Preparation method of fluorine-doped precast rod

A technology for preforms and optical fiber preforms, applied in glass manufacturing equipment, manufacturing tools, etc., can solve the problems of difficult preparation of fluorine-doped preforms, and achieve the effect of flexible design and simple preparation

Inactive Publication Date: 2015-04-29
CHINA ELECTRONICS TECH GRP NO 46 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the domestically adopted MCVD (meteorological deposition) technology uses a fluorine-doped tube to sleeve a quartz rod, the fluorine in the fluorine-doped tube leaks out due to the high temperature. Therefore, it is not easy to prepare a fluorine-doped preform by using the traditional process.

Method used

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  • Preparation method of fluorine-doped precast rod

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: refer to figure 1 , the preparation method of the present embodiment comprises the following steps:

[0018] (1) Treat the fluorine-doped base tube with a ΔN of 0.28 and an outer diameter of 30mm and the large and small support tubes at both ends with acid water, clamp the fluorine-doped base tube 4 on the rear chuck of the MCVD glass lathe, and place the large and small support tubes respectively The support tube 1 and the small support tube 5 are clamped on the front chuck of the MCVD glass lathe, 2000ml / min oxygen is introduced into the reaction tube as a protective gas, the hydrogen-oxygen torch is ignited, and the fluorine-doped base tube and the large and small The support tubes are fused and sintered together.

[0019] (2) Gradually increase the temperature while feeding O 2 and SF 6 The gas enters the reaction tube, and the fluorine-doped substrate tube is subjected to high-temperature polishing five times, the lathe speed is 40rpm, the lamp spe...

Embodiment 2

[0031] Embodiment 2: refer to figure 1 , the preparation method of the present embodiment comprises the following steps:

[0032] (1) Treat the fluorine-doped substrate tube with a ΔN of 0.22 and an outer diameter of 20 mm and the large and small support tubes at both ends with acid water, clamp the fluorine-doped substrate tube on the rear chuck of the MCVD glass lathe, and place the large support tubes respectively The tube 1 and the small support tube 5 are clamped on the front chuck of the MCVD glass lathe, and 2000ml / min oxygen is introduced into the reaction tube as a protective gas, the hydrogen-oxygen torch is ignited, and the fluorine-doped base tube and the large and small support The tubes are fused and sintered together.

[0033] (2) Gradually increase the temperature while feeding O 2 and SF 6 The gas enters the reaction tube, and the fluorine-doped substrate tube is subjected to high-temperature polishing five times, the lathe speed is 35 rpm, the lamp speed i...

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Abstract

The invention discloses a preparation method of a fluorine-doped precast rod. The preparation method comprises the following steps: fixing a fluorine-doped tube on a glass lathe to perform tube connection, polishing and tube expansion; then depositing an isolation layer; assembling the fluorine-doped tube for growing the isolation layer with a core rod after rod connection; fixing an assembled part on the glass lathe, and performing tube shrinkage, bushing and annealing to obtain an optical fiber precast rod; and performing heat treatment on the optical fiber precast rod, then fixing the optical fiber precast rod on a grinding machine, and peeling off an outmost quartz base tube material. The optical fiber precast rod processed by adopting the method has the advantages of flexible design and simple preparation, the thickness of the isolation layer can be designed according to different fluorine doping concentrations, the inner diameter of the fluorine-doped tube can be designed according to the diameters of different core rods, and the ratio of a fluorine-doped layer to the core diameter can be freely adjusted.

Description

technical field [0001] The invention relates to an optical fiber preparation process, in particular to a preparation method of a fluorine-doped preform rod. Background technique [0002] Quartz core fluorine-doped cladding fiber is an important device for laser transmission, widely used in medical, aerospace, communication and nuclear industries and other fields. Its requirements are low loss at the operating wavelength and a large core diameter for coupling with laser light. Foreign countries use POD (Plasma External Deposition) technology to prepare this type of optical fiber. It has a microwave plasma generator, and its outlet head is close to a rotating quartz core rod. It must participate in chemical reactions and deposit and grow on the quartz core rod. SiCl on the surface 4 , O 2 Chemical materials such as and F are guided through the shower head to form a plasma, and finally SiO 2 +SiF 4 The form of deposition grows on the surface of the quartz core rod. During ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B37/012
Inventor 张佳琦高亚明庞璐梁小红潘蓉衣永青
Owner CHINA ELECTRONICS TECH GRP NO 46 RES INST
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