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Large-mode active optical fiber and manufacture method thereof

A manufacturing method and large mode field technology, applied in cladding optical fiber, manufacturing tools, glass manufacturing equipment, etc., can solve problems such as poor beam quality, achieve the effects of improving reliability, reducing manufacturing costs, and improving beam quality

Active Publication Date: 2010-06-16
FENGHUO COMM SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] The technical problem to be solved by the present invention is to solve the problem of poor beam quality of the large mode field active optical fiber

Method used

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  • Large-mode active optical fiber and manufacture method thereof
  • Large-mode active optical fiber and manufacture method thereof
  • Large-mode active optical fiber and manufacture method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] This embodiment comprises the following steps:

[0046] A10. Use the PCVD plasma chemical vapor deposition process to prepare a fluorine-doped low-refractive index high-purity quartz glass sleeve. The relative refractive index difference of the sleeve material relative to pure quartz glass is -1.06%, that is, use the PCVD process in a hollow Depositing fluorine on the inner wall of the quartz glass substrate tube to obtain a quartz glass casing whose inner wall is a fluorine-doped layer;

[0047] A20, using PCVD plasma chemical vapor deposition process to deposit silicon tetrachloride and germanium tetrachloride on the inner wall of another hollow quartz glass substrate tube to make a preform for drawing the fiber core. In this step, the pressure inside the quartz glass substrate tube is 1000pa to 1200pa, the microwave power for heating the quartz glass substrate tube is 5.0kW to 7.0kW, and the deposition temperature is 1200°C to 1250°C. During the core deposition proce...

Embodiment 2

[0054] The difference between this embodiment and Embodiment 1 is that

[0055] In step A10, the relative refractive index difference of the casing material relative to pure quartz glass is -1.50%.

[0056] In step A20, ytterbium ion (Yb 3+ ) with a molar content of 0.12%, and the core refractive index profile distribution parameter α=2.03.

[0057] In step A30, when the diameter of the central hole of the quartz tube is reduced to 1.2mm, it is 100% C 2 f 6 gas, the corrosion time is 10 minutes. After etching, it is melted down into a solid quartz glass core rod. The core diameter of the quartz core rod is 3 mm, and the numerical aperture of the core is 0.05. The relative refractive index difference between the inner cladding of quartz glass and the fluorine-doped low-refractive index sleeve is 1.5%.

[0058] In step A60, the drawn large mode field active optical fiber has a core diameter of 110 μm, an inner cladding diameter of 350 μm, and an outer cladding diameter of ...

Embodiment 3

[0061] The difference between this embodiment and Embodiment 1 is that

[0062] In step A10, the relative refractive index difference of the casing material relative to pure quartz glass is -0.30%.

[0063] In step A20, A1=10.72, B1=0.15, C1=-11.68, α 1 =2.8, ytterbium ion (Yb 3 ) molar content is 0.15%, and the core refractive index profile distribution parameter α=2.86.

[0064] In step A30, when the diameter of the central hole of the quartz tube was reduced to 1.6mm, the concentration of 100% C 2 f 6 Gas, the etching time is 15 minutes, after the etching is completed, it is melted into a solid quartz glass core rod, the core diameter of the quartz core rod is 3.2mm, and the numerical aperture of the core is 0.06.

[0065] In step A40, the solid preform is ground into an inner cladding having a shape of a regular hexagonal prism;

[0066] In step A60, the drawn large mode field active optical fiber has a core diameter of 202 μm, an inner cladding diameter of 655 μm, an...

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Abstract

The invention relates to optical fiber and a manufacture method thereof, in particular to large-mode active optical fiber and a manufacture method thereof. The large-mode active optical fiber is formed by drawing a fiber core and a quartz glass inner cladding, a quartz glass outer cladding and a coating which are sequentially coated on the outer surface of the fiber core, wherein the fiber core is formed by depositing, melting and collapsing silicon tetrachloride doped with rare-earth ions in a quartz glass tube; the refractive index of the fiber core is a gradually changed refractive index, and a fiber core refractive index section parameter alpha is not smaller than 1 and not larger than 3; and the appearance of the quartz glass inner cladding is in a regular gengon shape. The large-mode active optical fiber has the advantages of large mode and similar single-mode output, improves the capacity of bearing laser power and the energy storage density of the active optical fiber, improves the light beam quality of output laser, solves the problem of hollow ring of the output laser, greatly improves the reliability of high-power optical fiber laser devices and the utilization rate of raw materials and reduces the manufacture cost.

Description

technical field [0001] The invention relates to an optical fiber and a manufacturing method thereof, in particular to a large mode field active optical fiber and a manufacturing method thereof. Background technique [0002] The technical terms involved in the present invention are explained as follows: [0003] Deposition: the process in which optical fiber raw materials undergo chemical reactions in a certain environment and generate doped quartz glass; [0004] Melting: the process of gradually firing the deposited hollow glass tube into a solid glass rod under a certain heat source; [0005] Sleeve: a high-purity quartz glass tube with a certain cross-sectional area and uniform size; [0006] Substrate tube: high-purity quartz glass tube for deposition; [0007] Refractive Index Profile (RIP): The relationship between the refractive index of an optical fiber or an optical fiber preform (including an optical fiber core rod) and its radius; [0008] Absolute refractive ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/028G02B1/00C03B37/018C03B37/02
CPCC03B2201/12C03B2203/12G02B6/0365C03B2201/34C03B37/018C03B37/01228C03B37/02754G02B6/0281G02B1/00C03B2201/31C03B37/02C03B37/0183G02B6/028Y02P40/57
Inventor 陈伟李诗愈雷道玉王冬香罗文勇黄文俊胡福明胡鹏
Owner FENGHUO COMM SCI & TECH CO LTD
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