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Drawing method of multi-core laser fiber and drawing system used in drawing method

A technology of multi-core optical fiber and manufacturing method, applied in the field of optical fiber, can solve the problems of low precision and inability to precisely control the diameter of the air hole and the core diameter of the optical fiber, achieve a wide range of refractive index, increase active output power, and reduce impurities and air flow

Inactive Publication Date: 2012-06-27
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this method, glass materials that can be corroded by acid are inserted into the glass rods that constitute the preform, and then the preforms are arranged according to the design requirements and melted to shape, and the unnecessary parts are corroded by acid to form air holes to make multi-core optical fibers. The precision is not high, and the diameter of the fiber air hole and the fiber core diameter cannot be precisely controlled

Method used

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  • Drawing method of multi-core laser fiber and drawing system used in drawing method
  • Drawing method of multi-core laser fiber and drawing system used in drawing method
  • Drawing method of multi-core laser fiber and drawing system used in drawing method

Examples

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Effect test

Embodiment 1

[0047] Preparation of thin multi-core optical fiber rods

[0048] The quartz raw material 1 used in this example is pure quartz raw material; the heating chamber 2 is made of sapphire.

[0049] In this example, using figure 1 The structure diagram of the vacuum extrusion device shown in the preparation of laser fiber thin rods, according to figure 1 Structurally connect all parts; put the pure quartz raw material 1 in the funnel-shaped sapphire heating chamber 2, and heat it with a hydrogen-oxygen flame 16 at a heating temperature of 2500°C. After the quartz raw material melts, apply a The 20 Newton pressure makes the fused silica raw material extrude from the vacuum extrusion port 5 at the bottom of the sapphire heating chamber 2 to form a thin optical fiber rod. In this example, the diameter of the vacuum extrusion port 5 is set to a circle of 0.5mm, therefore, when the fused silica raw material is extruded, the optical fiber thin rod of pure silica raw material with a cyl...

Embodiment 2

[0051] Preparation of thin multi-core optical fiber rods

[0052] The quartz raw material 1 used in this example is a quartz raw material doped with rare earth neodymium ions, and its neodymium ion concentration is 1000 ppm.

[0053] Other preparation steps and process conditions are the same as in Example 1, and a thin optical fiber rod with neodymium ion gain as doping ions is obtained.

Embodiment 3

[0055] Preparation of multi-core optical fiber preform

[0056] Arranging and stacking the thin optical fiber rods prepared in Examples 1 and 2 into multi-core optical fiber preforms is to cut the thin optical fiber rods into about 160 thin rods with the same length, and then cut the pure silica optical fibers with air holes 10 Thin rods 8 and Nd-doped soil ion optical fiber rods 9 with air holes 10 are arranged and stacked according to the designed hexagonal structure; in the middle of the hexagon is a solid pure silica optical fiber rod 8, and Nd-doped fiber rods are arranged and stacked around it. Ionic thin optical fiber rods 9, and then gradually arrange and pile up pure quartz fiber core preform rods 8 toward the outer layer; after the arrangement and stacking is completed, insert an inner diameter that can accommodate the stacked fiber core preform rods and be a quartz sleeve 7 with an inner diameter of 10mm Inside, a multi-core optical fiber preform 15 is formed, the c...

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Abstract

The invention relates to a drawing method of a multi-core laser fiber and a drawing system used in the drawing method and belongs to the technical field of fibers. The drawing method comprising the steps as follows: quartz raw material, rare-earth-doped ion quartz material, or transition-metal-doped ion quartz material is prepared into a multi-core laser fiber thin rod by adopting a vacuum extrusion device; the multi-core laser fiber thin rod is cut into a plurality of laser fiber thin rods with the same length; the laser fiber thin rods are arranged and stacked according a designed geometric figure and sleeved in a quartz sleeve to form a multi-core laser fiber perform; and then the multi-core laser fiber perform is drawn through the drawing system to form the multi-core laser fiber. Relative to the capillary combined three-stage drawing method, the sol-gel method and the etching method in the prior, the whole drawing process of the multi-core laser fiber has the effects that the manufacturing process is simple and quick, the manufacturing cost is low, the possibility of defects introduced in a repeated heat treatment process is reduced, and the drawn multi-core laser fiber has good quality and high accuracy.

Description

technical field [0001] The invention relates to an optical fiber manufacturing technology, in particular to a drawing method and a drawing system of a large-mode-field multi-core laser optical fiber containing a laser gain medium, and belongs to the field of optical fiber technology. Background technique [0002] The idea of ​​applying fiber structure to lasers and laser amplifiers was proposed and verified by Snitzer in 1961. He used a Nd-doped fiber with a core of 300 μm as the laser gain medium. However, the development and application of low-loss optical fiber manufacturing technology and semiconductor lasers have brought new prospects for fiber lasers. Fiber lasers and fiber laser amplifiers with doped fibers as the core have the following advantages: high stability, low environmental requirements; fast heat dissipation, low loss, high efficiency; multiple output wavelengths, tunable; fiber export, and convenient system design Simple and other advantages. [0003] Aft...

Claims

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Application Information

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IPC IPC(8): C03B37/025
Inventor 冯国英周昊周寿桓
Owner SICHUAN UNIV