%0 Journal Article
%A Gómez Calderón, Óscar
%A Melle Hernández, Sonia
%A Antón Revilla, Miguel Ángel
%A Carreño Sánchez, Fernando
%A Arrieta Yáñez, Francisco
%A Cabrera Granado, Eduardo
%T Propagation-induced transition from slow to fast light in highly doped erbium fibers
%D 2008
%@ 1050-2947
%U https://hdl.handle.net/20.500.14352/52223
%X We analyze the propagation regime of an amplitude-modulated 1536 nm  signal when traveling along a highly doped erbium fiber pumped at 977 nm  as a function of the fiber length. A propagation-induced transition from superluminal to subluminal propagation takes place along the fiber length which allows a change in regime solely based upon increasing the signal modulation frequency. This peculiar behavior is due to the interplay between pump absorption and pump-power broadening of the spectral hole induced by coherent population oscillations. The effect of ion density on this frequency-dependent regime change has been investigated.
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