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Optical fiber preform and preparation method thereof

A technology of optical fiber prefabricated rods and core rods, applied in glass manufacturing equipment, manufacturing tools, etc., can solve the problems of fluorine element dissipation in the fluorine-doped layer, product performance fluctuations, and the inability to guarantee the stability of the fluorine-doped layer during the sintering process. Exposure time, effect of reducing impact

Active Publication Date: 2020-06-23
ZHONGTIAN TECH ADVANCED MATERIALS CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the two main ways are to increase the refractive index of the core layer and reduce the refractive index of the cladding layer, by doping germanium in the core layer, but too high doping concentration of germanium in the core layer will lead to the increase of Rayleigh scattering and affect the attenuation; for Lower the refractive index of the cladding and dope the cladding with fluorine, but the fluorine-doped layer will escape during the vitrification process of the fluorine-doped cladding tube, which cannot guarantee the stability of the fluorine-doped layer during the sintering process, resulting in The performance of the product fluctuates, and the actual bending resistance does not meet the expected effect

Method used

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  • Optical fiber preform and preparation method thereof
  • Optical fiber preform and preparation method thereof
  • Optical fiber preform and preparation method thereof

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preparation example Construction

[0031] The present invention also provides a method for preparing the optical fiber preform 100, which specifically includes the following steps:

[0032] Step S21, using a VAD deposition process to prepare a mandrel loose body;

[0033] Step S22, preparing a second fluorine-doped sinking layer outside the mandrel loose body;

[0034] Step S23, preparing an outer cladding layer outside the second fluorine-doped sinking layer to form an optical fiber preform.

[0035] see figure 2 , figure 2 It is a schematic flow chart of the method for preparing the optical fiber preform 100 in the first embodiment of the present invention, which specifically includes the following steps:

[0036] Step S21, preparing the mandrel loose body, using the first blowtorch, the second blowtorch and the third blowtorch to deposit sequentially from the inside to the outside, and injecting SiCl into the first blowtorch 4 Gas, GeCl 4 gas, oxygen, combustible gas and argon to form a germanium-dope...

Embodiment 1

[0052] Prepare the mandrel loose body, pass SiCl into the first blowtorch 4 Gas, GeCl 4 Gas, oxygen, hydrogen and argon form a germanium-doped core layer, in which SiCl 4 Gas and GeCl 4 The gas is passed into the first torch through argon as a transport carrier, GeCl 4 The flow rate of the gas is 200ml / min, the temperature is 105°C, the corresponding flow rate of argon is 200ml / min; the flow rates of hydrogen and oxygen are 4ml / min and 35ml / min respectively; SiCl 4 The gas flow rate is 5ml / min, the temperature is 95°C, and the corresponding argon flow rate is 150ml / min; the flame temperature of the first torch is 725°C. Pure SiCl is introduced into the second blowtorch 4 Gas, oxygen, hydrogen and argon form the middle cladding, in which pure SiCl 4 The gas is passed into the second torch through argon as a transport carrier, and the flow rates of hydrogen and oxygen are 6ml / min and 60ml / min respectively; pure SiCl 4 The gas flow rate is 15ml / min, the temperature is 100°C...

Embodiment 2

[0054] Prepare the mandrel loose body, pass SiCl into the first blowtorch 4 Gas, GeCl 4 Gas, oxygen, hydrogen and argon form a germanium-doped core layer, in which SiCl 4 Gas and GeCl4 gas are passed into the first blowtorch through argon as a transport carrier, the flow rate of GeCl4 gas is 200ml / min, the temperature is 105°C, the corresponding flow rate of argon gas is 200ml / min; the flow rates of hydrogen and oxygen are 4ml respectively / min and 35ml / min; SiCl 4 The gas flow rate is 5ml / min, the temperature is 95°C, and the corresponding argon flow rate is 150ml / min; the flame temperature of the first torch is 725°C. Pure SiCl is introduced into the second blowtorch 4 Gas, oxygen, hydrogen and argon form the middle cladding, in which pure SiCl 4 The gas is passed into the second torch through argon as a transport carrier, and the flow rates of hydrogen and oxygen are 6ml / min and 60ml / min respectively; pure SiCl 4 The gas flow rate is 15ml / min, the temperature is 100°C,...

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Abstract

The invention provides a preparation method of an optical fiber preform. The preparation method comprises the following steps: preparing a core rod loose body, sequentially carrying out deposition from inside to outside by using a first blowtorch, a second blowtorch and a third blowtorch, and introducing SiCl4 and GeCl4 gas into the first blowtorch to form a germanium-doped core layer; introducingSiCl4 gas into the second blowtorch to form a pure silicon middle cladding; introducing SiCl4 and fluorine-containing gas into the third blowtorch to form a first fluorine-doped sunken layer; preparing a second fluorine-doped sunken layer outside the core rod loose body; and preparing an outer cladding outside the second fluorine-doped sunken layer to form the optical fiber preform. According tothe preparation method of the optical fiber preform, the depth and width of the two fluorine-doped sunken layers are controlled, the first fluorine-doped sunken layer is shallow and wide, the second fluorine-doped sunken layer is deep and narrow, the exposure time of fluoride is greatly reduced, and the influence on bending loss is effectively reduced.

Description

technical field [0001] The invention relates to the field of optical fiber preform rods, in particular to an optical fiber preform rod and a preparation method. Background technique [0002] As the first link in the optical fiber industry chain, the production of optical fiber preforms is the core technology, and the production of core rods determines the function and level of preforms. The bending resistance of the optical fiber is one of the core parameters. In order to achieve the bending resistance, the relative refractive index of the core layer must be increased. At present, the two main approaches are to increase the refractive index of the core layer and reduce the refractive index of the cladding layer, by doping germanium in the core layer, but too high doping concentration of germanium in the core layer will lead to increased Rayleigh scattering and affect the attenuation; for Reduce the refractive index of the cladding and dope the cladding with fluorine, but th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B37/014C03B37/018
CPCC03B37/018C03B37/014Y02P40/57
Inventor 肖少峰陈子国钱宜刚沈一春吴椿烽秦钰
Owner ZHONGTIAN TECH ADVANCED MATERIALS CO LTD