Melle Hernández, SoniaGómez Calderón, ÓscarZhuo, Zhong C.Antón Revilla, Miguel ÁngelCarreño Sánchez, Fernando2023-06-202023-06-202011-06-070740-322410.1364/JOSAB.28.001631https://hdl.handle.net/20.500.14352/44626© 2011 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.The efficiency of the dynamic population gratings recorded in highly doped erbium fibers has been studied. We find that the grating response increases with optical density, although the presence of erbium ion pairs in fibers with ion density of the order of 6:3 × 1025 m−3 degrades the grating efficiency. The experimental results have been reproduced including inhomogeneous upconversion processes in the nonlinear coupled-wave equations.engjournal articlehttp://dx.doi.org/10.1364/JOSAB.28.001631https://www.osapublishing.org/josab/abstract.cfm?uri=josab-28-7-1631&origin=searchrestricted access535.345535.57Fiber Optics and Optical CommunicationsFiberserbiumNonlinear opticsÓptica (Física)2209.19 Óptica Física