非线性高双折射色散缓变光纤中矢量调制不稳定性

Vector Modulation Instability of Nonlinear High Birefringent Dispersion Decreasing Fiber

利用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,研究了在偏振方向沿两个双折射轴的分量强度相等时,色散缓变光纤中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,随传输距离的增加调制功率区域加宽,对应不同的功率区域输入脉冲有不同的增益谱,并且当输入脉冲功率一定时,随传输距离的增加导致增益谱表现出明显的不同。

The coherently coupled nonlinear Schrdinger (NLS)equation of the propagation of a light pulse in a fiber has been utilized.Modulation instability of linearly polarized light in a nonlinear birefringent dispersiondecreasing fiber has been studied not only in anomalous dispersion regime but also in normal dispersion regime when the intensities along the two birefringence axes are equal.The results show that the input pulses have different gain spectra obviously when modulation power regime broadening with propagation distance,both in anomalous dispersion regime and in normal dispersion regime.Furthermore,the gain spectra is different for different propagation distance when power of input pulse is invariable.