Optical fibre manufacture

Details Optical fibre manufacture Optical fibre manufacture

C - Chemistry, Metallurgy

03

B

49/8

C03B 23/04 (2006.01) C03B 37/018 (2006.01) C03B 37/02 (2006.01)

Patent

CA 1097503

J. Irven-A.P. Harrison 12-2 (Revision) METHOD OF MANUFACTURING OPTICAL FIBRE PREFORMS ABSTRACT OF THE DISCLOSURE In the manufacture of silica optical fibers a tube having an internal coating of a volatile dopant is locally heated by a hot zone repeatedly traversed along its length to promote shrinkage and finally collapse of the tube bore. During the shrinkage prior to the final collapse traversal a gas flow of oxygen and a halide of the volatile dopant is maintained through the tube in order firstly to provide a small overpressure to ensure circularity in the shrinkage and secondly to compensate for the tendency for dopant to be lost by volatilization.

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