Optimization of Multiple Active Ion Doped Fiber Amplifiers for Three Communication Windows

Figure 2

Variation of the gain at 1310, 1470, 1530, 1600, 1650 nm with fiber length. Pump power, input signal power are 200 mW/200 mW, −30 dB m, respectively. The optimal concentration Pr³⁺=1.9×10²⁴, Tm³⁺=3.9×10²⁴, Er³⁺=1.2×10²⁴ ions/m³, and energy transfer coefficient Wet_6-3=63×10⁻²⁰, Wet_6-10=200×10⁻²².