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利用二能级Giles模型来计算掺铒光纤增益,并通过琼斯矩阵描述偏振控制器,提出了一种基于非线性薛定谔方程的非线性偏振旋转锁模光纤激光器的数值模型。该模型具有物理意义更加清晰、便于分析泵浦功率对锁模影响的优点。采用1.0 m长的掺铒光纤、5.8 m长的单模光纤和85:15的输出耦合器,当泵浦功率为25 mW时数值计算得到均方根宽度为0.30 ps的超短脉冲。研究了泵浦功率对锁模脉冲波形和光谱的影响,并讨论了泵浦功率与掺铒光纤中增益分布的关系。通过实验得到了锁模脉冲,其光谱形状与仿真得到的结果相似。测量了不同泵浦功率下脉冲的平均功率,变化趋势也与理论值吻合。
A two-level Giles model is used to calculate the gain of erbium-doped fiber. The Jones matrix matrix is used to describe the polarization controller. A nonlinear polarization rotation mode-locked fiber laser based on the nonlinear Schrödinger equation is proposed. The model has a clearer physical meaning and facilitates the analysis of the advantages of pump power on the mode-locking effect. Using a 1.0 m long erbium-doped fiber, a 5.8 m long single-mode fiber, and an 85:15 output coupler, an ultra-short pulse with root mean square width of 0.30 ps was numerically calculated at a pump power of 25 mW. The effect of pump power on the mode-locked pulse waveform and the spectrum is studied. The relationship between pump power and gain distribution in erbium-doped fiber is also discussed. The mode-locked pulses were obtained experimentally and their spectral shapes were similar to those obtained by simulation. The average power of the pulse at different pump powers was measured and the trend of change coincided with the theoretical value.