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US 4,155,733 AGranted
Optical fibre manufacture
AssigneeInternational Standard Electric Corporation
InventorsCarl P. Sandbank, John Irven
Life of this patent
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Abstract
A continuous flow process is disclosed in which optical fibre is made by a method involving the chemical vapor deposition of material upon the bore of a tube. The tube is fabricated from an annular crucible around a vertical gas feed and is lowered through a hot zone where it is softened and drawn into fibre. The gas deposits one or more layers on the inside of the tube prior to drawing so as to provide the drawn fibre with optical waveguide properties.
Claims13
A method of optical fibre manufacture, comprising the steps of:
- fabricating a glass tube around a vertical gas feed;
- lowering the glass tube through a hot zone where it is softened and its bore collapsed;
- drawing the collapsed tube into an optical fibre;
- and
- discharging vapor deposition reagents into the glass tube through the vertical gas feed in a zone above the region where the tube is collapsed, thereby depositing upon the bore one or more layers of reagents, the composition of which is chosen to provide the drawn fibre with optical waveguiding properties.
2 more elements
Dependencies are inferred from the claim text.