Method for producing optical fibers

Details Method for producing optical fibers Method for producing optical fibers

1985-05-23

1987-01-13

Lindsay, Robert

Glass manufacturing

Processes

Forming product or preform from molten glass

65 13, C03B 37023

Patent

active

046362355

ABSTRACT:
A process is disclosed for producing an optical fiber comprising forming a tubular glass body having at least one doped layer, at least one concentric layer, each layer having a different index of refraction, and a hollow center. The glass body is heated until the softening point is reached, and is then drawn into a glass fiber. During drawing, a partial vacuum is maintained in the hollow center of the tubular glass body, the partial vacuum being of sufficient magnitude to reduce the evaporation of doping material from the interior of the tubular glass body and thereby effectively prevent a reduction in the index of refraction in the center of the optical fiber.

REFERENCES:
patent: 4121919 (1978-10-01), Sergent et al.
patent: 4251251 (1981-02-01), Blankenship
patent: 4486214 (1984-12-01), Lynch et al.
patent: 4505729 (1985-03-01), Matsumura et al.
patent: 4551162 (1985-11-01), Hicks

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