Numerical Simulation of 980 nm-LD-Pumped Yb³⁺-Er³⁺-Tm³⁺-Codoped Fiber Amplifier for 1500 nm and 1600 nm Bands

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.

(a)

(b)

(c)