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Manufacturing method of large-size optical fiber preform

A technology of optical fiber preform and manufacturing method, which is applied in the direction of manufacturing tools and glass manufacturing equipment, etc., which can solve the problems of large equipment load and increase of sintering furnace, and achieve the effects of small equipment load, low manufacturing cost, saving production capacity and cost

Pending Publication Date: 2021-11-09
杭州金星通光纤科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When producing large-sized optical fiber preforms, vacuum sintering is directly carried out, and the size of the sintering furnace needs to be increased accordingly, and the negative pressure maintenance and heat supply in the furnace will generate a large load on the equipment

Method used

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  • Manufacturing method of large-size optical fiber preform

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Using a core rod with a core-to-package ratio of 3.6 as the target rod, deposit a porous optical fiber preform with a density of 0.42g / cm 3 , The average outer diameter is 345mm.

[0025] Put it into a quartz furnace, feed 0.7L / min of chlorine gas and 10L / min of helium gas, set the furnace temperature at 1250°C, and dry for 3 hours. After the end, the average outer diameter of the porous optical fiber preform is 246.9mm, and the density is 0.82g / cm 3 .

[0026] Finally, put it into a vacuum sintering furnace for sintering to form a transparent and bubble-free optical fiber preform with an average outer diameter of 172.6mm.

[0027] After being drawn into an optical fiber, no gas lines were found in the bare optical fiber, and the average 1383 attenuation of the optical fiber was 0.283dB / km.

Embodiment 2

[0029] Using a core rod with a core-to-cover ratio of 4.2 as the target rod, deposit a porous optical fiber preform with a density of 0.39g / cm 3 , The average outer diameter is 356mm.

[0030] Put it into a quartz furnace, feed 0.8L / min of chlorine gas and 10L / min of nitrogen gas, set the furnace temperature at 1230°C, and dry for 3 hours. After the end, the average outer diameter of the porous optical fiber preform is 255.3mm, and the density is 0.76g / cm 3 .

[0031] Finally, put it into a vacuum sintering furnace for sintering to form a transparent and bubble-free optical fiber preform with an average outer diameter of 175.4mm.

[0032] After being drawn into an optical fiber, the length of the gas-containing line of the bare optical fiber is 5km, and the average 1383 attenuation of the optical fiber is 0.271dB / km.

Embodiment 3

[0034] Using a core rod with a core-to-cover ratio of 3.8 as the target rod, deposit a porous optical fiber preform with a density of 0.45g / cm 3 , The average outer diameter is 351mm.

[0035] Put it into a quartz furnace, feed 0.6L / min of chlorine gas and 8L / min of helium gas, set the furnace temperature at 1270°C, and dry for 3 hours. After the end, the average outer diameter of the porous optical fiber preform is 255.6mm, and the density is 0.85g / cm 3 .

[0036] Finally, put it into a vacuum sintering furnace for sintering to form a transparent and bubble-free optical fiber preform with an average outer diameter of 182.1mm.

[0037] After being drawn into an optical fiber, no gas lines were found in the bare optical fiber, and the average 1383 attenuation of the optical fiber was 0.276dB / km.

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Abstract

The invention discloses a manufacturing method of a large-size optical fiber preform. The manufacturing method comprises the following steps: depositing by using a core rod with a small core-to-package ratio as a target rod, drying in a quartz furnace to increase the density of the porous optical fiber preform, introducing a small amount of chlorine gas and inert gas in the drying process, controlling the flow rate of the chlorine gas to be 0.3-0.8 L / min and the flow rate of the inert gas to be 5-10 L / min, and finally, putting into a vacuum sintering furnace, and sintering and densifying to form the final large-size optical fiber preform. According to the invention, the load of the vacuum sintering furnace can be reduced, the bubble-free, large-size and low-hydroxyl optical fiber preform can be manufactured, the overall manufacturing cost is low, and the method is suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of optical fiber preform manufacturing, in particular to a method for manufacturing a large-size optical fiber preform. Background technique [0002] At present, the conventional densification method of porous optical fiber preform is to use a quartz sintering furnace to dry and dehydrate first, and then sinter vitrification, and to pass a specific ratio of helium and chlorine gas during the drying and sintering process. [0003] As the price of helium has increased sharply in recent years, the cost of optical fiber preforms has also increased accordingly. As the size requirements of optical fiber preforms continue to increase, sintering in traditional quartz sintering furnaces will lead to a reduction in the quality of large-size optical fiber preforms and defects such as bubbles. [0004] Therefore, vacuum sintering furnaces have been developed at home and abroad, which use negative pressure to sinter por...

Claims

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Application Information

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IPC IPC(8): C03B37/014
CPCC03B37/01466C03B37/01446C03B37/014
Inventor 刘世浩郑伟章海峰张学军吴志元郑宇
Owner 杭州金星通光纤科技有限公司
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