ABSTRACT

Semiconductors for which bandgaps correspond to a long wavelength spectral region (1 to 1.6 µm) are important for optical fiber communication using silica fibers exhibiting extremely low loss and low dispersion, infrared imaging, and lightwave sensing. Semiconductor crystals for 1 to 1.6-µm wavelength emission. Ternary or quaternary semiconductor crystals are used since binary semiconductor crystals with 1 to 1.6-µm bandgaps are not available. The binaries in the parentheses indicate the substrates to be used. Crystal growth of these materials is possible with a lattice mismatch ±0.1% or less. luoride glass fibers have found use in long-distance optical communication in the 2- to 4-µm wavelength range. Signal loss in fluoride glass fibers is predicted to be one or two orders of magnitude lower than that for silica fibers. In the MOCVD method, gas sources are used for growth of the structures.