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Device and method for reducing impurity and bubble on core cladding interface for large-size optical fiber perform

An optical fiber preform and large-size technology, which is applied in the direction of manufacturing tools and glass manufacturing equipment, etc., can solve the problems of unintroduced core rod storage device and storage method, impurities and bubbles at the core-clad interface, which cannot be removed, and achieve improvement Product quality, reducing the number of impurities and air bubbles, reducing the effect of fiber breakage

Inactive Publication Date: 2015-04-29
ZHONGTIAN TECH ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] This method does not introduce the storage device and storage method of the mandrel. If dust and impurities have adhered to the surface of the mandrel before external vapor deposition, this process cannot remove them. impurities, bubbles
[0011] In the existing large-size optical fiber preform OVD manufacturing technology, due to equipment and process reasons, it is very easy to generate air bubbles and impurities at the core-clad interface of the preform, and gas lines or fiber breakage may occur during drawing of this type of preform. loss to the business

Method used

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  • Device and method for reducing impurity and bubble on core cladding interface for large-size optical fiber perform

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The core rod is prepared by the VAD process. After the core rod is extended, its refractive index profile is measured, and the required amount of the outer cladding is calculated from the test results.

[0055] The mandrel after the test is docked with the handle bar at both ends. After the mandrel is connected, put the mandrel into the special box for mandrel storage, place the mandrel on the clamping chuck of the mandrel support table, and close the door of the special box for storage. . The purified air is fed from the top of the special box for mandrel storage through the purified air fan, and the static-removing air is fed from the top of the special box for mandrel storage through the anti-static air fan.

[0056] After the mandrel is placed in the special box for storage for 1 hour, it is taken out and installed in the OVD equipment for production. The OVD equipment chuck rotates at 20rpm, and the quartz torch starts to deposit SiO? powder on the surface of the ...

Embodiment 2

[0060] After docking the rod, put the mandrel into the special box for mandrel storage. In the storage box, purified air is sent from the top of the special box for storage through the purified air fan. There is no static-eliminating air fan.

[0061] The transparent glass rod at the end of production is observed under the spotlight in the dark room, and there are 2 impurities and 3 air bubbles at the interface of the core package.

[0062] The test preform was drawn, and the screen breaking rate was 6.8‰, and the drawing qualification rate was 98.9%.

Embodiment 3

[0064] After docking, put the rod and the mandrel into a clean bag made of polyethylene, and take it out after 1 hour and use it directly for production. Others use the same process as in Example 1.

[0065] The transparent glass rod at the end of production is observed under the spotlight in the dark room, and there are 8 impurities and 5 air bubbles at the interface of the core package.

[0066] The test preform was drawn, and the screen breaking rate was 20.8‰, and the drawing pass rate was 97.2%.

[0067] Through the test comparison, the number of impurities and air bubbles at the interface of the core package of the preform is greatly reduced after the special storage box containing the purification air supply device and the static elimination air supply device is used; the wire drawing verification of the test preform is carried out, and the screen fiber breakage rate is obviously reduced. , the wire drawing pass rate is significantly increased, and the effect is remark...

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Abstract

The invention discloses a device and method for reducing impurities and bubbles on a core cladding interface for a large-size optical fiber perform, relate to the device and method for reducing the impurities and the bubbles on the core cladding interface in the manufacturing process of the large-size optical fiber perform, and aim to remove the impurities, dust and static on the surface of a core rod, and prevent a powder rod formed after the outside vapor deposition of the core rod from having bubbles and impurities on the core cladding interface. The device comprises a box special for holding the core rod, an air purifying fan and an anti-static fan, wherein the box special for holding the core rod comprises a box body; a box door is arranged on the front side of the box body; the air purifying fan and the anti-static fan are mounted at the top of the box body; a purifying air inlet and an anti-static air inlet are formed above the boxy body; the air outlet of the anti-static fan is connected with the anti-static air inlet on the box body through a pipe; a core rod support table is mounted at the bottom of the box body of the box special for holding the core rod and is used for supporting the core rod; a support chuck is mounted on each of the two sides on the lower part of the box body and used for clamping and fixing the core rod.

Description

technical field [0001] The device and method for reducing impurities and air bubbles at the core-clad interface of a large-size optical fiber preform of the present invention relate to a device and method for reducing the adhesion of impurities and bubbles at the core-clad interface during the manufacturing process of a large-size optical fiber preform. Eliminate impurities, dust and static electricity on the surface of the mandrel; at the same time, by removing static electricity, it can effectively prevent the second adsorption of impurities and dust on the mandrel, and prevent the powder rod formed after vapor deposition on the outside of the mandrel. Impurities. Background technique [0002] In order to reduce the cost of optical fiber production and improve deposition efficiency, large-size optical fiber preforms have become the main direction of preform technology development. [0003] There are four main methods of producing silica optical fiber prefabricated core ro...

Claims

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Application Information

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IPC IPC(8): C03B37/018
Inventor 张彬沈一春陈京京
Owner ZHONGTIAN TECH ADVANCED MATERIALS CO LTD
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