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We present a study of optical modulation by the effect of temperature-induced insulator-to-metal phase transition of vanadium dioxide (VO_2) nanocrystals deposited in an antiresonance hollow-core fiber (AR-HCF). We fabricate such a VO_2-coated fiber by embedding alkylsilane functionalized VO_2 nanocrystals into the air holes of an AR-HCF. With this fiber, we achieve an optical loss modulation of ∼60% at a temperature above ∼53^∘C over an ultrabroad spectral range that encompasses the S+C+L band.