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Preparation method of large-size optical fiber preform

An optical fiber preform and large-size technology, applied in the field of optical fiber manufacturing, can solve the problems of high cost of pure natural quartz sand, difficult to control the uniformity, and low deposition rate, so as to save wire drawing processing time and material cost, and facilitate large-scale production , Excellent effect of optical parameters

Active Publication Date: 2015-10-14
YANGTZE OPTICAL FIBRE & CABLE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sleeve method has the following disadvantages: large-size sleeves require high geometric accuracy, the manufacturing process is complicated, and material loss during sleeve processing leads to increased costs
[0006] The in-pipe method PCVD and MCVD are suitable for preparing complex structures with high precision, but the deposition rate of the two is lower, less than 3g / min, and the in-pipe method cannot prepare large-scale preforms alone, and the purity of the raw material gas is required to reach 99.9999%. , the high cost makes the application limited
[0007] The deposition rate of APVD is high, but the raw material of high-purity natural quartz sand is high in cost and the uniformity is not easy to control, which makes this process not easy to be widely used

Method used

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  • Preparation method of large-size optical fiber preform
  • Preparation method of large-size optical fiber preform
  • Preparation method of large-size optical fiber preform

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: Matched cladding low water peak single-mode optical fiber prefabricated rod.

[0031] VAD is used to prepare transparent solid quartz rods, including the core layer and part of the cladding. After dehydration and sintering, the loose body prepared by VAD is transformed into a transparent solid quartz rod, and then undergoes shaping treatment. After shaping, the cladding / core layer The diameter ratio b / a is 2.9~3, the length of the effective part reaches 2 / 3 of the total length, and the fluctuation range of the diameter of the effective part is less than 4%, and the surface roughness of the transparent solid quartz rod is less than 20 μm. The quartz rod is fused with a high-purity thick-walled quartz tube set with an outer diameter of 45 mm, an inner diameter of 28 mm, and an inner surface roughness of less than 20 μm to form a quartz rod to obtain a primary optical fiber preform with a uniform structure. The hydroxyl content of the thick-walled tube is le...

Embodiment 2

[0032] Embodiment 2: a depressed-clad single-mode optical fiber prefabricated rod.

[0033] A transparent solid quartz rod is prepared by VAD, including a core layer and a partial cladding layer, the cladding layer contains F, and the cladding / core layer diameter ratio b / a of the transparent solid quartz rod is 2.4 after shaping. The quartz rod is fused with a high-purity thick-walled quartz tube set with an outer diameter of 45 mm, an inner diameter of 28 mm, and an inner surface roughness of less than 20 μm to form a quartz rod to obtain a primary optical fiber preform with a uniform structure. The hydroxyl content of the thick-walled tube is less than 100 ppb. Using the optical fiber preform as a target rod, SiO was deposited by external method (OVD) 2 After the outer cladding is deposited, it is sintered into a transparent optical fiber preform with a diameter of 150mm. One end of the preform is a suspended end. In order to facilitate wire drawing, the suspended end is ...

Embodiment 3

[0034] Embodiment 3: Low water peak anti-bending single-mode optical fiber prefabricated rod.

[0035]A transparent solid quartz rod was prepared by VAD, including a core layer and a partial cladding layer. After shaping, the core-cladding ratio b / a of the transparent solid quartz rod was 1.8. Melt and shrink the quartz rod with a high-purity thick-walled quartz tube with an outer diameter of 50 mm, an inner diameter of 30 mm, and an inner surface roughness less than or equal to 20 μm to form a quartz rod to obtain a primary optical fiber preform with a uniform structure. The thick-walled tube contains F and The hydroxyl content is less than 50ppb. Using the optical fiber preform as a target rod, SiO was deposited by external method (OVD) 2 After the outer cladding is deposited, it is sintered into a transparent optical fiber preform rod with a diameter of 200mm, and the diameter fluctuation of its effective part is less than 1mm. One end of the preform rod is a suspension...

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Abstract

The invention relates to a method for manufacturing a large-diameter optical fiber perform rod. The method includes: manufacturing a transparent solid quartz rod in an axial vapour deposition method through follow-up processing, wherein the transparent quartz rod comprises a core layer and a part of wrapping layer; filling the transparent quartz rod in a high-purity thick-wall quartz tube in a sleeve mode to form a primary optical fiber perform rod even in structure in concentration mode through high-temperature melting; and using the primary optical fiber perform rod as a target rod, depositing a SiO2 wrapping layer through an external vapour deposition method, and after the deposition, sintering the rod into the transparent optical fiber perform rod. By means of the method, a plurality of intermediate working procedures for manufacturing optical fibers in a pipe sleeve method are omitted, production efficiency of the optical fiber perform rod is effectively improved, cost is reduced, the processing property is stable, the optical parameters of the optical fibers are excellent, and scale production is facilitated.

Description

technical field [0001] The invention relates to a method for preparing a large-size optical fiber preform, which belongs to the technical field of optical fiber manufacturing. Background technique [0002] Optical fiber preform preparation is the main process of optical fiber manufacturing technology. The use of large-size optical fiber preform drawing can effectively improve the utilization rate of raw materials, and at the same time can effectively save production time and improve production efficiency. Large-size optical fiber preform has become the mainstream trend in the current market. At present, large-size optical fiber preforms are divided into: large-size solid preforms and sleeve plus core rod preforms. [0003] The currently mainstream method for large-scale low-water-peak optical fiber preforms is the casing method, such as US005837334A and US007089765B2. At present, the sleeve method is to manufacture a mandrel first, then insert the mandrel into a quartz gla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B37/018
CPCC03B37/01446Y02P40/57
Inventor 曹蓓蓓倪先元
Owner YANGTZE OPTICAL FIBRE & CABLE CO LTD
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