We examine data from a stimulated Brillouin scattering experiment with very small feedback (＜＜1%), from a single-mode optical fiber with a CW YAG laser, and find evidence of Coherence Resonance. For low laser pump levels, the signal is stochastic in nature, as shown by analysis with local dispersion and surrogate data. As the pump level increases, a periodic signal emerges, corresponding to the round trip time of light in the fiber; at higher pump levels this periodic signal is lost, and the data once again becomes stochastic. These findings raise fundamental issues on the emergence of deterministic signals from seemingly stochastic behaviour in nonlinear optical interactions.
展开▼
