Compositions: coating or plastic – Coating or plastic compositions – Alkali metal silicate containing
Patent
1979-01-29
1980-03-25
McCarthy, Helen M.
Compositions: coating or plastic
Coating or plastic compositions
Alkali metal silicate containing
65 3A, 65 7, 106 47Q, 106 50, 106 52, 106 53, 106 54, 350 9633, 350 9634, G02B 514
Patent
active
041948076
ABSTRACT:
The present invention discloses an optical fiber wave-guide for signal transmission in which the signal fiber has a linear thermal expansion co-efficient in all of the fiber elements above 15.times.10.sup.-7 /.degree.C. in which the outer mantle is composed of the silicon dioxide modified glass, and the optical fiber wave-guide is composed of an inner silicon dioxide-free mantle employing germanium oxide and other components and has an inner silicon dioxide-free core which is composed of germanium oxide and optionally other additives. The fiber is produced according to the chemical vapor deposition process, and preferably has a refractive index gradient which has the shape of a parabola.
REFERENCES:
patent: 3614197 (1971-10-01), Nishizawa et al.
patent: 3884550 (1975-05-01), Maurer
patent: 4025156 (1977-05-01), Gloge et al.
patent: 4094689 (1978-06-01), van Ass et al.
patent: 4106850 (1978-08-01), Marcatili
patent: 4114980 (1978-09-01), Asam et al.
Presby, H. M. et al.--"Material Structure of Germanium-Doped Optical Fibers and Preforms, " Bell System Tech. Journal--Dec. 1975, pp. 1681-1692.
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