Patent ID: 6072930
Filing Date: 2000-06-06
Classification: B29C,C03B,C03C,G02B,G02F

Abstract:
A method of forming an optical fiber from a preform having a glass core surrounded by an outer glass cladding with a coating of a particulate optically active material between said core and cladding, said method comprising:(a) providing preform having a glass core having a viscosity which lies within a given preselected temperature range with a particulate coating of an optically active material over the surface of said core with said coating material having flow properties which is equal to or less than the viscosity of said glass core; and a glass cladding over said coated layer, with said glass having a similar viscosity which overlaps the viscosity of the glass core material and thermal coefficient of expansion compatible with that of the core; and(b) drawing a fiber from the preform of (a).