This paper reviews progress in the nascent field of glass-clad semiconductor core optical fibers. This new class of optical fibers may significantly advance the fields of nonlinear fiber optics and infrared power delivery. They also provide considerable insight into the fundamentals of crystal growth and the interplay between thermodynamics and kinetics under non-equilibrium conditions. More specifically, this paper discusses the processing and properties of crystalline unary (silicon and germanium) and binary (indium antimonide) semiconductor optical fibers prepared by a molten core approach that enables long lengths at relatively high speeds by comparison to other fabrication methods.
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