RT Journal Article T1 Propagation-induced transition from slow to fast light in highly doped erbium fibers A1 Gómez Calderón, Óscar A1 Melle Hernández, Sonia A1 Antón Revilla, Miguel Ángel A1 Carreño Sánchez, Fernando A1 Arrieta Yáñez, Francisco A1 Cabrera Granado, Eduardo AB 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. PB American Physical Society SN 1050-2947 YR 2008 FD 2008-11-10 LK https://hdl.handle.net/20.500.14352/52223 UL https://hdl.handle.net/20.500.14352/52223 LA eng NO ©2008 The American Physical Society NO Ministerio de Educación y Cultura de España (MEC) NO Universidad Complutense de Madrid (España) NO Banco Santander Central Hispano (BSCH( (España) NO Comunidad de Madrid (España) DS Docta Complutense RD 18 jul 2024