Method for preparing mandril of optical fiber preform by adopting PCVD process
An optical fiber preform and preform technology, applied in the field of optical fiber manufacturing, can solve the problems of low humidity in the production workshop, affect the production environment, and fiber loss, and achieve the effects of avoiding refractive index disorder, avoiding pollution, and reducing OH-absorption loss
Active Publication Date: 2018-11-23
PNC PROCESS SYSTEMS CO LTD
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[0038]see figure 1 , the present invention provides a kind of method that PCVD technology makes optical fiber prefabricated core rod, it is characterized in that, carry out according to the following steps:
[0039] 1) Preparation for the deposition process, the workshop temperature is 24.1°C, and the humidity is 42%RH, which is a comfortable condition for the human body; in high-purity O 2 In the case of purging, install a clean quartz substrate tube with tail pipes welded at both ends on the PCVD deposition machine tool, gradually raise the temperature of the preheating furnace to 1080°C and keep it at a constant temperature, turn on the translation and rotation mechanisms of the deposition machine tool, and turn on the microwave Plasma power output;
[0040] 2) Use C of 150sccm to 300sccm 2 f 6 The gas etches and cleans the quartz substrate tube;
[0041] 3) According to the preset parameters of the optical fiber preform, feed SiCl 4 , O 2 and C 2 f 6 The gas depos...
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Abstract
The invention relates to the technical field of optical fiber manufacturing, particularly relates to a method for preparing a mandril of an optical fiber preform by adopting a PCVD process, which is characterized in that introducing F-containing gas outside a optical core layer and depositing out a SiO2-F glass blocking layer. Comparing with the prior art, the pollution of environment moisture onthe optical core layer is avoided during a process of moving a hollow preform to a melting lathe, the introduced OH-pollution due to preform moving in a craft process for preparing the preform by adopting the PCVD process is effectively eliminated, so that the OH-absorption loss in the optical fiber preform is reduced, the dependence of a PCVD process workshop on the environment humidity is greatly reduced, a novel means is provided for preparing a low water peak and a water-free peak, a turbulence of a refractive index of the optical fiber due to the excessive evaporation of Ge in a optical fiber center in a melt-shringking can be prevented, and certain improving effect of mode bandwidth characteristics of the optical fiber is realized.
Description
technical field [0001] The invention relates to the technical field of optical fiber manufacturing, in particular to a method for manufacturing an optical fiber prefabricated core rod by a PCVD process. Background technique [0002] see figure 2 , in the optical fiber preform core rod manufacturing process, the PCVD process is a well-known preform core rod manufacturing process, including two processes of deposition process and shrinkage process. In SiO 2 -GeO 2 -F during the deposition process of optical fiber preforms, SiCl 4 , GeCl 4 , O 2 And other such as F-containing dopant gas is passed into the substrate tube located in the preheating furnace with a temperature above 1000 ° C, and under the action of high-energy microwave plasma, microwave plasma chemical vapor deposition reaction is carried out on the inner wall of the substrate tube to form a A layer of transparent quartz glass is deposited with a predetermined waveguide structure, and finally a hollow prefor...
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IPC IPC(8): C03B37/018
CPCC03B37/018Y02P40/57
Inventor 连海洲沈一林孙效义
Owner PNC PROCESS SYSTEMS CO LTD