RT Journal Article T1 Effect of ion concentration on slow light propagation in highly doped erbium fibers A1 Melle Hernández, Sonia A1 Gómez Calderón, Óscar A1 Carreño Sánchez, Fernando A1 Cabrera Granado, Eduardo A1 Antón Revilla, Miguel Ángel A1 Jarabo Lallana, Sebastián AB The effect of ion density on slow light propagation enabled by coherent population oscillations has been experimentally investigated for highly doped erbium fibers at room temperature. We found that fractional delay increases with ion density. A saturation effect in the fractional delay has been observed for doping levels above ∼3150 ppm. Ultra-high ion concentration can simultaneously increase the fractional delay and the bandwidth of the signals. We have studied the propagation of Gaussian pulses along the fibers obtaining fractional delays up to 0.7 for the highest doping levels used. It is shown that pulse power can be used as a control parameter to reduce distortion at different pulse bandwidths. PB Elsevier Science BV SN 0030-4018 YR 2007 FD 2007-11-01 LK https://hdl.handle.net/20.500.14352/52221 UL https://hdl.handle.net/20.500.14352/52221 LA eng NO Received 4 August 2006, Revised 28 June 2007, Accepted 30 June 2007, Available online 19 July 2007. NO Ministerio de Educación y Cultura de España (MEC) NO Universidad Complutense de Madrid (España) NO Comunidad de Madrid (España) NO Banco Santander Central Hispano (BSCH) (España) DS Docta Complutense RD 20 abr 2025