%0 Journal Article
%A Melle Hernández, Sonia
%A Gómez Calderón, Óscar
%A Caro, César E.
%A Cabrera Granado, Eduardo
%A Antón Revilla, Miguel Ángel
%A Carreño Sánchez, Fernando
%T Modulation-frequency-controlled change from sub- to superluminal regime in highly doped erbium fibers
%D 2008
%@ 0146-9592
%U https://hdl.handle.net/20.500.14352/52222
%X We report a change from sub- to superluminal propagation upon increasing the modulation frequency of an amplitude-modulated 1550 nm signal when propagating through highly doped erbium fibers pumped at 980 nm. 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.
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