Fused-silica-core glass fiber as a low-loss optical waveguide

A new type of glass fiber is discussed. The core of the fiber is pure fused silica, and the cladding is a high-silica-content glass. This type of glass fiber has potentially the lowest attenuation of light propagation. A light attenuation of approximately 20 dB/km was measured at a 632.8-nm wavelength in the preliminary work.