Optical fiber perform and manufacture method thereof

A technology of optical fiber preform and manufacturing method, which is applied in the field of optical communication, can solve the problem of insufficient bending performance of optical fiber, and achieves the effects of low cost, remarkable effect and improved production efficiency

Inactive Publication Date: 2009-11-25
YANGTZE OPTICAL FIBRE & CABLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But once the cladding is too thick, the formed fluorine-doped cladding will be far away from the core layer and will not play a role in improving the bending performance of the drawn optical fiber.

Method used

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  • Optical fiber perform and manufacture method thereof
  • Optical fiber perform and manufacture method thereof
  • Optical fiber perform and manufacture method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The G.652 low water peak optical fiber core rod is prepared by PCVD process, which has an optical fiber core rod core layer 1 and an optical fiber core rod partial cladding layer 2; the outer diameter of the liner used is 31 mm, the wall thickness is 2 mm, and the refractive index of the core rod rate profile as Figure 5 As shown; the fluorine-doped quartz tube prepared by the OVD process is stretched into a small casing 3 of the required size after mechanical processing, and the OH content in the small fluorine-doped quartz casing is 10-500ppb; the optical fiber core rod and The small fluorine-doped quartz sleeve is melted and shrunk together to make a combined mandrel, and then the surface is etched with hydrofluoric acid (HF). and a quartz tube with an inner diameter (ID) as a large casing 4, which is assembled by RIC process Figure 4 In the shown RIC process prefabricated rod, the combined core rod 5 is set in the large sleeve 4 and the center of the combined cor...

Embodiment 2

[0067] Prepare G.652 low water peak optical fiber core rod and mother rod by VAD process, using H 2 / O 2 Extend it into the RIC mandrel of the required core diameter by flame, then use hydrofluoric acid (HF) to etch the surface into the mandrel of the target outer diameter, and use the small sleeve and scheme in Example 1 to make the combined mandrel , a large quartz sleeve with an outer diameter of 200 mm and an inner diameter of 53 mm is used to assemble a RIC preform. The relevant parameters of the combined mandrel are shown in Table 3. On the stretching tower, the combined mandrel and the large sleeve are melted together and stretched into a small-sized solid preform with an outer diameter of 80 mm before drawing. The optical fiber coating material for single-mode optical fiber production is used. The drawing speed is 1500 m / min, the diameter of the bare fiber is 124 μm to 126 μm; the main parameters of the drawn fiber are shown in Table 4.

[0068] Table 3. Relevant pa...

Embodiment 3

[0074] In the VAD or OVD manufacturing cladding deposition process, due to the use of H 2 / O2 Therefore, the OH pollution to the core rod is obvious; in the plasma spraying technology, not only the OH content in the deposited glass is relatively high, but also the OH in the environment will be adsorbed on the target rod and diffuse inward; once The diffusion of OH into the core layer of the preform will cause the increase of the water peak of the optical fiber. Whether OH can diffuse inward into the core layer of the preform 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, and increasing the c / a value will increase the manufacturing cost of the mandrel. Fluorine-doped quartz glass can effectively prevent the diffusion of external hydroxyl groups to the core layer, and the corresponding reaction equation is:

[0075]

[0076] Adopt No. 5 mandrel in embodiment one, incr...

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Abstract

The invention relates to an optical fiber perform and manufacture method thereof, characterized in that: the ratio of the diameter of the optical fiber core rod to the core layer diameter b / a is 2.1-2.8; the optical fiber core rod is sleeved in the fluorine-doped quartz glass small casing and the optical fiber core rod and the fluorine-doped quartz glass small casing are fused together to form a combination core rod and the ratio of the diameter difference between the combination core rod and the optical fiber perform to the core layer diameter (c-b) / a is 0.5-2.2; the fluorine-doped amount of the fluorine-doped quartz glass small casing Delta F is -0.20% to -0.35% and the hydroxyl group content is smaller than or equal to 500 ppb; a pure quartz glass big casing is arranged on the combination core rod according the to RIC technology or a SiC2 glass surrounding layer directly deposits on the combination core rod and the ratio of the effective diameter of the optical fiber perform to the diameter of the combination core rod d / c IS 2.0-5.6. The bending-countering lower water peak monomode fiber is prepared and the optical fiber capable of satisfying TIU-T G.652.D and G.657 is prepared.

Description

technical field [0001] The invention relates to a method for manufacturing an optical fiber preform and an optical fiber thereof, and a method for manufacturing an optical fiber by using the preform, in particular to a method for manufacturing an anti-bending low water peak single-mode optical fiber preform and an optical fiber thereof, and belongs to the technical field of optical communication. Background technique [0002] In optical fiber manufacturing, the existence of absorption peaks (commonly known as "water peaks") caused by hydroxyl (OH) in the range of 1360nm to 1460nm limits the use of this window. If it is used in the range of 1360nm to 1460nm, it is necessary to eliminate the influence of the water peak in this band. Such an optical fiber can provide an available wavelength band as wide as 400nm. According to the ITU-T G.652.C / D specification, its attenuation within the range of 1383±3nm is less than the specified value of 1310nm, and it is generally called "lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B37/01C03B37/014C03B37/027
CPCC03B2201/075C03B2201/12C03B37/01211C03B2203/22Y02P40/57Y10T428/2949
Inventor 韩庆荣杨晨刘泳涛罗杰拉吉·马泰
Owner YANGTZE OPTICAL FIBRE & CABLE CO LTD
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