Characteristics of erbium-doped fiber amplifiers relevant for applications in optical communications are reviewed. Special attention is given to the relationship of saturation power to pump power the dependence of saturation characteristics on host glass erbium-doped fiber amplifiers with reduced pump requirements and a comparison of pumping at 980 nm and 1. 48 tm.
John L. Zyskind, John L. Zyskind,
"Advances in Erbium-doped fiber amplifiers for optical communications", Proc. SPIE 1373, Fiber Laser Sources and Amplifiers II, (1 January 1991); doi: 10.1117/12.24931; https://doi.org/10.1117/12.24931