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Process and apparatus for elongating an optical fibre preform

A treatment process and preform technology, applied in glass manufacturing equipment, manufacturing tools, etc., can solve the problem of inability to accurately control the final diameter of the preform

Inactive Publication Date: 2009-10-21
PRYSMIAN CAVI E SISTEMI ENERGIA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The applicant found that, for these reasons, the measurement of the neck diameter at pre-fixed points, which are not related to the neck geometry, does not allow precise control of the final diameter of the preform

Method used

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  • Process and apparatus for elongating an optical fibre preform
  • Process and apparatus for elongating an optical fibre preform
  • Process and apparatus for elongating an optical fibre preform

Examples

Experimental program
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Embodiment Construction

[0057] Referring now to the accompanying drawings, figure 1 A very simplified schematic diagram of an optical fiber preform drawing apparatus is drawn according to one embodiment of the present invention.

[0058] The stretching apparatus, always referenced at 101, comprises a horizontal lathe 105 having a stationary mandrel 107a and a movable mandrel 107b divided in the horizontal direction. First and second ends 109a and 109b of glass preform 109 are attached to stationary and movable mandrels 107a and 107b, respectively. To this end, the first and second preform ends 109a and 109b may be provided with a conventional wrench (not shown). The preform 109 is thereby elongated between the stationary and movable mandrels 107a and 107b, with the longitudinal axis 109c of the preform being substantially in a horizontal plane when elongated.

[0059] There is a movable trolley 111, which can move along the direction of the preform shaft 109c on a horizontal plane. The trolley 111...

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PUM

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Abstract

A process and apparatus for drawing an optical fiber preform comprising: heating the preform to soften a region thereof; drawing the preform to stretch it; during the drawing step, at least one measuring point along the preform above, determining the diameter of the preform; and controlling the stretching step based on the determined diameter. In the stretching step, at least one geometric parameter of the preform is measured, and the position of the diameter measurement point is controlled according to the measured geometric parameter. The measurement of at least one geometric parameter of the preform includes determining the contour of at least a portion of the softened region, such as an image of the contour of the neck region.

Description

technical field [0001] This invention relates generally to the fabrication of optical fibers and, more particularly, to the formation of glass preforms for use in optical fibers. In particular, the present invention relates to processes and apparatus for drawing optical fiber preforms. Background technique [0002] Various processes are known for making glass preforms for drawing optical fibers. These processes include modified chemical vapor deposition (MCVD) processes, external vapor deposition (OVD) processes, and vapor axial deposition (VAD) processes. [0003] Many known preform-making processes include a stage called drawing, in which, according to different techniques related to the particular fabrication process, a vitreous preform rod is formed and undergoes diameter shrinkage to obtain a defined final diameter preforms. For this purpose, the glass preform is heated up to softening temperature in a furnace or by means of a torch. The preform rod is then stretche...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B37/012C03B37/07
CPCC03B37/01242C03B37/0124
Inventor 安东尼奥·米莱奥马尔科·鲁齐尔
Owner PRYSMIAN CAVI E SISTEMI ENERGIA
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