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利用激光脉冲在光纤中传播时所遵守的相干非线性薛定谔耦合方程,研究了保偏光纤中两相近频率的线偏振光,其偏振方向相互正交且平行于光纤的双折射轴,且偏振方向沿两个双折射轴的分量强度相等时,在同为反常色散区和正常色散区所产生的调制不稳定性.结果表明在反常色散区和正常色散区都能产生调制不稳定性;在正常色散区存在不同的调制不稳定性功率区域,对应不同的功率区域,导致增益谱表现出明显的不同,并且当输入功率一定时,波长差(或频率差)的变化导致增益谱的变化.
By using the coherent nonlinear Schrodinger coupling equation that the laser pulses follow in propagating in optical fiber, the linearly polarized light near the two phases in the polarization-maintaining fiber is studied. The polarization directions are perpendicular to each other and parallel to the birefringence axis of the fiber, and the polarization direction Modulation instability in the same anomalous and normal dispersion regions results when the intensities of the components along the two birefringence axes are equal. The results show that modulation instability can occur both in the anomalous and normal dispersion regions; The dispersion region has different modulation instability power regions corresponding to different power regions, resulting in obvious difference of the gain spectrum. When the input power is constant, the variation of the wavelength difference (or frequency difference) leads to the change of the gain spectrum.