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Sintering device of loose body optical fiber prefabricated rod

A technology of optical fiber preform and sintering device, which is applied in the direction of manufacturing tools, glass molding, glass manufacturing equipment, etc., can solve the problems of uneven length direction, failure of heating element, and misalignment, etc., so as to reduce the increase of loss and ensure Uniformity, concentricity improvement effect

Inactive Publication Date: 2005-03-23
JIANGSU FASTEN PHOTONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the thermal zone is not uniform, it is easy to cause the sintered part and the unsintered part to be out of concentricity, and cause the final fiber concentricity error
Moreover, due to the relatively low viscosity of the sintered part, the periphery of the non-concentric part will have a certain ellipticity error in the non-uniform thermal zone
In addition, due to the low viscosity, the sintered rod will shrink unevenly under the double action of gravity and glass surface tension, forming unevenness in the length direction
[0005] Therefore, if the design is unreasonable or the heating element fails during use, it will cause the concentricity, ellipticity error and inhomogeneity of the mode field diameter of the optical rod
After the optical fiber is drawn by the optical rod, due to the shape of the core, the gap between the center of the core and the cladding, and the diameter of the core, a large splice loss will be found during splicing.

Method used

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  • Sintering device of loose body optical fiber prefabricated rod

Examples

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Comparison scheme
Effect test

specific example 1

[0044]The soot preform 14 after external deposition is vertically suspended on the hanging rod 12 of the sintering tower, and the soot preform is slowly put into the sintering tube 18 through the lifting and translation of the servo motor 1; into the sintering tube, and placed on the sintering area of ​​the heating device, cover the upper part of the sintering tube with a cover 19 to form a relatively airtight sintering atmosphere; the control device 7 controls the heating element 15 through the electric heater driving part When the temperature rises to 1100°C, gas such as 0.35 splm chlorine and 35 slpm helium is introduced into the sintered tube from the gas supply part 11 for dehydration. The proportion of gas is controlled at 1%; the dehydration time is 1 hour, and after the end, the electric heater driving part 6 controls the heating element 15 to raise the furnace temperature to 1500 °C; the control device 7 passes the position sensing device 3 and the speed sensing device...

specific example 2

[0046] The soot preform 14 after external deposition is vertically suspended on the hanging rod 12 of the sintering tower, and the soot preform is slowly put into the sintering tube 18 through the lifting and translation of the servo motor 1; into the sintering tube, and placed on the sintering area of ​​the heating device, cover the upper part of the sintering tube with a cover 19 to form a relatively airtight sintering atmosphere; the control device 7 controls the heating element 15 through the electric heater driving part When the temperature rises to 1200°C, gas such as 0.6 splm chlorine and 25 slpm helium is introduced into the sintered tube from the gas supply part 11 for dehydration. The proportion of gas is controlled at 2.3%; the dehydration time is 0.75 hours, and after the end, the electric heater driving part 6 controls the heating element 15 to raise the furnace temperature to 1550 °C; the control device 7 passes the position sensing device 3 and the speed sensing ...

specific example 3

[0048] The soot preform 14 after external deposition is vertically suspended on the hanging rod 12 of the sintering tower, and the soot preform is slowly put into the sintering tube 18 through the lifting and translation of the servo motor 1; into the sintering tube, and placed on the sintering area of ​​the heating device, cover the upper part of the sintering tube with a cover 19 to form a relatively airtight sintering atmosphere; the control device 7 controls the heating element 15 through the electric heater driving part When the temperature rises to 1200°C, gas such as 10 splm chlorine and 20 slpm helium is introduced into the sintered tube from the gas supply part 11 for dehydration. The ratio of dehydration is controlled at 4.7%; the dehydration time is 0.5 hours, and after the end, the electric heater driving part 6 controls the heating element 15 to raise the furnace temperature to 1550 ° C; the control device 7 is controlled by the position sensing device 3 and the sp...

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Abstract

A sintering apparatus for prefabricatnig the loosen optical fibre rod is composed of sintering quartz pipe with gas inlet and cover, heating unit with casing, insulating material and heater, moving controller, position sensor, gas supplying unit, temp sensor with heating driver, and controller.

Description

1. Technical field: [0001] The invention relates to a sintering device for a loose body optical fiber prefabricated rod, in particular to a sintering device for a loose body optical fiber prefabricated rod core rod prepared by an OVD or VAD method. 2. Background technology: [0002] At present, the most common outer cladding processing methods for optical fiber preforms in the world are OVD and VAD methods. These two outer cladding deposition methods are relatively similar. Both deposit pure SiO2 on the outside of the core rod to make a porous loose body, and then put it in a sintering furnace for dehydration and sintering to make a transparent large optical fiber preform. [0003] Regardless of whether OVD or VAD is used to produce core rods and outer cladding, the generated soot core rods and soot finished rods must be placed in a heating furnace, and Cl2 and He must be introduced at a certain temperature for dehydration and sintering. Produce transparent core rods and fi...

Claims

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Application Information

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IPC IPC(8): C03B19/06C03B37/012
CPCC03B37/0146
Inventor 查健江卞进良康晓健吴江严薇江峰
Owner JIANGSU FASTEN PHOTONICS
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