This paper presents the results of experimental and theoretical studies of the optical characteristics of fibers made from silicate glasses with coatings in the form of a polycrystalline film or nanoparticles of vanadium dioxide in the wavelength range 0.8-1.8 μm. It is shown that the variation of the optical properties of the coating with temperature causes efficient attenuation modulation of the optical signal in the fiber. The modulation depth in fibers with a nanocomposite coating is a factor of 3-4 times greater than in fibers with a thin-film coating. This is because plasma resonance is present in nanoparticles of vanadium dioxide in the metallic phase.
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