强双折射光纤中任意偏振方向矢量调制不稳定性

利用光脉冲在非线性双折射光纤中传播时所遵循的相干耦合非线性薛定谔方程,研究了偏振方向与双折射轴成任意角度时，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存在不稳定偏振区域和稳定偏振区域，对应不同的不稳定偏振区域，输入临界功率不同，脉冲有不同的增益谱. 关键词： 任意偏振方向 矢量调制不稳定性 非线性光纤 双折射

Vector modulation instability in an arbitrary polarized direction in strong birefringence fibers

The coherently coupled nonlinear Schrdinger equation of the propagation of a light pulse in a nonlinear birefringence fiber has been utilized.We have studied modulation instability not only in an anomalous dispersion regime but also in a normal dispersion regime when the angle between the polarized direction and the birefringence axes is arbitrary.The results show that the instability polarized region and stability polarized region exist not only in the anomalous dispersion regime but also in the normal dispersion regime. The input pulses have obviously different gain spectra when the instability polarized region and input different power are different.