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Modulation-frequency-controlled change from sub- to superluminal regime in highly doped erbium fibers

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Abstract

We report a change from sub- to superluminal propagation upon increasing the modulation frequency of an amplitude-modulated 1550nm signal when propagating through highly doped erbium fibers pumped at 980nm. 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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