Sodium borosilicate glasses for dielectric optical waveguides

Details Sodium borosilicate glasses for dielectric optical waveguides Sodium borosilicate glasses for dielectric optical waveguides

1975-04-25

1976-05-18

McCarthy, Helen M.

Compositions: coating or plastic

Coating or plastic compositions

Alkali metal silicate containing

65 32, 65134, 106 50, 106 54, 350 96WG, C03C 1300, G02B 514

Patent

active

039573427

ABSTRACT:
A particular range of glass compositions in the soda-boro-silicate glass system has been found to be particularly suitable for ultra-low loss dielectric optical waveguides. The composition range is indicated in FIG. 1 of the specification. By preparing such glasses in a reducing atmosphere (0-20% CO in CO.sub.2) and adding about 1% As.sub.2 O.sub.3 to the melt attenuation coefficients due to copper and iron can be minimised. The water content of the glass can be reduced by bubbling dry CO in CO.sub.2 through the molten glass. Glasses containing less than 30% Na.sub.2 O by weight have the lowest losses. Using glasses of this type dielectric optical waveguides having an insertion loss of less than 14 dBKm.sup.-.sup.1 have been made.

REFERENCES:
patent: 3020165 (1962-02-01), Davis
patent: 3531306 (1970-09-01), Dumbaugh
patent: 3779733 (1973-12-01), Janakirama-Rao
patent: 3791714 (1974-02-01), Maurer
patent: 3858964 (1975-01-01), Piesslinger et al.
patent: 3868170 (1975-02-01), DeLuca
patent: 3879207 (1975-04-01), Hartman
Newns, G. R. et al., "Low-Loss Glass for Optical Transmission" Electronics Letters, 10 (10) May 16, 1974.
Klyuev, V. P. et al., "Effect of Heat Treatment on the Viscosity of Sodium Silicate and Sodium Borosilicate Glasses" -- Chem. Abstracts 72 (1970) item 35192c, p. 279.
Weyl, W. A. -- Coloured Glasses--Pub. London (1959) pp. 101-120, 504-505.
Scott, B. et al. -- "Techniques for Producing Low Loss Glasses for Optical Fibre Communication Systems" -- Glass Technology 14 (5) Oct. 1973, pp. 114-124.

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