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Improvement of drawing waveguide preform

A technology of preforms and gobs, which is applied in glass forming, glass reshaping, light guiding, etc., can solve problems such as loss of core preform glass, and achieve the effect of improving utilization

Inactive Publication Date: 2000-05-03
CORNING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with the preform drawing process itself is the distance the starting glass gob must travel through the preform before the joined glass strands or rods can be clamped and a fully controlled draw can begin.
The result: a substantial portion (up to 25%) of the core preform glass is lost in gobs and drawn off-target diameter rods while making the required large diameter correction

Method used

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  • Improvement of drawing waveguide preform
  • Improvement of drawing waveguide preform
  • Improvement of drawing waveguide preform

Examples

Experimental program
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Effect test

Embodiment

[0034] Germanium-doped silica-based glass preforms were drawn into rods using a graphite induction furnace. The preform initially had a diameter of 76 mm. The drawn rods had a target diameter of 23 mm. The preform end was lowered into the furnace heating zone initially set at 1915°C. This temperature is empirically determined to be suitable for the preform. After gob formation, the furnace hot zone temperature was lowered to 1880°C and held constant as the gob fell through the furnace. No further temperature adjustment is required prior to gripping. Gob velocity measuring device including K-Karb R Plate and rod attached to a 0-300 gram load cell. The plate moves in the vertical direction using linear slides and motors. Plates, rods, load cells, linear slides, and motors were purchased from Lintech, Monmouth California. A pneumatic slide is provided to allow the assembly to leave the stretching line when the gob and trailing rod have come a sufficient gripping distance f...

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PUM

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Abstract

A gripper (16) grips an end of a preform (8) and pulls it down at a constant velocity as measured by a measurer (12). Since the preform (8) is heated by furnace (4), the preform stretches. This process creates an optical fiber preform rod of controlled diameter.

Description

Background of the invention [0001] The present invention relates to a method and apparatus for heating and stretching a glass preform to produce a glass rod having a uniform predetermined diameter while the deviation of the rod diameter is limited within a predetermined value. The new method and apparatus begins to control the diameter of the glass rod when a portion of the preform reaches a temperature at which the preform partially softens and begins to move downward under the force of gravity. [0002] An efficient method of making a drawn preform from which an optical waveguide fiber can be drawn involves first making a core preform. The core preform is heated and drawn into multiple core rods, which serve as bait rods for the deposition of the cladding glass. The performance of waveguide fibers depends largely on the geometric uniformity and size of the core and cladding glasses. Therefore, the geometry of the preform needs to be carefully controlled to ensure the prope...

Claims

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Application Information

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IPC IPC(8): G02B6/00C03B23/043C03B23/045C03B23/047C03B23/051C03B37/012
CPCC03B23/043C03B37/0124C03B23/047C03B23/045C03B23/051C03B37/025
Inventor P·R·布莱
Owner CORNING INC