Large-size optical fiber preform and manufacturing method of optical fiber thereof

An optical fiber preform and manufacturing method technology, applied in the directions of clad optical fibers, glass optical fibers, manufacturing tools, etc., can solve the problems affecting the low water peak performance and bending resistance performance of optical fibers, many socket interfaces, and many processing links, etc., Achieve the effect of ensuring low water peak performance, ensuring low attenuation performance, and improving production efficiency

Active Publication Date: 2010-11-24
YANGTZE OPTICAL FIBRE & CABLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The large-size preform needs to be spliced ​​and shrunk twice. Not only are there many processing links and the process is relatively complicated, but also the low water peak performance and bending resistance of the optical fiber will be affected due to the many splice interfaces.

Method used

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  • Large-size optical fiber preform and manufacturing method of optical fiber thereof
  • Large-size optical fiber preform and manufacturing method of optical fiber thereof
  • Large-size optical fiber preform and manufacturing method of optical fiber thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] The optical fiber core rod is prepared by the PCVD process. The liner used is a fluorine-doped liner, which is prepared by the OVD process. The fluorine-doped liner is cleaned and fully dried before deposition, and the deposited fluorine-doped tube is melted and shrunk in an electric heating furnace After being corroded, cleaned and dried, the core rod is assembled into a RIC process preform with a high-purity quartz tube. The main parameters of the preform are shown in Table 1; the RIC preform is directly drawn, and the two-layer Optical fiber coating material, the drawing speed is 1500m / min, the fiber diameter is 125±0.7μm, and the pressure inside the RIC is controlled to be 1,000pa~10,000pa. The main performance parameters of the drawn fiber are shown in Table 2.

[0076] Table 1. Basic parameters of the preform rod of embodiment 1

[0077]

[0078] Table 2. Main properties of the drawn optical fiber of embodiment 1

[0079]

[0080] In Example 1, the CSA of ...

Embodiment 2

[0084] In the OVD or VAD manufacturing outer cladding deposition process, due to the use of H2 / O2 flame, the hydroxyl pollution of the core rod is obvious; when the APVD process is used, not only the hydroxyl content in the deposited glass is high, but also in the environment The hydroxyl groups in the target rod will also be adsorbed on the target rod and diffuse inward; once the hydroxyl group diffuses into the core layer of the core rod, it will cause an increase in the water peak of the optical fiber. Whether the hydroxyl group can diffuse inward into the core layer of the core rod mainly depends on the diffusion distance and diffusion coefficient. The way to increase the diffusion distance is to increase the c / a value of the mandrel. The core rods with different c / a values ​​are manufactured by the same method as in Example 1, and the OVD and APVD processes are used to manufacture the outer cladding, and the outer diameter is 145-155mm. ±0.7μm, the relationship between t...

Embodiment 3

[0086] The optical fiber core rod is prepared by the PCVD process. The liner used is a fluorine-doped liner, which is prepared by the OVD process. The fluorine-doped liner is cleaned and fully dried before deposition, and the deposited fluorine-doped tube is melted and shrunk in an electric heating furnace into a solid mandrel, and the mandrel is corroded, cleaned and dried and assembled into a RIC process preform by RIC process and high-purity quartz tube. The main parameters of the preform are shown in Table 3; Optical fiber coating material, the drawing speed is 1500m / min, the fiber diameter is 125±0.7μm, and the pressure inside the RIC is controlled to be 1,000pa~10,000pa. The main performance parameters of the drawn fiber are shown in Table 4.

[0087] In embodiment 3, the CSA of the used fluorine-doped liner is less than the area of ​​the ring where the sunken cladding in the designed core rod is, so it is necessary to deposit part of the fluorine-doped sunken cladding b...

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Abstract

The invention relates to a large-size optical fiber preform and a manufacturing method of the optical fiber thereof. A fluorine-doped liner tube is used as a base tube for depositing cladding layers and a core layer and is melted and shrunk into a solid mandril, and then the solid mandril and a sleeve form the preform; or the cladding layer part is deposited on the surface of the solid mandril to directly form the mandril to draw wire on a wire drawing tower. Wire drawing also can be carried out on the preform or solid mandril before stretching. During the wire drawing process, the optical fiber is coated with two layers of coating so as to obtain a mono-mode optical fiber with high anti-fatigue parameter, low water peak and insensitivity to bending. The manufacturing method has the advantages of large preform size, long wire drawing length of a single preform, relatively simple process and low cost and is remarkably suitable for scale production. The optical fiber manufactured by the method has a low water peak, extremely low optical loss caused by bending and relatively high anti-fatigue parameter and is particularly applicable to the optical fiber to be used when bent radius is small, such as an optical fiber access network (FTTx) or a small optical device.

Description

technical field [0001] The invention relates to an optical fiber preform and a method for manufacturing the optical fiber, in particular to a large-size bending-insensitive low-water peak single-mode optical fiber preform and a method for manufacturing the optical fiber, belonging to the field of optical fiber communication. Background technique [0002] Due to the existence of absorption peaks (commonly referred to as "water peaks") caused by hydroxyl groups (-OH) in the optical fiber in the range of 1360nm to 1460nm (E-band), the use of this communication window is greatly limited. In order to realize the full-wave communication of optical fiber, it is necessary to effectively eliminate the influence of the water peak in this band. The successful opening of the E-band communication window will enable the optical fiber to provide a communication band close to 400nm width (ie 1260nm ~ 1625nm), such optical fiber is generally called "low water peak fiber", "zero water peak fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B37/018
CPCG02B6/02C03B2205/14C03B2201/075G02B6/03633G02B6/02395C03B37/02754C03B37/01211C03B2205/09C03B2203/23C03B2201/02G02B6/0285C03B2201/12G02B6/0283C03B37/014C03B2201/86C03B2201/04C03B37/0183C03B37/01892C03C13/045C03C2201/12C03C2201/23C03C2201/31C03C2203/40Y02P40/57
Inventor 杨晨韩庆荣童维军罗杰刘泳涛
Owner YANGTZE OPTICAL FIBRE & CABLE CO LTD
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