Caustic ray use of the drawdown zone of an optical fiber preform

Details Caustic ray use of the drawdown zone of an optical fiber preform Caustic ray use of the drawdown zone of an optical fiber preform

1977-03-03

1978-07-25

Kellogg, Arthur D.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 13, 65 29, 65160, 356200, C03B 3702

Patent

active

041026616

ABSTRACT:
A technique for monitoring the drawdown zone of an optical fiber preform is disclosed. The technique involves detecting the caustic rays emanating from the drawdown zone. Analysis of these rays allows one to determine the geometric properties of both the drawdown zone and the resultant optical fiber. In addition, detailed information concerning the index of refraction distribution in the fiber may be obtained. The process is amenable to realtime applications during the drawing of an optical fiber.

REFERENCES:
patent: 3879128 (1975-04-01), Presby
patent: 3990873 (1976-11-01), Knetzlstorfer
Int. J. Solids Structures, vol. 12, 1976, "The Evolution of Caustics from Holes to Cracks", pp. 377-389, P.S. Theocaris.

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