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Scattering in fibers: is there chaos?

The dynamics of stimulated Brillouin scattering (SBS) in single mode optical fibers is considered in the presence of arbitrary amounts of external feedback from the fiber ends. At high feedback levels the Stokes wave oscillates periodically with an intensity-dependent frequency. The irregular structure at very low feedback levels is found to be stochastic, not deterministically chaotic through analysis of the recorded time series.