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We report the superluminal phenomenon of both Stokes and pump light instimulated Brillouin scattering (SBS) via an optical-fiber ring lasingresonator. In our experiment, the superluminal generation of Stokes lightfirstly delayed with 33.79 ns and then propagated with the advancement of 93.34ns within an 8-m single mode fiber (SMF), when the pump power increased fromthe SBS threshold to a higher power. This proves the first evidence that theoptical interaction is determined by the group velocity even at the negativegroup velocity superluminal propagation. It is important that, this implies thepossibility of superluminal information interchange because the results alsoindicate that the signal conversion between different wavelengths can berealized at the negative group velocity propagation.

Superluminal signal conversion in stimulated Brillouin scattering via an optical fiber ring resonator