]>Numerical Simulation of 980 nm-LD-Pumped Yb<sup>3+</sup>-Er<sup>3+</sup>-Tm<sup>3+</sup>-Codoped Fiber Amplifier for 1500 nm and 1600 nm Bands : Figure 3
278105.fig.003a
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278105.fig.003b
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278105.fig.003c
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Figure 3: Variation of the gain spectra with Er3+ ion concentration (a), Tm3+ ion concentration (b), and Yb3+ ion concentration (c). Fiber length, pump power, and input signal power are 1.5 m, 980 nm, 200 mW, − 30 dBm, respectively.