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A shrinking method for making optical fiber preform

An optical fiber preform and quartz technology, which is used in manufacturing tools, glass manufacturing equipment, etc., can solve the problems of ellipse and unbalanced shrinkage of optical fiber preform, and achieve the advantages of avoiding ellipse shrinkage, improving processing quality and ensuring uniformity. Effect

Active Publication Date: 2021-02-02
CHENGDU FUTONG OPTICAL COMM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved and the technical task proposed by the present invention are to improve the prior art, provide a shrinkage method for making an optical fiber preform, and solve the shrinkage problem in the current technology when the deposited quartz substrate tube is shrunk. Unbalanced, it is easy to cause the problem that the optical fiber preform becomes elliptical

Method used

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  • A shrinking method for making optical fiber preform

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A. Deposition: high-purity gas SnCl 4 、GeCl 4 , POCl 3 Fluorine etc. and carrier gas O 2 Together, they pass from the gas guide tube 3 into the through hole 2 of the quartz substrate tube 1 rotating around the axis, and the high-temperature hydrogen-oxygen torches are arranged outside the tube of the quartz substrate tube 1 along the axial direction of the quartz substrate tube 1 from one end of the gas guide tube 3 to the rear. One end of the pipeline 4 moves, so that the substance in the tube undergoes an oxidation reaction at high temperature to form a dusty oxide SiO 2 or GeO 2 etc., and deposited on the inner wall of the quartz substrate tube 1, the blowtorch continues to move downstream, and when passing through the loose body that has just been deposited, vitrifies the loose body into a transparent glass body. After the blowtorch reaches the tail of the quartz substrate tube 1, Quickly return to the quartz substrate tube 1 to start the next pass of deposition...

Embodiment 2

[0032] A. Deposition: high-purity gas SnCl 4 、GeCl 4 , POCl 3 Fluorine etc. and carrier gas O 2 Together, they pass from the gas guide tube 3 into the through hole 2 of the quartz substrate tube 1 rotating around the axis, and the high-temperature hydrogen-oxygen torches are arranged outside the tube of the quartz substrate tube 1 along the axial direction of the quartz substrate tube 1 from one end of the gas guide tube 3 to the rear. One end of the pipeline 4 moves, so that the substance in the tube undergoes an oxidation reaction at high temperature to form a dusty oxide SiO 2 or GeO 2 etc., and deposited on the inner wall of the quartz substrate tube 1, the blowtorch continues to move downstream, and when passing through the loose body that has just been deposited, vitrifies the loose body into a transparent glass body. After the blowtorch reaches the tail of the quartz substrate tube 1, Quickly return to the quartz substrate tube 1 to start the next pass of deposition a...

Embodiment 3

[0037] A. Deposition: high-purity gas SnCl 4 、GeCl 4 , POCl 3 Fluorine etc. and carrier gas O 2 Together, they pass from the gas guide tube 3 into the through hole 2 of the quartz substrate tube 1 rotating around the axis, and the high-temperature hydrogen-oxygen torches are arranged outside the tube of the quartz substrate tube 1 along the axial direction of the quartz substrate tube 1 from one end of the gas guide tube 3 to the rear. One end of the pipeline 4 moves, so that the substance in the tube undergoes an oxidation reaction at high temperature to form a dusty oxide SiO 2 or GeO 2 etc., and deposited on the inner wall of the quartz substrate tube 1, the blowtorch continues to move downstream, and when passing through the loose body that has just been deposited, vitrifies the loose body into a transparent glass body. After the blowtorch reaches the tail of the quartz substrate tube 1, Quickly return to the quartz substrate tube 1 to start the next pass of deposition...

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Abstract

The invention discloses a rod shrinkage method for making optical fiber prefabricated rods. The raw material gas is passed into the through hole of the quartz substrate tube from one end of the quartz substrate tube, and the other end of the quartz substrate tube is connected with a tail pipe, which is also connected with Compensation gas pipeline, the compensation gas pipeline feeds gas into the tail pipe to make the through hole of the quartz substrate tube into a positive pressure, the blowtorch heats the quartz substrate tube to make the raw material react and deposit on the inner wall of the through hole of the quartz substrate tube, after the deposition is completed The quartz substrate tube is heated by a blowtorch to form a molten glass body that collapses inwards to form a solid optical fiber preform. The present invention compensates the gas drawn out from the exhaust pipeline by compensating the gas pipeline during deposition, and ensures positive pressure in the through hole of the quartz substrate tube during the deposition process, thereby offsetting the shrinkage force of the quartz tube and ensuring uniform deposition. The inner cladding and core layer prevent the optical fiber preform from shrinking into an ellipse and improve the processing quality.

Description

technical field [0001] The invention relates to the field of optical fiber technology, in particular to a shrinkage method for making an optical fiber preform. Background technique [0002] The MCVD method is a method in which high-purity useful gas with oxygen as the carrier is used in a rotating quartz substrate tube to obtain solid-phase deposition by high-temperature vapor-phase oxidation reaction. High-purity gas SiCl 4 、GeCl 4 and carrier gas O 2 Send them together into the rotating quartz substrate tube, and the high-temperature hydrogen-oxygen flame moves back and forth outside the tube, causing the material in the tube to oxidize at high temperature to form dust-like oxide SiO 2 or GeO 2 etc., and deposited on the inner wall of the tube, when the high-temperature zone of the flame passes through here again, a uniform and transparent quartz glass film layer is formed on the inner wall of the tube, and chlorine gas and unreacted materials are discharged from the t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B37/014
CPCC03B37/0144C03B37/01466
Inventor 李庆国吴雯雯李代军孙可元
Owner CHENGDU FUTONG OPTICAL COMM TECH
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