Patent ID: 7908888
Filing Date: 2011-03-22
Classification: C03B,Y02P

Abstract:
1. A process for producing a glass core preform for a low-attenuation optical fiber, the process comprising: producing a soot core preform by chemical deposition on a substrate; removing the substrate from the soot core preform, thereby forming a central hole along the soot preform; drying and consolidating the soot core preform in a furnace to form said glass core preform; and stretching the glass core preform; wherein the step of drying and consolidating comprises reducing the diameter of the central hole without extracting the glass core preform from the furnace, wherein the step of stretching comprises closing the central hole, wherein the diameter of the central hole at the end of the drying and consolidating step is about 0.05 mm to about 0.40 mm.