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Method of fabricating optical fiber perform

A technology of optical fiber preform and manufacturing method, which is applied to manufacturing tools, glass manufacturing equipment, glass deposition furnaces, etc., can solve the problems of reducing deposition efficiency and gas mixing ratio, and achieves the effect of high deposition efficiency

Active Publication Date: 2009-09-02
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, although the gas ejected from the small-diameter ejection port has little disturbance to the flow of the glass beads, there is a problem that a large gas linear velocity reduces the mixing ratio of the gas, thereby reducing the deposition efficiency.

Method used

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  • Method of fabricating optical fiber perform
  • Method of fabricating optical fiber perform
  • Method of fabricating optical fiber perform

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Use such as figure 1 The apparatus and OVD method shown deposit glass beads on the growth material. The growth material was formed by welding an empty rod having an outer diameter of 50 mm to both ends of the mandrel 1 . The mandrel 1 also has an outer diameter of 50 mm and a length of 2000 mm. by as Figure 2A and Figure 2B The illustrated burner 100 with a coaxial quintuple tube structure deposits microbeads to produce an optical fiber preform.

[0038] The burner 100 includes: a first pipe 101 arranged in the center of the burner 100 to form a glass raw material gas ejection port 101P; and a second pipe 102 arranged outside the first pipe 101 to form a sealing gas ejection port 102P for ejecting the sealing gas; and a third pipe 103 arranged further outside the second piping 102 to form a flammable gas ejection port 103P for ejecting the flammable gas. The burner 100 also includes eight small-diameter combustion assist gas jetting port nozzles 106 accommodated ...

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PUM

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Abstract

A method of fabricating an optical fiber preform that can give stable and high deposition efficiency from the start to the end of the deposition when synthesizing a large size preform. When fabricating a preform by hydrolyzing a glass raw material gas in flame to generate glass particles and depositing the glass particles on a rotating starting material in the radial direction using a burner with a concentric multiple-tube structure having at least a plurality of small diameter combustion assisting gas-ejecting ports having the same focal length. L 1 is made greater than L 2 (L 1 > L 2) during an early stage of deposition and L 2 is increased in the cource of the deposition so that L 2 is greater than L 1 (L 1 < L 2), where the focal length is denoted by L 1 and the distance from the tip of the burner to a deposition plane on the starting material is denoted by L 2.

Description

technical field [0001] The present invention relates to a method of making an optical fiber preform by hydrolyzing a glass feedstock gas in a flame to produce glass beads and depositing the glass beads on a spinning starting material. Background technique [0002] So far, various methods for manufacturing optical fiber preforms have been proposed. Among these methods, an Outside Vapor Phase Deposition Method (OVD method) is widely used. In this method, while the burner or the rotating growth material is relatively reciprocated, glass beads generated by the flame of the burner are deposited and attached to the rotation growth material, thereby synthesizing a porous preform. The preforms are dehydrated and sintered in an electric furnace. The above-mentioned method is widely used because it can provide an optical fiber preform having a relatively arbitrary refractive index distribution and can mass-produce a preform having a large diameter. [0003] figure 1 An outline of ...

Claims

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Application Information

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IPC IPC(8): C03B37/018
CPCC03B2207/06C03B2207/14C03B2207/12C03B2207/20C03B37/0142Y02P40/57C03B37/00C03B37/012C03B37/018C03B37/028
Inventor 吉田真
Owner SHIN ETSU CHEM IND CO LTD