Process for producing preforms for optical fibres and...

Details Process for producing preforms for optical fibres and... Process for producing preforms for optical fibres and...

C - Chemistry, Metallurgy

03

B

204/96.31

C03B 37/018 (2006.01) C03B 37/012 (2006.01) C03B 37/014 (2006.01)

Patent

CA 1319904

ABSTRACT OF THE DISCLOSURE To carry out the process for producing preforms for optical fibres, 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 fibres. 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 ground wave into the plasma column. These process and mandrel can be applied to the production of monomode optical fibres.

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