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提出了Er/Yb共掺的光纤放大器中,Yb离子仍然存在基态能级斯塔克(Stark)分裂的假设,考虑1060 nm波段辐射,利用速率方程和传输方程,结合Er/Yb共掺双包层光纤的吸收和发射系数谱,采用4阶龙格-库塔(Runge- Kutta)算法,建立了模拟Er/Yb共掺双包层光纤放大器放大自发辐射(ASE)光谱的理论模型。通过改变抽运功率和信号功率,对其前向放大自发辐射光谱特性进行了全面的分析。大信号入射时,改变抽运功率,只改变输出功率大小。输出光谱形状不变,而当信号功率足够小时,前向放大自发辐射光谱在1535 nm和1543 nm处会出现2个局部峰值,理论模拟与实验数据相符。
In Er / Yb co-doped optical fiber amplifier, the assumption that the ground state energy level Stark splitting still exists in Yb ions is considered. Taking into account the radiation in the 1060 nm band, the rate equations and transmission equations are used in combination with Er / Yb co- Based on the 4th order Runge-Kutta algorithm, a theoretical model for amplifying the spontaneous emission (ASE) spectra of Er / Yb co-doped double-clad fiber amplifiers is established. By changing the pumping power and signal power, the spectrum characteristics of its spontaneous emission amplified forward are analyzed comprehensively. Large signal incident, change the pumping power, only change the size of the output power. The shape of the output spectrum remains the same. When the signal power is small enough, there are two local peaks at 1535 nm and 1543 nm in the forward-amplified spontaneous emission spectrum. The theoretical simulation is consistent with the experimental data.