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Device for making optical fiber powder-deposit and method for making powder-deposit using said device optical-fiber

A manufacturing device and technology for accumulating powder, which can be used in combustion methods, manufacturing tools, glass manufacturing equipment, etc., and can solve problems such as increased interference and deformation of core accumulated powder.

Inactive Publication Date: 2003-01-08
FURUKAWA ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the interference between the flame of the side burner and the flame of the cladding burner increases, and the core powder is deformed in the worst case

Method used

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  • Device for making optical fiber powder-deposit and method for making powder-deposit using said device optical-fiber
  • Device for making optical fiber powder-deposit and method for making powder-deposit using said device optical-fiber
  • Device for making optical fiber powder-deposit and method for making powder-deposit using said device optical-fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] According to the VAD method, using figure 1 The core powder production test of the basic structure shown by figure 2 or image 3 The burners are used as side burners. exist figure 2 In the case of a conventional burner (where the burner outer diameter (width) D is 0.5d, where d is the diameter of the core portion), the cross-sections of nine of the 10 cores obtained by PA Measuring is not possible because of oversized slots. Furthermore, in the core whose profile could be measured, air bubbles appeared along the entire length of the obtained core.

[0042] On the other hand, when using the image 3 In the case of the shown rectangular burner, when using a multi-tube burner with a width increased to 0.7d, no air bubbles were found and profile measurements could be performed. Example 2 :

Embodiment 2

[0043] Then, tests were carried out with respect to the length V of the tapered end portion, as figure 1 shown. defined by conventional burners (see figure 2 ) The length of the tapered end portion of the powder product produced is V 0 . when using figure 2 When the position of the cladding burner is moved upward, the length of the tapered end portion of the product becomes longer, 1.7V 0 . Therefore, positioning image 3 The rectangular side burner is such that the width with greater length is in the horizontal direction, and the width L of this burner is fixed at 0.7d. Synthesis was performed using a rectangular side burner by varying the height H of the burner according to two levels (eg 0.5d and 0.3d). As a result, the length of the tapered portion of the final product powder can be shortened, and V 0 and 0.7V 0 . The formation of air bubbles was not found, and the measurement of the profile could be performed. This relationship is Figure 4 shown in .

[00...

Embodiment 3

[0046] An embodiment using the burner cover of Fig. 8(a) and Fig. 8(b) is described below. Figure 9 is a graph illustrating the relationship between the height h of the shroud and the length V of the tapered portion of the end portion of the powder-cored body when the height h is varied while the height H of the burner is constant. from Figure 9 It is evident that the length V of the tapered portion of the end portion of the powder-cored body can be reduced by reducing the height of the outlet of the hood. This method is economical because the length (V) of the tapered portion of the end portion of the core powder body can be controlled by exchanging the burner cover. In addition, if the height h of the hood outlet is 0.5H or more with respect to the height H of the burner, the hood end portion can be used in a normal state without being burned.

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PUM

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Abstract

The invention discloses an apparatus for manufacturing an optical fiber soot (fiber parent material) according to a VAD method, in which a cross-section shape of a combustion nozzle of a side burner for heating a core portion is rectangular. A method for manufacturing an optical fiber soot using the apparatus.

Description

technical field [0001] The invention relates to a method for manufacturing optical fiber soot (optical fiber soot). The present invention also relates to a device for manufacturing optical fiber product powder (optical fiber base material). Background technique [0002] The Vapor Axial Deposition method (VAD method) consists of a step in which a part of the core and cladding of an optical fiber (hereinafter referred to as the core cladding) is deposited in the axial direction by glass formed in an oxyhydrogen flame. synthesized from particles. The deposits synthesized by this method are called core soot. The drawing of the obtained soot body in the axial direction was carried out so that the position of the tip portion of the soot body and the distance between the core burner remained constant. The speed at which the accumulated powder is drawn is called the growth speed. The device used according to this method is in figure 1 is schematically illus...

Claims

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Application Information

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IPC IPC(8): C03B37/018C03B37/014F23D14/22F23D14/56F23D14/84
CPCC03B2207/54F23D14/22C03B37/0148F23D14/84F23D14/56F23C2900/9901Y02P40/57
Inventor 有马洁桑原正英户田贞行
Owner FURUKAWA ELECTRIC CO LTD
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