【摘要】 依据拉曼效应下光子晶体光纤所满足的非线性相干耦合薛定谔方程,在两偏振方向输入不同频率激光脉冲时,导出了增益的表达式。通过数值模拟,其结果表明与不考虑拉曼效应时相比,增益谱的对称性遭到破坏。当两偏振模同处于正常色散区和反常色散区时高阶色散的增加会造成增益谱展宽,峰值降低。而当两偏振模处于不同的色散区时,高阶色散的影响并不明显。同时模拟结果表明两偏振模的色散系数主要对斯托克斯部分和反斯托克斯部分的增益谱产生影响。更多还原

【Abstract】 The expression of gains is derived from the coherently coupled nonlinear Schrdinger(NLS)equation in consideration of Raman effect when two laser pulses with different wavelengths are emitted into birefringent photonic crystal fiber along two polarization axes.The result shows the symmetry of gain spectrum is damaged compared with no consideration of Raman effect by numerical simulation.The gain spectrum is broaden and gain peak is reduced with higher-order dispersion increasing when two polarization modes are in the normal dispersion and anomalous dispersion regions.The gain spectrum is not obvious influenced by the higher-order dispersion when two polarization modes are in different dispersion regions.The result also shows that the two polarization mode dispersion coefficients majorly impact on Stokes and anti-Stokes of the gain spectrum,respectively.更多还原