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Method for manufacturing a glass fiber preform having a core with a polygonal core cross-section

A glass fiber, cross-section technology, applied in the field of glass fiber preforms, can solve the problems of incomplete transparency of glass layer melting, low surface temperature, unusable fibers, etc.

Active Publication Date: 2022-05-27
J FIBER GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In contrast, in the middle region of the rod face, the surface temperature is so low that the deposited glass layer melts and is not completely transparent
In these rod areas, air bubbles may appear later when the fiber is drawn, which renders the fiber unusable

Method used

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  • Method for manufacturing a glass fiber preform having a core with a polygonal core cross-section
  • Method for manufacturing a glass fiber preform having a core with a polygonal core cross-section
  • Method for manufacturing a glass fiber preform having a core with a polygonal core cross-section

Examples

Experimental program
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Embodiment Construction

[0042] figure 1 A cross-sectional representation of a mandrel with an exemplary polygonal mandrel cross-section is shown, the mandrel having an associated sandwich tube. The mandrel 1 has a polygonal core cross-section 2, which in the present case is of rectangular configuration. However, the polygonal core cross section need not necessarily be rectangular, in principle the number of corners and sides is arbitrary. In particular, a hexagonal or three-sided polygonal cross-section can also be provided, and the polygonal core cross-section can in particular also be pentagonal, as will be explained further below in further examples.

[0043] A mandrel with a rectangular polygonal cross-section penetrates here into the sandwich tube 3 . Here, the sandwich tube has been sectorized. according to figure 2 , the sandwich tube is made from an initial tube 4 with a tube cross-section 5 , which here is circular. The initial tube 4 is longitudinally cut and grooved along a series of...

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Abstract

The invention relates to a method for producing a glass fiber preform having a core with a polygonal core cross-section using the rod-in-tube process, the method having the following method steps: providing a core rod with a polygonal shape mandrel (1) of cross-section (2); manufacture of sectorized sandwich tube (3) from an initial tube (4) whose circumference is longitudinally grooved into a series of shell zones segments (8) such that the tube cross-section of the initial tube (4) is divided into a series of sectors (7); the mandrel (1) is penetrated and oriented to the sectorized sandwich tube ( 3); melting the sectorized sandwich tube (3) and possibly the outer sleeve (10) onto the sectorized sandwich tube (3), wherein the sectorized The individual shell sections (8) of the compartmentalized sandwich tube (3) are each fused to one of the corresponding sides (9) of the mandrel (1).

Description

technical field [0001] The present invention relates to a method for producing a glass fiber preform having a core with a polygonal core cross-section. The polygonal core cross section has, for example, a rectangular shape, but the polygonal core cross section can in principle also be configured as an arbitrary polygon. Background technique [0002] Glass fiber preforms with a polygonal core cross-section are glass rods with diameters in the centimeter range and lengths in the meter range. These glass rods are drawn in a fiber drawing station into polygonal core fibers, especially rectangular core fibers. The fiber diameter ultimately lies in the range of about 50 μm to about 500 μm. As in all optical fibers, there must be a sufficiently high refractive index difference between the fiber core and the surrounding fiber cladding to enable waveguides in the core region. Here, the refractive index in the core is higher than that in the surrounding cladding. [0003] At prese...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B37/012
CPCC03B37/01211C03B37/01228C03B37/01248C03B2203/12G02B6/02C03B37/01234
Inventor W·黑默勒J·克钦
Owner J FIBER GMBH