Abstract
A review of this new field of materials and optics science is presented. Two kinds of materials are used for the fiber fabrication: glasses and crystalline or polycrystalline compounds. Metallic halides and chalcogenides in a glassy or crystalline state are the most promising candidates because of their low attenuation and large transparency band. Fibers operating in the CO 2 laser emitting region close to 10.6 μm are of particular interest; KRS 5 fibers have the best attenuations. Fluoride glass fibers have induced a lot of investigations because of their predicted ultralow loss, <10 −2−10 −3 dB km . Applications for long repeaterless communications and short-length power transmission are discussed.
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