Gómez Calderón, ÓscarMelle Hernández, SoniaAntón Revilla, Miguel ÁngelCarreño Sánchez, FernandoArrieta Yáñez, FranciscoCabrera Granado, Eduardo2023-06-202023-06-202008-11-101050-294710.1103/PhysRevA.78.053812https://hdl.handle.net/20.500.14352/52223©2008 The American Physical SocietyWe 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.engjournal articlehttps://doi.org/10.1103/PhysRevA.78.053812https://journals.aps.org/pra/abstract/10.1103/PhysRevA.78.053812open access535.57621.391.6535.31LightDoped erbium fibersNonlinear opticsPropagation signalÓptica (Física)Fibras y comunicación ópticaÓptica no líneal2209.19 Óptica Física2209.5 Fibras ópticas2209.13 Óptica no lineal