Highly Efficient Fast Light Generation in a Tellurite Fiber Embedded in Brillouin Laser Ring Cavity

Highly efficient fast light propagation of optical pulse at negative group velocity was demonstrated in a single-mode tellurite fiber embedded in a Brillouin laser ring cavity. A maximum advancement of 385 ns and an average time advancement per unit power of 3.77 ns/mW were observed when the cavity was pumped with a 1-MHz sinusoidal wave signal at a power level of 102 mW. Pump loss of 7.9 dB was also monitored at the maximum fast light generation, showing an average slope efficiency of 48.7 ns/dB.