Abstract

We report an enhanced scheme to achieve superluminal propagation at negative group velocity in optical fibers with a hybrid Brillouin lasing cavity. The hybrid cavity was constructed by introducing a pumped erbium-doped fiber to enhance the Brillouin lasing. Experimental results show that with the assistance of a hybrid cavity, the threshold power of the Brillouin lasing was reduced from 758.7 to 235.7 mW, and the time advancement was promoted to 444.4 ns after passing through 2 m highly nonlinear fiber at a modulation frequency of 1 MHz, corresponding to a group index of $-44.6$ and group velocity of $-0.0224c$. Moreover, a maximum negative group index of $-21,029$ was observed at the modulation frequency of 1 kHz, which, to the best of our knowledge, is the highest negative group index ever reported in optical fibers via stimulated Brillouin scattering.

© 2019 Optical Society of America

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