Abstract
We report a change from sub- to superluminal propagation upon increasing the modulation frequency of an amplitude-modulated signal when propagating through highly doped erbium fibers pumped at . We show that the interplay between the pump absorption and the pump-power broadening of the spectral hole induced by coherent population oscillations may drastically affect the fractional advancement or delay of the signal for the considered fibers.
© 2008 Optical Society of America
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