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A low-attenuation single-mode optical fiber and its preparation method

A single-mode optical fiber, low attenuation technology, applied in cladding optical fiber, glass manufacturing equipment, multi-layer core/clad optical fiber, etc., can solve the problems of difficult process control, high cost, and large amount of F doping in the cladding , to achieve the effect of stable process, low cost and increased wire drawing length

Active Publication Date: 2020-04-21
SHANTOU HIGH TECH ZONE AOXING OPTICAL COMM EQUIP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Both of these two U.S. patents can obtain lower fiber attenuation, but the amount of F doping in the cladding is large, the process control is difficult, and the cost is also high

Method used

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  • A low-attenuation single-mode optical fiber and its preparation method
  • A low-attenuation single-mode optical fiber and its preparation method
  • A low-attenuation single-mode optical fiber and its preparation method

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Embodiment Construction

[0049] The present invention will be further described in detail below in conjunction with the examples.

[0050] The present invention prepares the method for low-attenuation single-mode optical fiber, such as figure 1 and figure 2 As shown, the mandrel soot is deposited by the VAD process, including the core layer and the inner cladding layer, and a certain flow rate of fluorine-containing raw materials is introduced during the deposition of the inner cladding layer. The fluorine-containing raw materials are CF4, SF6, C2F6, and SiF4. One or more, to obtain the fluorine-doped inner cladding, dehydrate and sinter the core rod soot to obtain a glass core rod, and the core rod is used as a target rod after annealing treatment, and an outer cladding layer is deposited on the outside of the target rod by OVD process, and deposited In the process, a certain flow rate of fluorine-containing raw materials is introduced, and the fluorine-containing raw materials are one or more of C...

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Abstract

The invention relates to a low-attenuation single-mode fiber and a preparation method therefor. The diameter a of a core layer is from 7.0 microns to 8.0 microns, and the relative refractive index difference delta1 is 0.10%-0.20%. The exterior of the core layer is sequentially wrapped by an inner cladding layer and an outer cladding layer. The diameter b of the inner cladding layer is 25-28 microns, and the relative refractive index difference delta2 is from -0.05% to -0.25%. The diameter c of the outer cladding layer is 124-126 microns, and the relative refractive index difference delta3 is from -0.05% to -0.25%. A core rod is manufactured through the VAD technology, and the core layer and the inner cladding layer are formed. The core rod is taken as a target rod, and the outer cladding layer is deposited outside the target rod through the OVD technology, thereby forming the outer cladding layer. After sintering, a full-cladding fluorine-doped preformed rod is formed, and the preformed rod is drawn at the wire drawing speed of 1500-3300m / min to form optical fibers. Through the reduction of germanium doped in the core layer and the improvement of the viscosity of the core cladding layers, the method achieves the low attenuation of optical fibers. The preparation technology is simpler, and the manufacturing cost is low. Moreover, the technology is stable, and the qualified rate of production is high.

Description

technical field [0001] The invention relates to a low-attenuation single-mode optical fiber and a preparation method thereof, belonging to the technical field of optical fiber communication. Background technique [0002] Optical fiber communication has the characteristics of large transmission capacity, long transmission distance, and fast transmission speed, and is widely used in optical communication networks such as long-distance trunk networks, metropolitan area networks, and access networks. The single-mode fiber that meets the ITU-T G.652D standard is the most commonly used communication fiber. Reducing the attenuation coefficient of single-mode fiber can effectively increase the transmission distance of the optical fiber communication system, greatly reduce the number and cost of relay stations, and is of great significance for optimizing the structure of the transmission system and reducing operating costs. [0003] The main causes of optical fiber attenuation are: ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/02G02B6/028G02B6/036C03B37/027
CPCC03B37/027G02B6/02019G02B6/0281G02B6/03655
Inventor 陈刚朱继红杨轶汪洪海王瑞春
Owner SHANTOU HIGH TECH ZONE AOXING OPTICAL COMM EQUIP