On the Temperature-Dependent Gain and Noise Figure Analysis of C-Band High-Concentration EDFAs With the Effect of Cooperative Upconversion

The Influence of Nonlinear Effects Upon Oscillation Regimes of Erbium-Doped Fiber Lasers

“…Formula (21) is a worthy approximation for fitting of the whole of experimental near-IR fluorescence decay kinetics, reported above for P p ∼400 mW (providing maximal population of manifold 4 I 13/2 ). The modeling results obtained by using formula (22) are shown by plain curves in Figure 12 (the fitting procedure has been fulfilled until the residual sum R 2 exceeded 0.99) and are seen to be in good agreement with the experimental decay kinetics (points in the figure). The values of constants τ 0 (lifetime of single Er 3+ ions, found to be ~10.8 ms for all the fibers under study), and C HUP (an attribute of the HUC process, determined as the result of fitting) are plotted in Figure 15 in function of the small signal absorption α 0 at 978 nm.…”

“…Refs. [22][23][24]. Note that the quantity attributing the HUC phenomenon ( C HUP * constant) should be proportional to the ESA cross-section (see e.g.…”

“…Normalized fluorescence decay kinetics obtained for the EDFs of L-(a) and M-(b) series; points -experimental data (using InGaAs-PD with Si filtering); plain curves are the theoretical fits made using formula(22).…”

“…The values of HUC constant C HUP vs. Er 3+ concentration (in terms of α 0 at 978 nm), obtained for the entire set of EDFs as the result of modeling of the experimental fluorescence kinetic using formula(22); the fitting line in for guiding the eye.…”

Simulation approach for the design of radiation-hardened Erbium doped fiber amplifiers

“…High output power, or to maintain little-changing output power over long term space task is very significant. On the ground, a certain higher gain and lower noise figure could be reached by high doping concentration of erbium, thus the length of fiber could be shortened [1] , then the radiation induced loss weakened, however, higher-doped technology such as adding other materials, would lower the erbium fiber mechanical strength by quenching effect [2] . Some showed higher doped erbium fiber by adding more aluminum to reach high gain, which could cause Aluminum-induced RIA [3] .…”