Method of manufacturing a solid preform for drawing optical...

Details Method of manufacturing a solid preform for drawing optical... Method of manufacturing a solid preform for drawing optical...

C - Chemistry, Metallurgy

03

B

26/197

C03B 37/00 (2006.01) C03B 37/018 (2006.01) C03C 15/00 (2006.01)

Patent

CA 1236966

Abstract. Method of manufacturing a solid preform for drawing optical fibres. Upon closing the central duct in hollow preforms an etchant consisting of a mixture of oxygen and a fluorocarbon compound from the group C2F6, C3F8 and n-C4F10 is passed through the duct. In particular of the etchant is passed through the duct only when its diameter is 1 mm or smaller, it is possible to manufacture solid preforms and optical fibres therefrom without a central dip in the refractive index profile.

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