Process and apparatus for on-line dehydrogenation of fiber-drawi

Details Process and apparatus for on-line dehydrogenation of fiber-drawi Process and apparatus for on-line dehydrogenation of fiber-drawi

1982-06-21

1984-05-01

Fisher, Richard V.

Glass manufacturing

Processes

Forming product or preform from molten glass

65157, 6537412, C03B 3707

Patent

active

044459181

ABSTRACT:
Vapor deposition of doped silica in a reaction chamber on a rotating supporting surface, in the manufacture of a preform for the drawing of an optical fiber, is accompanied by the continuous admixture of deuterium with a flow of carrier gas, specifically oxygen, by which the reactants are transported to the reaction chamber. An isotopic substitution of deuterium for the hydrogen of hydroxyl groups in the reaction products shifts the major absorption peaks to wavelengths outside the minimum-attenuation range of 0.7 to 1.6.mu. used for fiber-optical signaling. The proper ratio of deuterium to carrier gas is maintained with the aid of a mixer having two compartments separated by a perforated diaphragm or a thin metallic foil, one compartment being connected to a deuterium tank while the other communicates with a conduit through which the vapors entrained by the carrier gas pass to the reaction chamber.

REFERENCES:
patent: 3791714 (1974-02-01), Maurer
patent: 3826560 (1974-07-01), Schultz
patent: 3865647 (1975-02-01), Reuschel
Kato et al, "Isotopic Chemical Vapor Deposition . . . ", Applied Optics, vol. 16, No. 6, Jun. 1977, pp. 1453-1454.

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