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EPJ Techniques and Instrumentation
Figure 3 | EPJ Techniques and Instrumentation

Figure 3

From: Conception, modelling, and characterization of a fiber amplifier with a simple and easy-to-repair configuration intended for the use in harsh environments

Figure 3

Result of a numerical simulation with the parameters shown in Table 2. (a) Power of each beam (pump: \(P_{P}\), signal: \(P_{S}\), forward and backward ASE’s) at each position along the YDF. The pump and signal beams are injected at position 0 (with powers \(13~{\mathrm{W}}\) and \(0.2~{\mathrm{W}}\), respectively), and the signal is enhanced as the pump is absorbed. The power at the end of the fiber (position \(10~{\mathrm{m}}\)) is what is ejected. (b) Optical spectrum of the output beam, consisting of the depleted pump, enhanced signal, and the (forward) ASE. (c) Population inversion rate at each position along the YDF. (d) Time dependence of population inversion rate at fiber input. Broken line represents the steady-state solution with ASE disregarded

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