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Radiation-resistant optical fiber preparation method

A radiation-resistant, optical fiber preform technology, applied in the field of optical fiber manufacturing, to suppress uneven stress distribution, reduce radiation sensitivity, and achieve the effects of large-scale manufacturing

Active Publication Date: 2019-04-05
FENGHUO COMM SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of the present invention sequentially performs annealing, hydrogen loading and pre-irradiation pretreatment on the optical fiber preform, so that the prepared optical fiber has good radiation resistance, which effectively solves the problem that the existing radiation-resistant optical fiber can only be obtained by vapor deposition process and deep Difficulties that can only be produced by fluorine doping process

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  • Radiation-resistant optical fiber preparation method

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preparation example Construction

[0031] Therefore, an embodiment of the present invention provides a method for preparing a radiation-resistant optical fiber, which includes the following steps:

[0032] S1, annealing the optical fiber preform to obtain an annealed optical fiber preform;

[0033]S2, carrying hydrogen on the annealed optical fiber preform to obtain a hydrogen-loaded optical fiber preform;

[0034] S3, performing pre-irradiation on the hydrogen-loaded optical fiber preform to obtain a pre-irradiated optical fiber preform;

[0035] S4, drawing the pre-irradiated optical fiber preform to obtain a radiation-resistant single-mode optical fiber or a radiation-resistant multi-mode optical fiber.

[0036] The optical fiber preform to be processed in the method of the present invention is a commercial optical fiber preform, and its main component is optical fiber grade high-purity SiO 2 Glass. It is easy to understand that in order to meet the requirements of waveguide structure and optical fiber pe...

Embodiment 1

[0056] Select a clean and complete commercial single-mode optical fiber preform with a length of 1050 mm and a diameter of 80 mm, and place it in a box-type resistance furnace. First, the optical fiber preform is heated to the set temperature T 1 =980℃, heat preservation t 1 = After 3.5h, in K 1 =1.2°C / min annealing rate down to target temperature T 2 =840°C, then stop heating and cool down naturally with the furnace. The cooled optical fiber preform is placed in a hydrogen pressure tank, the hydrogen pressure is 1.0 MPa, the hydrogen concentration is greater than 99v%, and the hydrogen loading time is 12 hours. After the hydrogen loading is completed, the optical fiber preform is placed in an irradiation facility under room temperature and air environment for γ-ray pre-irradiation. The radiation dose rate of the optical fiber preform is 50Gy / h, and the total radiation dose is 1.70kGy. After the above pretreatment of the optical fiber preform is completed, the single-mode...

Embodiment 2

[0058] Select a clean and complete commercial single-mode optical fiber preform with a length of 700 mm and a diameter of 72 mm, and place it in a box-type resistance furnace. First, the optical fiber preform is heated to the set temperature T 1 =1050℃, heat preservation t 1 = After 5h, take K 1 =0.7°C / min annealing rate to cool down to target temperature T 2 =940°C, then stop heating and cool down naturally with the furnace. The cooled optical fiber preform is placed in a hydrogen pressure tank, the hydrogen pressure is 1.5MPa, the hydrogen concentration is greater than 99v%, and the hydrogen loading time is 8h. After the hydrogen loading is completed, the optical fiber preform is placed in an irradiation facility under room temperature and air environment for γ-ray pre-irradiation. The radiation dose rate of the optical fiber preform is 85Gy / h, and the total radiation dose is 1.25kGy. After the above pretreatment of the optical fiber preform is completed, the single-mod...

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Abstract

The invention discloses a radiation-resistant optical fiber preparation method, and relates to the field of optical fiber manufacturing. The method includes the following steps: sequentially preforming annealing, hydrogen loading and pre-irradiation pretreatment on an optical fiber preform; preforming wire-drawing on the pretreated optical fiber preform to obtain a radiation-resistant single-modeoptical fiber or a radiation-resistant multi-mode optical fiber. The method can completely eliminate the material defects in quartz glass, inhibit the uneven stress distribution in the optical fiber preform, and reduce the attenuation of the wire-drawn optical fiber; and meanwhile, the radiation sensitivity of the optical fiber can be effectively reduced, and the rapid preparation of the radiation-resistant optical fiber is facilitated; and the radiation-resistant level of the wire-drawn optical fiber as a whole is improved, so that the method is beneficial to realizing large-scale manufacturing of the radiation-resistant optical fiber. In addition, the method does not limit the types of optical fiber preforms and has wide application range.

Description

technical field [0001] The invention belongs to the field of optical fiber manufacturing, and in particular relates to a method for preparing a radiation-resistant optical fiber. Background technique [0002] With the continuous development of modern communication technology, communication equipment used under special environmental conditions requires higher data transmission volume and transmission speed. In aerospace, nuclear power engineering, medical equipment and other fields, due to the existence or use of radioactive sources / high-energy particle rays, strict requirements are placed on communication media (especially optical fiber cables themselves). In the irradiation condition, the radiation rays that mainly threaten communication equipment and communication optical fibers are gamma rays. In the optical fiber in the irradiated environment, the main quartz material is affected by γ-rays to generate free electrons and holes, which are captured by the oppositely charge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B37/025C03B37/012
CPCC03B37/012C03B37/025C03B37/01853C03B2201/21C03B37/01446C03C25/6246C03C25/002Y02P40/57
Inventor 张一弛喻煌骆城祝威陈黎明刘骋陈卫华张龙强孙伟麻金娜苏玉军
Owner FENGHUO COMM SCI & TECH CO LTD
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