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A rare earth-doped optical fiber preform and its preparation method

An optical fiber preform and rare earth doping technology, which is applied in glass manufacturing equipment, glass fiber products, manufacturing tools, etc., can solve problems such as large differences in optical fiber parameters, and achieve the effects of ensuring concentricity, easy drawing, and easy control

Active Publication Date: 2020-06-02
YANGTZE OPTICAL FIBRE & CABLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By adding a layer of low-refraction quartz cladding with a circular cross-sectional shape to the irregular quartz cladding, the problem of large differences in fiber parameters caused by non-circular preform wire diameter and tension fluctuations is solved, and the pumping light is reduced. Leakage, extended fiber life

Method used

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  • A rare earth-doped optical fiber preform and its preparation method
  • A rare earth-doped optical fiber preform and its preparation method
  • A rare earth-doped optical fiber preform and its preparation method

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preparation example Construction

[0039] The preparation method of the rare earth-doped optical fiber preform provided by the present invention comprises the following steps:

[0040] (1) Wrap the doped core layer with the first quartz cladding material and stretch it until the cross-sectional area ratio matches the cross-sectional area ratio of the second quartz cladding layer, and process its cross section into a predetermined shape to obtain a semi-finished preform;

[0041] (2) Wrap the semi-finished preform obtained in step (1) with a second quartz cladding material, and process its cross section into a circle to obtain the doped optical fiber preform.

[0042] It is preferred to adopt the shrinkage burning method, specifically:

[0043] (1) Stretching the doped mandrel and the first quartz-clad sleeve RIT until the cross-sectional area ratio matches the second quartz-clad cross-sectional area ratio, and processing the cross-section into a predetermined shape to obtain a semi-finished preform;

[0044] (2)...

Embodiment 1

[0048] 20 / 350 / 400 type ytterbium-doped triple-clad optical fiber preform and its preparation method

[0049] A rare earth-doped optical fiber preform, including a doped core layer, a first silica cladding, and a second silica cladding from inside to outside;

[0050] The numerical aperture of the doped core layer relative to the first quartz cladding layer is 0.06, and the radius of the doped core layer is 3.00 mm. The core doping composition is 1.0%wt Yb 2 o 3 , 3.5% wt P 2 o 5 , 3.0% wt Al 2 o 3 , 92.5% wt SiO 2 .

[0051] The first quartz cladding is a pure quartz cladding; the cross-sectional shape is a regular octagon. The diameter ratio of the first quartz cladding layer and doped core layer (such as Figure 4 a 2 :a 1 ) is 17.5:1 (the cross-sectional area ratio of the first quartz cladding layer and the doped core layer is 322:1).

[0052] The numerical aperture of described second quartz cladding relative to the first quartz cladding is 0.22, and its diamet...

Embodiment 2

[0062] A kind of ytterbium-doped triple-clad optical fiber preform and its preparation method

[0063] A rare earth-doped optical fiber preform, including a doped core layer, a first silica cladding, and a second silica cladding from inside to outside;

[0064] The numerical aperture of the doped core layer relative to the first quartz cladding layer is 0.2, and the radius of the doped core layer is 6.00 mm. The core doping composition is 1.0%wt Yb 2 o 3 , 3.5% wt P 2 o 5 , 6.2% wt Al 2 o 3 .

[0065] The first quartz cladding is a pure quartz cladding; the cross-sectional shape is a regular hexagon with a radius of 7.8 mm, and the radius of the first quartz cladding refers to half the distance between two parallel opposite sides of the hexagon.

[0066] The numerical aperture of the second quartz cladding relative to the first quartz cladding is 0.12; the second quartz cladding is a fluorine-doped quartz layer, and the mass percentage of fluorine doping is 1.18%. The ...

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Abstract

The invention discloses a doped optical fiber preformed rod and a preparation method thereof. The preformed rod comprises a doped core layer, a first quartz cladding layer and a second quartz cladding layer from inside to out; the numerical aperture of the second quartz cladding layer relative to the first quartz cladding layer ranges from 0.1 to 0.24; the section of the second quartz cladding layer is round. The doped optical fiber preformed rod is prepared according to the following method: (1) wrapping the doped core layer with the first quartz cladding layer material, stretching until the section area ratio is matched with the section area ratio of the second quartz cladding layer, and processing the section into predetermined appearance to obtain a preformed rod semi-finished product; (2) wrapping the preformed rod semi-finished product with the second quartz cladding layer material and processing the section into round to obtain the doped optical fiber preformed rod. The optical fiber preformed rod provided by the invention facilitates wire-drawing forming and pump light leakage is greatly reduced; according to the preparation method, the geometric concentricity of the preformed rod can be guaranteed and the consistency of the optical fiber production batches is improved.

Description

technical field [0001] The invention belongs to the field of optical fiber laser technology, and more specifically relates to a rare earth-doped optical fiber prefabricated rod for lasers and a preparation method thereof. Background technique [0002] Fiber laser is a kind of laser that uses optical fiber as laser gain medium. By doping different rare earth ions in the fiber quartz matrix, laser output in different bands can be obtained. Due to the advantages of high beam quality, large specific surface area, good heat dissipation, high conversion efficiency, small size, compact structure, and easy maintenance, fiber lasers are widely used in many fields such as industrial processing, medical treatment, military affairs, and communications. [0003] The single-clad rare-earth-doped fiber was used in the early stage, and the pump light was required to be injected directly into the fiber core. When the pump power gradually increased, it was difficult to further improve the pum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B37/012
CPCC03B37/01211C03B2201/07C03B2201/12C03B2201/28C03B2201/32C03B2201/34C03B2203/12
Inventor 黄宏琪孙程杨玉诚岳天勇徐峰周游李郴曹蓓蓓
Owner YANGTZE OPTICAL FIBRE & CABLE CO LTD
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