Patent ID: 6574994
Filing Date: 2003-06-10
Classification: C03B

Abstract:
A method of manufacturing a multi-segment optical fiber preform, comprising the steps of:forming a cylindrically-shaped core soot region by an OVD method by depositing silica-containing soot onto an outside radial surface of a rotating mandrel, removing the mandrel, consolidating the core soot region in a consolidation furnace thereby forming a consolidated core blank, drawing from the consolidated core blank at least one core cane segment having an outer dimension do wherein all portions of the at least one core cane are up-doped, forming a sleeve on an inside of a tube wherein the sleeve includes at least one down-doped radial portion on an inner radial portion of the sleeve and at least one radial up-doped portion on an outer radial portion of the sleeve, inserting the core cane segment into the sleeve, and collapsing the sleeve around the core cane segment to form a core-sleeve assembly.