The influence of mechanical vibrations on the optical transmission of infrared fibers of AgCl0.25Br0.75 and AgCl0.5Br0.5 within 30 hours was investigated. It was demonstrated, that vibration effects on the fibers leads to decrease of their transmittance. The selective character of infrared fiber transmission in wavelength ranges 2.0–4.0 μm and 6.0–9.0 μm was found.