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Large size rock quartz optical fibre prefabricated bar manufacturing method

A quartz optical fiber, large-scale technology, applied in the field of optical fiber manufacturing, can solve the problems of fluctuation of core-skin ratio, limited size, difficult to control geometric accuracy, etc., to achieve the effect of low-cost manufacturing and prevention of secondary pollution

Inactive Publication Date: 2008-12-24
JIANGSU HENGTONG PHOTOELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent 200610052195.X discloses such a method for manufacturing large-sized preform rods. This method requires the mandrel to have good geometric precision and uniformity. However, the large-size mandrel made by VAD technology is not easy to control the geometric precision. , the core-to-core ratio fluctuates greatly, which limits the size of the manufactured preform

Method used

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  • Large size rock quartz optical fibre prefabricated bar manufacturing method
  • Large size rock quartz optical fibre prefabricated bar manufacturing method

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Manufacture Φ120mm×1500mm optical fiber preform.

[0025] The G652D single-mode fiber is produced by using a sleeve 7 with an inner diameter of 55mm, an outer diameter of 158mm, and a length of 1500mm. The bare fiber diameter of the target fiber is 125um, the core diameter of the fiber is 8um, and the cladding ratio Rf of the fiber is 15.625. Because a certain space needs to be left between the sleeve pipe 7 and the mandrel 6, the main sample can allow the mandrel 6 to have certain curvature and unevenness, so the diameter of the mandrel 6 after extension is set to be 50 mm. by the formula Dr 2 ×V=Rr 2 ×[(Do 2 -Di 2 ) / (Rf 2 -Rr 2 )] It can be calculated that when the speed of the mandrel 6 is the same as that of the sleeve 7, that is, when V is 1, the reference Rr=4.997. Therefore setting the design core wrapping ratio of the core rod 6 prepared by the VAD process in the present invention is 5.0, subject to the limitation of VAD equipment and technology, the stand...

Embodiment 2

[0033] Manufacture Φ80mm×2000mm optical fiber preform.

[0034] The G652D single-mode fiber is produced by using a sleeve 7 with an inner diameter of 50mm, an outer diameter of 180mm, and a length of 3000mm. The bare fiber diameter of the target fiber is 125um, the core diameter of the fiber is 8um, and the cladding ratio Rf of the fiber is 15.625. Because there needs to be a certain space between the casing 7 and the mandrel 6, the mandrel 6 can be allowed to have a certain degree of curvature and unevenness, so the diameter of the mandrel 6 after extension is set to be 45 mm. by the formula Dr 2 ×V=Rr 2 ×[(Do 2 -Di 2 ) / (Rf 2 -Rr 2 )] It can be calculated that the reference Rr=3.9352 when the speed of the mandrel 6 is the same as that of the casing 7, that is, when V is 1. Therefore, the design core wrapping ratio of the mandrel 6 prepared by the VAD process is set to be 4.0, subject to the limitations of the VAD equipment and technology, the standard deviation of the m...

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Abstract

The invention relates to a method for preparing a large size silica optical fiber perform rod comprising: preparing a large size mandrel by VAD art, inserting the mandrel after the mandrel is extended and the axial distribution of the core-spun is tested into a silica casing, conducting the HF acid washing and pure water cleaning and drying to the mandrel and casing surface before the insertion, then putting the combination of the mandrel and the silica casing into an extending furnace, respectively arranging caudal peduncles of the mindrel and the casing into each clamp, putting the casing and the mindrel into the extending furnace according to respective speed after the extending furnace is warmed up, adjusting the mandrel inserting speed according to the axial distribution of self core-spun, arranging a sealing device on top of the casing caudal peduncle, vacuum pumping the gap between the mandrel and the casing to seal with the outside. The method adopts asynchrony extension method of the mandrel and casing to control the inserting speed of the mandrel, solves the problem that the large fluctuation of the core-spun restricts the production of the large size perform rod, while the vacuum pumping of the gap between the mandrel and the casing to seal with the outside can prevents the secondary pollution during the rotation extension process. The invention discloses a large size silica optical fiber perform rod production method at a high efficiency and low cost.

Description

technical field [0001] The invention relates to a method for manufacturing an optical fiber preform rod in the field of optical fiber manufacturing, in particular to a method for manufacturing a large-size silica optical fiber preform rod. Background technique [0002] Manufacturing large-sized silica optical fiber preforms and increasing the drawable fiber length of a single preform are effective ways to improve optical fiber production efficiency and reduce production costs. Existing methods for manufacturing large-sized optical fiber preforms usually first use axial vapor deposition process (VAD process) to manufacture large-sized quartz core rods, then insert the core rods into the quartz sleeve to form an assembly, and then heat the assembly to soften and Melted into large size preforms. Chinese patent 200610052195.X discloses such a method for manufacturing large-sized preform rods. This method requires the mandrel to have good geometric precision and uniformity. Howe...

Claims

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Application Information

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IPC IPC(8): C03B37/018
CPCC03B37/01245
Inventor 江平肖华顾志华柳锦炜
Owner JIANGSU HENGTONG PHOTOELECTRIC
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