Abstract
Negative group velocity superluminal propagation has been experimentally investigated based on stimulated Brillouin scattering in a 10-m highly nonlinear fiber (HNLF) ring cavity. The advancement of 365.8 ns with a high average slope efficiency of 118.9 ns/mw versus the output lasing power was observed. The maximum negative group velocity of −0.105c and the minimum group index of −9.499 have been achieved by using the HNLF with high Brillouin gain coefficient and the optimized 1/99 coupler ratio in the cavity. The tunability of negative group velocity and group index can be easily controlled by the input pump power and optical coupler ratio indicating potential applications for a highly advanced sensing scheme based on Brillouin oscillation superluminal propagation.
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