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We investigate the generation of phonon wavepackets in optical fibers viaelectrostriction from coherent optical waves. Solving the elastodynamicequation subject to the electrostrictive force, we are able to reproduceexperimental spectra found in standard and photonic crystal fibers. We discussthe two important practical cases of forward interaction, dominated by elasticresonances of the fiber, and backward interaction, for which an efficientmechanism of phonon guidance by light is found. The latter result describes theformation of the coherent phonon wavepacket involved in stimulated Brillouinscattering.

Electrostriction and guidance of sound by light in optical fibers