Rod-shaped preform for manufacturing an optical fiber therefrom, a method for manufacturing such a rod-shaped preform as well as a method for manufacturing an optical fiber, using such a rod-shaped preform
AssigneeDraka Fibre Technology B.V.
InventorsHenrikus Lambertus Maria Jensen, Marinus Jacob de Fouw
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Abstract
The present invention relates to a rod-shaped preform for manufacturing an optical fiber therefrom, as well as to a method for manufacturing such a rod-shaped preform. The present invention furthermore relates to a method for manufacturing an optical fiber, wherein one end of a rod-shaped preform is subjected to a heat treatment, after which the thus softened end of the rod-shaped preform is subjected to a pulling force for the purpose of drawing an optical fiber therefrom.
Claims9
A rod-shaped preform for manufacturing an optical fiber therefrom, characterized in that one end of a rod-shaped preform has a cone-like geometry, which cone-like geometry complies with the following equations:
- D d 0 = 2 - 25 , D d 1 2 = 1.2 - 5 , L C D = 0.8 - 3.5 and D > d 1 2 > d 0
- wherein
- LC=the cone length (mm)
- D=the diameter of the rod-shaped preform (mm)
- d0=the diameter of the rod-shaped preform at the cone end (mm)
- d1/2=the diameter of the rod-shaped preform halfway the cone (mm), and
- wherein the diameter of the cone near d0 is substantially constant for at least a portion of LC near d0.
An article of manufacture, comprising:
- a rod-shaped preform for producing an optical fiber therefrom, wherein one end of the rod-shaped preform has a cone having a cone-like geometry that continuously reduces in diameter along most of a length of the cone, which cone-like geometry complies with:
- D d 0 = 2 - 25 , D d 1 2 = 1.2 - 5 , L C D = 0.8 - 3.5 and D > d 1 2 > d 0
- wherein
- LC=cone length;
- D=diameter of the rod-shaped perform;
- d0=diameter of the rod-shaped preform at the cone end;
- d1/2=diameter of the rod-shaped preform halfway the cone;
- and
- wherein a diameter of the cone near d0 is substantially constant for at least a portion of LC near d0.
Dependencies are inferred from the claim text.