高功率掺镱双包层光纤放大器放大特性理论模拟
Numerical simulation of characteristics of high power ytterbium-doped double-clad fiber amplifier
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摘要: 运用掺镱双包层光纤放大器的理论模型，分析了连续和脉冲光放大时放大自发辐射(ASE)的计算方法。采用Runge-Kutta方法求解了考虑ASE稳态时掺镱双包层光纤放大器的放大特性，采用有限差分法求解了矩形、高斯和超高斯脉冲的放大特性。结果表明：用3 m长的双包层光纤、10 W的泵浦功率可以将脉宽3 ns、峰值功率为1 W的脉冲信号光峰值功率放大到15 kW左右；在饱和增益情况下，脉冲的波形变尖，宽度变窄；采用短的大模场双包层光纤和后向泵浦方式可以有效地降低ASE，并避免有害非线性效应。Abstract: The theoretical model of high-power ytterbium-doped double-clad fiber amplifier was described, and the method for calculating amplified spomtaneous emission(ASE) was analyzed, with the amplifier operating in CW regime and pulse regime. The characteristics of steady-state and pulse amplifiers were respectively simulated by Runge-Kutta method and finite-difference method. The results show that the pulse gets sharper and narrower on the condition of saturation gain, and utilizing double clad large mode fiber and backward pump scheme can reduce ASE and bad nonlinear effect dramatically.
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