The authors M. Taalbi and T. K. Ishii have found that when a He-Ne laser light is fed to optically transparent glass rods and optical fibers, where an acoustic wave is applied normal to the light beam, the lightwave is modulated by the acoustic wave. The acoustic signal is generated by a piezoelectric transducer, operating in the audio range, with power levels about 1 mW. The detected light contains the fundamental frequency of the modulation signal, with various degrees of phase-shift, frequency doubling and tripling, depending on the location of observation. The lightwave power transmission coefficients are found maximum near the cross-polarization condition, although the light transmission through the samples become minimum at or near the cross-polarization condition. Also, these coefficients are found to be modulation frequency dependent, with values exceeding one, at near cross-polarization. The authors assume that pseudo-amplification has occurred at the previously stated conditions. Theoretical explanation, and models of the observed phenomena have been developed by the authors.