Optical fibre preforms

Details Optical fibre preforms Optical fibre preforms

C - Chemistry, Metallurgy

03

B

C03B 37/012 (2006.01)

Patent

CA 2154369

A method of manufacturing a preform for drawing into an optical fibre comprises positioning a rod 10 within a sleeving tube 42 therefor to form an assembly in which there is an annular space 26 between the rod and tube, and collapsing the tube onto the rod to form a solid cross-section preform. The collapsing step comprises sealingly closing the annular space 26 at one end 30 of the assembly and applying suction to the annular space from the other end of the assembly. The annular space 26 at said one end 30 is sealingly closed by locating the end 28 of the tube at said one end on an annular rib 22 of said rod and fusing said tube end to said rib.

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