Process for the production of graded index optical fibres

Details Process for the production of graded index optical fibres Process for the production of graded index optical fibres

1979-05-29

1981-02-10

Lindsay, Jr., Robert L.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 3A, 65 31, 65 33, C03B 3700, C03C 1500, C03B 3200

Patent

active

042499240

ABSTRACT:
A process for the manufacture of a glass blank in the form of a rod from which the optical fibre is drawn, said blank being produced starting from a molten bath of glass. A first stage of the process comprises melting a mixture of starting materials having a higher impurity content (<10.sup.-4) in the form of so-called transition metals then the final blank (<10.sup.-7). A second stage consists in inducing separation into two solid phases (a hard phase rich in silica and a soft phase poor in silica) by drawing the blank from the bath of molten glass and by subsequently subjecting it to a thermal annealing treatment. This is followed by deep etching and by peripheral etching to eliminate the soft phase and its impurities to different extents as a function of depth, which creates a radial refractive index gradient and an optical cladding.

REFERENCES:
patent: 4097258 (1978-06-01), Horikawa et al.
patent: 4165222 (1979-08-01), Panafieu et al.

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