强双折射光纤中单一频率传输区域的调制不稳定性

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,研究了单一频率的线偏振光,且偏振方向沿两个双折射轴的分量强度相等时,在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,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,双折射性质变化导致增益谱表现出明显的不同.

Modulation Instability of Single Frequency Propagation Regime in Strong Birefringence Fibers

The coherently coupled nonlinear Schrdinger (NLS) equation of the propagation of a light pulse in a fiber has been utilized .we have studied modulation instability of linearly polarized light with single frequency 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 input power regime is different , both in anomalous dispersion regime and in normal dispersion regime. Furthermore, the gain spectra is different for different intrinsic birefringence when power of input pulse is invariable.