Abstract
The loss characteristics of hollow-core, oxide-glass-cladding, middle infrared (near 1000 cm−1) optical waveguide is calculated numerically for TE01, TM01, and HE11 modes. The oxide-glass cladding used has its refractive index nr less than unity; their transmission losses of the waveguide are relatively small due to total reflection effect. The necessity condition of complex refractive index nr -ik of the cladding is clarified to be used with such hollow-core optical waveguides.

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