Optical fiber with graded index core and pure silica cladding

摘要

An optical fiber having three dopants in the core of the fiber and a pure silicon dioxide cladding is disclosed. Phosphorus pentoxide and germanium dioxide are radially graded in the core of an optical fiber to obtain minimum modal dispersion over a broad range of wavelengths. A uniform concentration of boron oxide is present throughout the core of the fiber in order to permit a pure silicon dioxide cladding without encountering any step discontinuity in the index of refraction at the core-cladding interface.