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A kind of single-mode optical fiber preform rod and preparation method thereof

An optical fiber preform and single-mode optical fiber technology, which is applied in the field of optical communication, can solve the problems of realizing complex refractive index profile and insufficient Ge/F co-doping process, technical difficulty of hydroxy silica raw materials, and increase of optical fiber attenuation, and reduce construction costs. and operating costs, excellent attenuation performance, and the effect of reducing water peaks

Active Publication Date: 2016-08-24
SICHUAN LEFEI OPTOELECTRONICS TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to prepare large preforms with low water peaks, the technical route of out-of-tube + Soot direct outsourcing method also has shortcomings: a. The out-of-tube method has a separation process of Soot preparation and vitrification, and the process is relatively complicated; b. In the realization of complex refractive index Compared with the in-tube method, the cross-section and Ge / F co-doping process are obviously insufficient
Our country began to study the ordinary quartz raw material of quartz glass in the late 1980s, and has made some progress. The researched products can reach the level of second, third, and fourth-grade crystals, but they are only suitable for medium and low-grade quartz glass. The technical difficulty of hydroxyquartz raw material is still great
[0008] And the content of metal impurities contained in natural quartz, especially the concentration of alkali metal is relatively high, if the natural quartz sand material is directly used as the cladding material of the optical fiber preform, the high content of metal impurities will lead to a sharp increase in fiber attenuation
If in order to reduce the impurity content in natural quartz sand, other physical or chemical methods are simply used for storage, which will increase the cost of materials in a disguised form.

Method used

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  • A kind of single-mode optical fiber preform rod and preparation method thereof
  • A kind of single-mode optical fiber preform rod and preparation method thereof
  • A kind of single-mode optical fiber preform rod and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preform described in Example 1 includes two main parts: an optical fiber core rod prepared by PCVD method and a large casing made of hollow natural quartz sand material prepared by APVD method. The optical fiber core rod and large casing are assembled by ROD IN Cylinder method.

[0035] The core rod of the optical fiber prefabricated rod comprises a core layer, a first inner cladding layer and a second inner cladding layer. The optical fiber core layer prepared by PCVD is composed of quartz glass doped with fluorine and germanium: there are three cladding layers outside the core layer. The first inner cladding closely surrounds the core layer, which is made by the same PCVD deposition method as the core layer; the second inner cladding is composed of fluorine-doped OVD quartz glass; the third cladding is the outer cladding, which closely surrounds all of the second inner cladding layered.

[0036] The large casing prepared by the APVD process is prepared using four...

Embodiment 2

[0046] The optical fiber preform described in Example 2 includes two parts: the optical fiber core rod prepared by the PCVD method, and then using different grades of natural quartz sand materials, the core rod is directly sprayed on the core rod to form a preform forming body by the APVD method, and then externally The sprayed preformed body is subjected to vitrification treatment, and the surface of the preformed rod is machined after treatment to make the surface of the preformed rod smooth and the geometric parameters of the preformed rod uniform.

[0047] Table 4 shows the impurity content of the natural quartz sand used in this example.

[0048] Table 4 Analysis of the impurity content of the raw materials for the preparation of the hollow large casing by APVD

[0049]

[0050] Table 5 shows the parameters of two optical fiber preforms with different specifications and composition.

[0051] Table 5 Parameters of each component of optical fiber preform

[0052]

...

Embodiment 3

[0057] The preform described in Example 3 includes two parts: the optical fiber core rod prepared by the PCVD method and the large casing of the hollow natural quartz sand material prepared by the APVD method, and the optical fiber core rod and the large casing are assembled into an optical fiber by the Rod In Cylinder method Preform.

[0058] The core rod of the optical fiber preform includes a core layer, a first inner cladding layer, and a second inner cladding layer. The optical fiber core layer prepared by PCVD is composed of quartz glass doped with fluorine, germanium and other dopants: there are three cladding layers outside the core layer. The first inner cladding closely surrounds the core layer, which is made by the same PCVD deposition method as the core layer; the second inner cladding is composed of fluorine-doped OVD quartz glass; the third cladding is the outer cladding, which closely surrounds all of the second inner cladding layered.

[0059] The large casin...

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Abstract

The invention relates to a single mode fiber preform and a preparation method thereof. The single mode fiber preform comprises a single mode fiber core rod and a coat layer and is characterized in that the coat layer is prepared by the APVD (advance plasma vapor deposition) process taking natural quartz sand as a raw material; the content of metal impurities in the coat layer is less than or equal to 20ppm, the aluminum content is less than or equal to 15ppm, and the content of alkali metals is less than or equal to 1ppm; the ratio of the diameter of the core rod to the diameter of the core layer of the core rod is greater than or equal to 3.6; the diameter or equivalent diameter of the fiber preform is 100-200mm; the ratio of the diameter or equivalent diameter of the fiber preform to the diameter of the core rod is 2.5-4.4. In the invention, by taking the natural quartz sand material with low cost as the coat layer material of the fiber preform, the manufacturing cost of the fiber preform is effectively reduced; by controlling the concentration of metal impurities in the natural quartz sand material and designing a reasonable diameter ratio of the fiber core rod to the preform, the influence of the coat layer material on the fiber attenuation property is effectively reduced; based on complete compatibility with the G.652 standard, the attenuation property of the fiber is better than that of the conventional G.652 fiber.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a single-mode optical fiber preform used in an optical communication transmission system and a preparation method thereof. Background technique [0002] With the increasingly fierce competition in the optical fiber market, the market price of optical fiber has become a means of competition for more and more manufacturers. Improving the overall efficiency of the manufacturing process and reducing the manufacturing cost of optical fibers have attracted more and more attention. Increasing the size of the preform, prolonging the drawing time of a single preform, and improving the utilization of equipment are an effective means to improve the overall efficiency of production. At present, various optical fiber manufacturers are maximizing the drawing length of the optical fiber corresponding to a single optical fiber preform. Since the glass forming the cladding part of the optic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B37/018
Inventor 张磊王润涵李江李灿艾靓童维军龙胜亚
Owner SICHUAN LEFEI OPTOELECTRONICS TECH CO LTD
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