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A large-size low-loss optical fiber preform and its manufacturing method

A technology of optical fiber preform and manufacturing method, which is applied in the field of large-size and low-loss optical fiber preform and its manufacturing, and can solve the problems of inability to manufacture optical fiber preform and inability to manufacture large-size and low-loss optical fiber preform, etc.

Active Publication Date: 2021-09-10
TONGDING INTERCONNECTION INFORMATION CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: in order to solve the technical problem that the existing technology cannot manufacture a large-size low-loss optical fiber preform, especially the large-size low-loss optical fiber preform with a continuous melting sleeve as the outer cladding, a A large-size low-loss optical fiber preform with continuous melting sleeve as outer cladding and its manufacturing method

Method used

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  • A large-size low-loss optical fiber preform and its manufacturing method
  • A large-size low-loss optical fiber preform and its manufacturing method
  • A large-size low-loss optical fiber preform and its manufacturing method

Examples

Experimental program
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Effect test

Embodiment 1

[0048] The powder mandrel is prepared by the axial vapor deposition method (VAD method), and then the prepared powder mandrel is dehydroxylated, fluorine doped and vitrified in a graphite sintering furnace, and Cl is introduced into the sintering furnace during dehydration. 2 gas and He gas, Cl 2 The gas flow rate is 1000mL / min, the He gas flow rate is 20L / min, and the dehydration temperature is 1050°C. During dehydration, the powder mandrel moves from top to bottom at a moving speed of 8mm / min; after dehydration, the powder mandrel rises to the upper part of the sintering furnace , into SiF 4 gas and He gas, SiF 4 The flow ratio of gas and He gas is 4:1, in which the flow rate of He gas is 30L / min, the temperature of sintering furnace is 1400℃ when doped with fluorine, and the powder mandrel moves from top to bottom at a speed of 10mm / min; finally the powder mandrel Move from top to bottom for vitrification treatment, the moving speed is 4mm / min, only He gas is fed into the...

Embodiment 2

[0056] The powder mandrel is prepared by the axial vapor deposition method (VAD method), and then the prepared powder mandrel is dehydroxylated, fluorine doped and vitrified in a graphite sintering furnace, and Cl is introduced into the sintering furnace during dehydration. 2 gas and He gas, Cl 2 The gas flow rate is 900mL / min, the He gas flow rate is 25L / min, and the dehydration temperature is 900°C. During dehydration, the powder mandrel moves from top to bottom at a moving speed of 7mm / min; after dehydroxylation, the powder mandrel rises to the upper part of the sintering furnace , into CF 4 gas and He gas, CF 4 The flow ratio of gas and He gas is 3:1, the flow rate of He gas is 40L / min, the temperature of the sintering furnace is 1100℃ when doped with fluorine, and the powder mandrel moves from top to bottom at a speed of 8mm / min; finally the powder mandrel Move from top to bottom for vitrification treatment, the moving speed is 3mm / min, only He gas is passed into the si...

Embodiment 3

[0064] The powder mandrel is prepared by the axial vapor deposition method (VAD method), and then the prepared powder mandrel is dehydroxylated, fluorine doped and vitrified in a graphite sintering furnace, and Cl is introduced into the sintering furnace during dehydration. 2 gas and He gas, Cl 2 The gas flow rate is 1100mL / min, the He gas flow rate is 15L / min, the dehydration temperature is 1100°C, the powder mandrel moves from top to bottom during dehydration, and the moving speed is 10mm / min; after the dehydration is completed, the powder mandrel rises to the upper part of the sintering furnace , into SF 6 Gas and He gas, SF 6The flow ratio of gas and He gas is 5:1, the flow rate of He gas is 20L / min, the temperature of sintering furnace is 1500℃ when doped with fluorine, and the powder mandrel moves from top to bottom at a speed of 9mm / min; finally the powder mandrel Move from top to bottom for vitrification treatment, the moving speed is 6mm / min, only He gas is fed into...

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Abstract

The invention relates to a large-size low-loss optical fiber preform and a manufacturing method thereof. The manufacturing method is as follows: using a VAD process to prepare an optical fiber core rod, and the inside to the outside of the optical fiber core rod is a core layer and an inner cladding; Deposit the loose body of the barrier layer on the outside of the rod, and then perform sintering treatment to obtain the synthetic core rod; use the RIC process to combine the synthetic core rod and the continuous melting sleeve to form a large-size low-loss optical fiber preform. The diameter of the optical fiber preform prepared by the present invention can reach 205mm, and the fiber drawing length of a single preform can reach 3200km. The attenuation coefficient at ≤0.174dB / km, the mode field diameter at 1310nm wavelength is 8.9-9.3μm, and the cut-off wavelength of the optical fiber is ≤1270nm.

Description

technical field [0001] The invention relates to a large-size and low-loss optical fiber preform and a manufacturing method thereof, belonging to the field of optical fiber preform manufacture. Background technique [0002] With the development of the economy, the optical fiber industry has entered a new round of high-speed development period, and the optical communication industry has shown a booming situation. Under such a good situation, realizing the localization and scale of large-size low-attenuation optical fiber preform as soon as possible is not only the need for the development of China's optical fiber industry, but also the only way for domestic optical fiber enterprises to survive. [0003] At present, the process of producing optical fiber preforms mainly adopts a two-step method, that is, the core rod of the prefabricated rod is manufactured first, and then the cladding is manufactured outside the core rod. Mandrel manufacturing technology mainly has the follow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B37/018C03B37/014C03B37/025
CPCC03B37/014C03B37/018C03B37/025
Inventor 沈小平梁伟蒋锡华何炳刘建中崔德运贺程程王兵钦张红
Owner TONGDING INTERCONNECTION INFORMATION CO LTD
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