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| Measured pulse delay and advancement experienced by a light pulse propagating through a 2 m fibre for different gain or loss induced by stimulated Brillouin scattering. The inset compares the respective positions on a distance scale of the pulse propagating in normal conditions and of the most advanced pulse, demonstrating that in this case the pulse peak exits the fibre before entering it. This situation corresponds to a negative group velocity. The fibre length is represented by the shaded area. |
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