Dynamical analysis of Brillouin fiber lasers: An experimental approach

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Abstract
We study experimentally and numerically the influence of the fiber length on the stability of Brillouin lasers in both ring cavity and Fabry-Pérot configurations. For short enough fibers, experiments and numerical simulations show that the Brillouin emission is stable for any input pump power. This behavior, in contrast with that previously observed on long fibers, is interpreted within the framework of a modal analysis. Further experiments, involving a sweeping of pump frequency, emphasize the role of the frequency detunings, which was generally overlooked.

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