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A kind of manufacturing method of optical fiber preform based on sleeve method

A technology of optical fiber preform and manufacturing method, which is applied in the direction of manufacturing tools and glass manufacturing equipment, etc., can solve the problems such as difficulty in guaranteeing the bow curvature and diameter uniformity of mandrels, achieve optimal viscosity matching, reduce concentricity errors, and reduce manufacturing cost effect

Active Publication Date: 2020-10-30
JIANGSU ETERN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for manufacturing an optical fiber preform based on the casing method in order to solve the technical problem that it is difficult to guarantee the bow and diameter uniformity of the optical fiber preform prepared by the casing method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment provides a method for manufacturing an optical fiber preform based on the casing method, and the steps are as follows:

[0029] The optical fiber core rod mother rod is prepared by VAD technology, and the optical fiber core rod master rod is composed of a core layer and an inner cladding layer from the inside to the outside, and the core layer is doped with P 2 o 5 The silica glass layer, the relative refractive index Δn of the core layer 1 is 0.35%, the inner cladding is a fluorine-doped silica glass layer, and the relative refractive index Δn of the inner cladding is 2 -0.05%; the specific steps for preparing the optical fiber core rod master rod are: first deposit the powder core rod by axial vapor deposition method, and then carry out dehydration treatment, fluorine doping treatment and vitrification treatment on the powder core rod in the sintering furnace : During dehydration treatment, feed Cl into the sintering furnace 2 gas and helium, and th...

Embodiment 2

[0035] This embodiment provides a method for manufacturing an optical fiber preform based on the casing method, and the steps are as follows:

[0036] The optical fiber core rod mother rod is prepared by VAD technology, and the optical fiber core rod master rod is composed of a core layer and an inner cladding layer from the inside to the outside, and the core layer is doped with P 2 o 5 The silica glass layer, the relative refractive index Δn of the core layer 1 is 0.5%, the inner cladding is a fluorine-doped silica glass layer, and the relative refractive index Δn of the inner cladding is 2 -0.01%; the specific steps of preparing the optical fiber core rod master rod are: first deposit the powder core rod by axial vapor deposition method, and then carry out dehydration treatment, fluorine doping treatment and vitrification treatment on the powder core rod in the sintering furnace : During dehydration treatment, feed Cl into the sintering furnace 2 gas and helium, the dehy...

Embodiment 3

[0042] This embodiment provides a method for manufacturing an optical fiber preform based on the casing method, and the steps are as follows:

[0043] The optical fiber core rod mother rod is prepared by VAD technology, and the optical fiber core rod master rod is composed of a core layer and an inner cladding layer from the inside to the outside, and the core layer is doped with P 2 o 5 The silica glass layer, the relative refractive index Δn of the core layer 1 is 0.4%, the inner cladding is a fluorine-doped silica glass layer, and the relative refractive index Δn of the inner cladding is 2 -0.08%; the specific steps of preparing the optical fiber core rod master rod are: first deposit the powder core rod by the axial vapor deposition method, and then carry out dehydration treatment, fluorine doping treatment and vitrification treatment on the powder core rod in the sintering furnace : During dehydration treatment, feed Cl into the sintering furnace 2 gas and helium, and ...

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Abstract

Disclosed is a method for manufacturing an optical fiber preform based on a sleeve method, the method comprising the following steps: preparing an optical fiber mother core rod comprising a core layer and an inner cladding layer by using a VAD process, then heating and stretching the optical fiber mother core rod such that the curve degree of the stretched optical fiber core rod is less than 1 mm / m, then preparing a depressed layer by means of an OVD process, and finally, inserting the combined core rod into a quartz sleeve to form an optical fiber preform. The diameter of the prepared optical fiber preform may be up to 221 mm, the fiber pulling length of a single preform may be up to 2995 km, the attenuation coefficient of an optical fiber at a wavelength of 1310 nm is less than or equal to 0.305 dB / km, the attenuation coefficient of the optical fiber at a wavelength of 1383 nm is less than or equal to 0.275 dB / km, and the attenuation coefficient of the optical fiber at a wavelength of 1550 nm is less than or equal to 0.165 dB / km.

Description

technical field [0001] The invention relates to a method for manufacturing an optical fiber preform rod based on a casing method, and belongs to the field of optical fiber preform rod manufacturing. Background technique [0002] At present, there are four main methods for producing optical fiber preforms: Modified Chemical Vapor Deposition (MCVD), Microwave Plasma Chemical Vapor Deposition (PCVD), External Vapor Deposition (OVD) and Axial Vapor Deposition. (VAD), but there are the following problems in the manufacture of optical fiber preforms with large outer diameters only by the above method: the in-tube deposition method (MCVD and PCVD) is limited by the size of the liner, and cannot directly manufacture optical fiber preforms with large outer diameters, while the outside of the tube The deposition method (VAD and OVD) directly manufactures a mandrel with a large outer diameter, and the cost is relatively high, which cannot reflect the advantages of using the casing meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B37/012C03B37/014C03B37/025
CPCC03B37/012C03B37/014C03B37/025
Inventor 莫思铭李凡眭立洪张国栋周莉李想
Owner JIANGSU ETERN
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