Process for the manufacture of optical fibers with a radial refr

Details Process for the manufacture of optical fibers with a radial refr Process for the manufacture of optical fibers with a radial refr

1977-10-14

1979-08-21

Bashore, S. Leon

Glass manufacturing

Processes

Forming product or preform from molten glass

65 30R, 65 31, 65 33, 65DIG7, C03B 3700, C03C 1500, C03B 3200

Patent

active

041652223

ABSTRACT:
A process yielding a glass blank in the form of a rod intended for drawing an optical fiber of the kind of self-focussing fiber i.e. having a radial refractive index gradient, having features (substantially transparency or transmission efficiency) lower than those of the fibers intended for long distance communication but sufficient for middle distance transmission, and which exhibits a lower cost than known processes. In a first stage a phase separation yields a "hard" phase (rich in silicon) and a "soft" phase (poor in silicon and rich in impurities) due to the drawing of a rod from a bath of molten glass through a cooling system having a strong temperature gradient and creating a radial refractive index gradient. In a second stage the soft phase is leached, eliminating the impurities contained in the soft phase but keeping safe the radial gradient. In a third stage a consolidation treatment is a pure annealing treatment rendering the hard phase more homogeneous.

REFERENCES:
patent: 3758284 (1973-09-01), Haller
patent: 3870399 (1975-03-01), Randall et al.
patent: 3881945 (1975-05-01), Trojer et al.
patent: 3929497 (1975-12-01), Munks
patent: 3938974 (1976-02-01), Macedo et al.
patent: 4060401 (1977-11-01), Maries et al.
patent: 4061486 (1977-12-01), Jahn
patent: 4097258 (1978-06-01), Horikawa et al.

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