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US 4,728,350 AGranted
Process and apparatus for producing optical-fiber preforms for mid-infrared range fibers
AssigneeCSELT - Centro Studi e Laboratori Telecommunicazioni S.p.A.
InventorGiuseppe Cocito
Life of this patent
Estimating the term…
Abstract
The process employs solid-state halides heated at high temperature, under pressure conditions necessary to their vaporization, and obtains their condensation to a solid state on the internal surface of a glass tube, which, after collapsing, forms the preform.
Claims20
A method of making an optical preform capable of being drawn into an optical fiber for operation in a mid-infrared spectral range, said method comprising the steps of:
- heating one or more halides to an elevated temperature at a controlled pressure to transform the halides to vapor and conducting vapors of the halides without condensation into the interior of a cooled tube;
- directing said vapors against an inner wall of said tube whereby said vapors directly condense on said wall to a solid state deposit;
- and
- removing nonhalide-based portions of said tube to yield said preform with at least said deposit being adapted to be drawn to form said optical fiber.
1 more element
An apparatus for making an optical preform capable of being drawn into an optical fiber for operation in a mid-infrared spectral range, said apparatus comprising:
- means for heating one or more halides to an elevated temperature at a controlled pressure to transform the halides to vapor;
- a conduit connected to said means for heating for conducting vapors of the halides without condensation into the interior of a cooled tube;
- and
- a nozzle at an end of said conduit in said tube for directing said vapors against an inner wall of said tube whereby said vapors directly condense on said wall to a solid state deposit whereby by removing nonhalide-based portions of said tube said preform is obtained with at least said deposit being adapted to be drawn to form said optical fiber.
1 more element
Dependencies are inferred from the claim text.