Preparation method of optical fiber prefabricated rod

A technology of optical fiber prefabricated rods and core rods, applied in glass manufacturing equipment, glass fiber products, manufacturing tools, etc., can solve problems such as clusters, and achieve the effects of suppressing cluster effects, high stability, and low loss

Active Publication Date: 2013-07-24
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing an optical fiber preform, which can realize the uniform dispersion of rare earth ions at the nanometer level, thereby solving the problem that high-concentration doping of active ions in the core of an existing photonic crystal optical fiber easily leads to clusters

Method used

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  • Preparation method of optical fiber prefabricated rod
  • Preparation method of optical fiber prefabricated rod
  • Preparation method of optical fiber prefabricated rod

Examples

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preparation example Construction

[0020] Such as figure 1 As shown, the preparation method of the optical fiber preform of the present invention comprises the following steps:

[0021] (1) Dip the nanoporous quartz glass rod into a mixed solution containing dopant ions;

[0022] (2) the impregnated nanoporous quartz glass rod is dried under natural conditions;

[0023] (3) The dried nanoporous quartz glass rod is sintered at 1050°C to 1200°C to form a dense and transparent quartz glass core in a vacuum, carbon monoxide, chlorine, helium, argon or nitrogen environment. Great;

[0024] (4) Put a quartz glass tube on the outside of the arranged capillary structure;

[0025] (5) extracting one or more capillaries at the geometric center of the capillary structure;

[0026] (6) The capillary is replaced by a quartz glass core rod to form an optical fiber preform.

[0027] The heating process in step (3) includes: from room temperature to the interval of 100 degrees Celsius to 200 degrees Celsius, the heating r...

example 1

[0034] First, SiO with a diameter of 2.86mm, a length of 500mm, and an average pore 2 A nanoporous quartz glass rod with a weight percentage of 96% is immersed in a nitric acid solution containing neodymium nitrate and aluminum nitrate, the concentration of neodymium ions in the nitric acid solution is 0.1mol / L, and the concentration of aluminum ions is 0.1mol / L. The immersion time was 150 minutes.

[0035] Thereafter, the impregnated nanoporous silica glass rod was taken out and dried in air.

[0036] After the nanoporous quartz glass rod is completely dry, it is placed in a sintering furnace covered with carbon powder, and the temperature is raised according to the following heating process in a carbon monoxide environment.

[0037] From room temperature (25°C) to 100°C, the heating time is 90 minutes (the heating rate is 0.83°C / min), and the temperature is kept at 100°C for 120 minutes; from 100°C to 600°C, the heating time is 300 minutes (the heating rate is 1.67°C) / min...

example 2

[0044] First, SiO with a diameter of 7mm, a length of 500mm, and an average pore 2 A nanoporous quartz glass rod with a weight percentage of 96% is immersed in an aqueous solution containing ytterbium nitrate and aluminum nitrate, the concentration of ytterbium ions in the aqueous solution is 0.2 mol / L, the concentration of aluminum ions is 0.6 mol / L, and the immersion time is 150 minutes.

[0045]Thereafter, the impregnated nanoporous silica glass rod was taken out and dried in air.

[0046] After the glass is completely dry, it is placed in a vacuumized sintering furnace, and the temperature is raised according to the following heating process:

[0047] From room temperature (25°C) to 200°C, the heating time is 175 minutes (the heating rate is 1°C / min), and the temperature is kept at 200°C for 120 minutes; from 200°C to 750°C, the heating time is 275 minutes (the heating rate is 2°C) / min), kept at 750°C for 90 minutes; from 750°C to 950°C, the heating time was 100 minutes ...

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Abstract

The invention discloses a preparation method of an optical fiber prefabricated rod. The preparation method comprises the following steps: soaking a nano-porous quartz glass rod into mixed solution containing doping ions; drying the soaked nano-porous quartz glass rod under a natural condition; increasing the temperature of the dried nano-porous quartz glass rod under the vacuum, carbon monoxide, chlorine, helium, argon or nitrogen environment, then sintering the nano-porous glass rod to be a compact and transparent quartz glass core rod under the temperature being 1050 DEG C-1200 DEG C after temperature raising process; sleeving a quartz glass tube outside an arranged capillary tube structure; drawing one or a plurality of capillary tubes at the geometric center of the capillary tube structure; using the quartz glass core rod to replace the capillary tubes to form the optical fiber prefabricated rod. According to the preparation method method, the nanoscale uniform dispersion of rear earth ions can be realized, so that the problem of the clustering easily caused by doping active ions in existing photonic crystal optical fiber core with high density can be solved.

Description

technical field [0001] The invention relates to a method for preparing an optical fiber component, more specifically, the invention relates to a method for preparing an optical fiber preform rod. Background technique [0002] In the existing active optical fiber field, the main preform preparation methods include metal chemical vapor deposition (metal chemical vapor deposition, MCVD for short) and multi-component glass melting method. However, these two preparation methods have the following problems: ① In terms of structure, large mode field structure fibers cannot be obtained effectively; ② In terms of doping, it is impossible to obtain high-concentration doped fibers due to the characteristics of rare earth ions themselves that cause clusters in quartz glass. Miscellaneous optical fiber; ③ Although the doping concentration of multi-component glass has been increased, its inherent shortcomings, such as large background loss, poor chemical stability, and weak mechanical str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B37/012
CPCC03B37/0122C03B37/01262C03B2203/04C03B2201/34C03B2203/14C03B2203/42
Inventor 杨旅云刘自军李进延彭景刚戴能利蒋作文李海清余阳
Owner HUAZHONG UNIV OF SCI & TECH
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