Step-index Si-Ge-core silica-cladded optical fibers

Abstract

Si-Ge alloy-core silica-cladded fibers were drawn at a low temperature to minimize impurity diffusion. The elemental segregation in the as-drawn fibers was overcome by a thermal treatment. The transmission losses of the fibers were calculated as 28 dB/cm at $6.1 \mu \mathrm{m}$ wavelength.