Process for producing preforms for optical fibers

Details Process for producing preforms for optical fibers Process for producing preforms for optical fibers

1988-10-24

1991-03-19

Lacey, David I.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 32, C03C 2502

Patent

active

050007734

ABSTRACT:
A hollow silica bar is formed on a mandrel by an external deposition method using a plasma torch. The mandrel is removed and on the inner face of the bar is deposited a vitreous coating to be used for the subsequent formation of the core of the fibers. Deposition is obtained by means of a plasma column, formed in the bar as a result of an ultra-high frequency coupler able to inject a travelling surface wave into the plasma column.

REFERENCES:
patent: 4049940 (1977-09-01), Moisan et al.
patent: 4292063 (1981-09-01), Abe
patent: 4402720 (1983-09-01), Edahiro et al.
patent: 4414488 (1983-11-01), Hoffmann et al.
patent: 4666488 (1987-05-01), Mizutani et al.
patent: 4675040 (1987-06-01), Tanaka et al.
M. Moisan et al., Production and Applications of Microwave Surface Wave Plasma at Atmospheric Pressure, Journal of Microwave Power, 14(1), 1979, pp. 57-61.
M. Moisan et al., A. Waveguide-Based Launcher to Sustain Long Plasma Columns Through the Propagation of an Electromagnetic Surface Wave, IEEE Transactions on Plasma Science, vol. PS-12, No. 3, 9/84, pp. 203-213.

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