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A degassing device and method for an optical fiber preform

A technology of optical fiber preform and degassing device, which is applied in the field of optical fiber manufacturing, can solve the problems of not being suitable for large-scale production, and achieve the effects of promoting rod structure adjustment, saving equipment space, and reducing internal stress

Active Publication Date: 2018-08-07
YANGTZE OPTICAL FIBRE & CABLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the degassing effect is good, the size of the current preform has far exceeded the size of 10mm, which is not suitable for mass production

Method used

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  • A degassing device and method for an optical fiber preform
  • A degassing device and method for an optical fiber preform
  • A degassing device and method for an optical fiber preform

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]Example 1: Using a method similar to a common degassing furnace (comparative example), without using a vacuum pipeline, the pressure in the quartz chamber is 1 atm.

[0034] An optical fiber preform powder rod is produced by VAD technology, and a preform rod with an outer diameter of about 80mm is formed after sintering, and a quartz orifice plate with an aperture of 90mm is selected. A quartz glass sealing gasket with an outer diameter of 100mm is installed on the target rod. Slowly pass the preform through the quartz orifice plate, hang it on the quartz glass orifice plate through the bolt, close the sealing cover, set the heat preservation temperature to 900°C, and enter the heat preservation process. In order to reflect the influence of the holding time, set the holding time as 5h, 10h, 15h, 20h, 40h respectively. After degassing, the prefabricated rod mother rod is stretched into a core rod with an outer diameter of 40mm, and the number of bubbles is analyzed to te...

Embodiment 2

[0036] Embodiment 2: Use the vacuum degassing method proposed in the present invention, set the exhaust pressure, and open the PID loop adjustment.

[0037] Five prefabricated rod powder rods are produced by VAD process, and after sintering, a preformed rod with an outer diameter of about 80mm is formed, and a quartz glass orifice plate with an aperture of 90mm is selected. A quartz glass sealing gasket with an outer diameter of 100mm is installed on the target rod. After passing the preform through the orifice plate of quartz glass, hang it on the orifice plate of quartz glass through the bolt, close the sealing cover, set the cavity pressure to 100mbar, and start vacuuming. At the same time, a PID pressure feedback control loop is set on the exhaust pipe to control the exhaust pressure and ensure the pressure is stable. Set the temperature of the holding furnace to 900°C, and then enter the heat preservation process. Take out a preform rod when the holding time is 5h, 10h,...

Embodiment 3

[0039] Embodiment 3: 5 prefabricated powder rods were produced by VAD technology, and after sintering, a preform with an outer diameter of about 120 mm was formed, and a quartz orifice plate with an aperture of 130 mm was selected. A quartz sealing ring with an outer diameter of 140mm is installed on the target rod. After the preform passes through the quartz glass orifice plate, it is suspended on the quartz glass orifice plate through a bolt. Ensure that the holding time is 10h, the annealing temperature is 900°C, adjust the pressure of the exhaust pipe to 10mbar, 30mbar, 60mbar, 150mbar, and 300mbar respectively, and open the PID pressure feedback control loop of the discharge pipe to adjust the pressure to keep the pressure stable.

[0040] After the preform rods undergoing different degassing conditions are stretched into 40mm outer diameter mandrels, they are placed on the detection platform to detect the number of bubbles and give feedback on the degassing effect. from...

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Abstract

The invention relates to a degassing device and method for an optical fiber preform. The device includes a holding furnace and a vacuum device connected to the holding furnace. The holding furnace includes a cylindrical quartz glass cavity and is installed outside the quartz glass cavity. The surrounding heating furnace, the quartz glass cavity is a closed cavity with an open top, and a quartz glass orifice plate is arranged on the top, and a sealing top cover is installed above the quartz glass orifice plate, and the sealing top cover and the quartz glass The glass cavities are arranged in phase to form the same airtight cavity. The invention adopts the treatment method of high temperature and negative pressure, which can quickly escape the gas such as He remaining in the optical fiber preformed rod, effectively remove the air bubbles in the optical fiber preformed rod, and improve the processing quality of the optical fiber preformed rod. The degassing device of the present invention is simple in structure, easy to use, and evenly heated, and can degas multiple optical fiber preforms at one time, effectively improving equipment productivity and reducing energy consumption; it can also effectively reduce the internal stress of quartz glass preforms .

Description

technical field [0001] The invention relates to a degassing device and method for an optical fiber preform rod, belonging to the technical field of optical fiber manufacturing. Background technique [0002] Currently known manufacturing processes for optical fiber preforms typically include in-tube vapor deposition processes, such as MCVD (modified chemical vapor deposition) improved chemical vapor deposition process and PCVD (plasmachemical vapor deposition) plasma excited chemical vapor deposition method; Vapor deposition process, such as OVD (outside vapor deposition) external vapor deposition process and VAD (vapor axial deposition) external axial deposition process. [0003] Compared with the vapor deposition process of the in-tube method, the out-of-tube deposition method such as the VAD process uses flame hydrogenation reaction to produce SiO2 and GeO2 powders, which are deposited on predetermined target rods to obtain optical fiber preform powder rods with uniform ou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B37/018
CPCY02P40/57
Inventor 黄利伟简宝寅张宏胜王瑞春顾立新渠驰张文俊杨轶高则尚朱方龙
Owner YANGTZE OPTICAL FIBRE & CABLE CO LTD
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