Optical glass fibres and method of forming such fibres

Details Optical glass fibres and method of forming such fibres Optical glass fibres and method of forming such fibres

1981-01-16

1982-08-17

Fisher, Richard V.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

65 315, 65 31, 350 9634, 501 54, 501 64, C03B 37075, C03C 110, C03C 302, C03C 304

Patent

active

043450369

ABSTRACT:
In optical glass fibres formed of high-silica glass which is susceptible to the production of color centers on drawing into fibres, the attenuation due to such drawing-induced color centers is suppressed or reduced by incorporating from 1 to 100 (preferably 3 to 50) parts per million of cerium oxide in the glass from which the fibre is drawn, under oxidizing conditions such that a significant proportion of the cerium is in the form of ceric ions and the total attenuation is not more than 20 dB/Km in the wavelength range from 800 to 900 nm. The invention is applicable to the known process in which a batch of glass-forming materials is melted to form a phase-separable silicate glass and a rod is drawn or cast from the glass, which is then phase-separated and leached to form a porous rod; the rod is stuffed with a dopant which increases the refractive index; the dopant is dissolved out from an outer region of the rod, which is collapsed by heating to produce a pre-form of a high silica glass with an inner region of higher refractive index; and optical fibre is drawn from the pre-form. In this process, a cerium compound may be introduced into the batch, the melting and the drawing or casting of the rod then being carried out under oxidizing conditions, or a cerium compound may be introduced with the dopant into the porous rod.

REFERENCES:
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patent: 2958604 (1960-11-01), George
patent: 3499775 (1970-03-01), Albinak et al.
patent: 3528829 (1970-09-01), Baak et al.
patent: 4110093 (1978-08-01), Macedo et al.
Evans et al., "Radiation Resistant Fiber Optic Materials . . .", IEEE Transactions on Nuclear Science, Dec. 1975, vol. NS-22, No. 6, pp. 2462-2467.
Kaiser, "Drawing-Induced Coloration in Vitreous Silica Fibers", J. Am. Optical Soc., Apr. 1974, vol. 64, No. 4, pp. 475-481.

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