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Heterogeneous glass material optical fiber prefabricated rod preparation and wiredrawing method

An optical fiber preform, glass material technology, applied in glass manufacturing equipment, manufacturing tools, etc., can solve the problems of extrusion to the top, incomplete fiber core, rapid melting, etc., to achieve the effect of controlling the diameter ratio and good bonding condition

Active Publication Date: 2020-04-10
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the softening point of the mandrel material is lower than that of quartz glass, and under the influence of negative pressure inside the tube, it is easy for the mandrel material to be squeezed to the top by the shrunk quartz glass cladding tube, resulting in a very thin or no core; or, The mandrel material melts rapidly, the unmelted mandrel part loses its support, and at the same time, the quartz glass cladding tube shrinks, forming a closed part of air between the mandrel and the quartz glass cladding tube, forming bubbles, which is manifested in the fiber core as not full or hollow
The pouring method requires more complex equipment

Method used

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  • Heterogeneous glass material optical fiber prefabricated rod preparation and wiredrawing method
  • Heterogeneous glass material optical fiber prefabricated rod preparation and wiredrawing method
  • Heterogeneous glass material optical fiber prefabricated rod preparation and wiredrawing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Use SG Controls fiber drawing tower, graphite heating furnace.

[0037] Such as figure 1 , 2 As shown, a preparation process and drawing process of a heterogeneous glass material tube rod preform, using the drawing tower heating furnace and drawing tower rod feeding system produced by SGControls company to control the heating and moving program of the core rod, prepare the optical fiber preform, and Use the drawing tower to complete the drawing process. The concrete steps of described method are:

[0038] S1, the preparation component is 96SiO 2 -1Al 2 o 3 -3B 2 o 3 -0.01Er 3+ Glass, whose refractive index is 1.458, and softening point (i.e. softening temperature) is 1500 ℃, obtains the mandrel that surface roughness is 2, diameter is 3mm, length is 40mm by cutting and polishing;

[0039] S2. Prepare a quartz glass tube with an outer diameter of 30mm, an inner diameter of 3.5mm, a length of 200mm, and a purity of 99.999%;

[0040] S3. Connect the quartz glass ...

Embodiment 2

[0046] Such as figure 1 , 2 As shown, a preparation process and drawing process of a heterogeneous glass material tube rod preform, using the drawing tower heating furnace and drawing tower rod feeding system produced by SGControls company to control the heating and moving program of the core rod, prepare the optical fiber preform, and Use the drawing tower to complete the drawing process. The concrete steps of described method are:

[0047] S1, the preparation component is 33BaO-31TiO 2 -10SiO 2 -26Al 2 o 3 -0.01Er 3+ Glass with a refractive index of 1.55 and a melting temperature lower than 1550°C, pressed through a mold to form a silicate glass core rod with a diameter of 2.5 mm and a length of 30 mm;

[0048] S2. Prepare a quartz glass tube with an outer diameter of 30mm, an inner diameter of 3mm, a length of 200mm, and a purity of 99.999%;

[0049] S3. Connect the quartz glass cladding tube and the tail tube with a connecting rod, and melt and seal the turned-off ...

Embodiment 3

[0054] Use the special fiber drawing tower and graphite heating furnace produced by Shanghai Yupin Communication Technology Co., Ltd.

[0055] S1. Prepare the mandrel material as a monocrystalline silicon rod with a diameter of 2.5mm and a length of 50mm, with a melting point of 1410°C and a surface finish meeting the requirements of Class 2;

[0056] S2. Prepare a quartz glass tube with an outer diameter of 20mm, an inner diameter of 3mm, a length of 200mm, and a purity of 99.999%;

[0057] S3. Connect the quartz glass cladding tube and the tail tube with a connecting rod, and melt and seal the turned-off end of the quartz glass cladding tube and draw it into a tapered shape;

[0058] S4, putting the mandrel into the quartz glass cladding tube;

[0059] S5. Fix the tail tube to the chuck of the optical fiber drawing tower, drive the core rod and the quartz glass cladding tube to the hot zone of the heating furnace through the rod feeding system, and control the air pressure ...

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Abstract

The invention belongs to the technical field of optical fiber prefabricated rod preparation, and discloses a heterogeneous glass material optical fiber prefabricated rod preparation and wiredrawing method. For preparation of a prefabricated rod with quartz glass as a cladding layer and other glass materials as a core rod, a wiredrawing tower heating furnace and a rod feeding servo system are usedfor completing prefabricated rod preparation, and then a wiredrawing process is completed. The preparation process of the prefabricated rod comprises the steps: selecting a proper core rod and a proper cladding material, and adjusting heating and rod feeding procedures by using the wire drawing tower heating furnace and the rod feeding servo system, so as to attach the core rod and a quartz glasscladding tube together. In the step of wiredrawing, after the prefabricated rod is prepared, the optical fiber wiredrawing tower is used for the wiredrawing process. A wiredrawing tower device is fully utilized, the heating process of the core rod and the quartz glass cladding tube is controlled in a programmed mode, under the condition that the surface of the core rod is rough, the good attachment condition of the core rod and the inner surface of the quartz glass cladding tube is achieved, and the core / cladding diameter ratio of the optical fiber is effectively controlled.

Description

technical field [0001] The invention belongs to the technical field of optical fiber preform preparation, and more specifically relates to a method for preparing and drawing an optical fiber preform made of heterogeneous glass material. Background technique [0002] The industrial production process of optical fiber preforms has relatively high requirements on processing equipment, working environment, process procedures, supporting testing and other conditions, which restricts the research work of some special optical fibers, especially limits the doping concentration of rare earth elements in active optical fibers . [0003] In the field of active optical fiber preparation, in order to solve the defect of low solubility of rare earth ions in the quartz matrix, it is proposed to use quartz tube as the fiber cladding, and other matrix glasses as rare earth doped core rods, such as: silicate glass, fluoride glass, tellurate Glass, germanate glass, phosphate glass and yttrium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B37/012C03B37/027
CPCC03B37/01211C03B37/01225C03B37/01257C03B37/027
Inventor 戴能利陈阳胡雄伟刘孝芬刘永光
Owner HUAZHONG UNIV OF SCI & TECH