Guided acoustic‐wave Brillouin scattering (GAWBS) measurements were performed on 20‐cm lengths of optical fibers with particular attention focused on the lowest lying resonance. In 125‐μm‐diam silica fibers, this resonance was observed to occur at ~22 MHz and have a line shape which varied erratically from sample to sample. Significant line shape fluctuations were evident even between sequential samples from the same fiber spool. We speculate that the observed effects are attributable to 0.01-0.1 μm distributed geometric deviations from a perfect cylinder.
© 1994 American Institute of Physics
“Low-frequency lineshapes in guided acoustic-wave Brillouin scattering,” B. I. Greene and P. N. Saeta, Appl. Phys. Lett. 65, 2269 (1994).