber preforms mostly adopts a two-step method, that is, to manufacture the core rod first, and then use different technologies to manufacture the outer cladding outside the core rod. Outer cladding technology mainly includes OVD, VAD and other process methods. OVD and VAD technology need to use SiCl on the periphery of the mandrel 4 Chemical vapor deposition as the main raw material to form SOOT body, and then in Cl 2 dehydration under the same conditions and generate a large amount of HCl harmful gas at the same time, and then complete sintering and vitrification under the protection of helium. Each of the above steps needs to be carried out in a separate process device. The equipment, process and environmental protection requirements are very strict, and the process cost, ma...

Images