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利用光脉冲在高双折射非线性光纤中传播时所遵守的相干耦合非线性薛定谔方程,研究了单一频率的线偏振光,当偏振方向沿两个双折射轴的分量强度相等时,其在阶跃式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,调制不稳定性这一过程不仅产生在反常色散区,而且产生在正常色散区,对于阶跃式光纤,矢量调制不稳定性还随级数不同发生变化。并且,反常色散区产生的增益谱不同于正常色散区,较之多一个增益谱区域。
Using the coherently coupled nonlinear Schrödinger equation which is observed when the light pulse propagates in a high birefringence nonlinear optical fiber, the linearly polarized light of a single frequency is studied. When the components of the polarization direction along the two birefringence axes are equal in intensity, Modulation Instability Caused by Abnormal Dispersion and Normal Dispersion in Aberrant Optical Fiber. The results show that the instability of modulation occurs not only in the anomalous dispersion region but also in the normal dispersion region. For the step fiber, the instability of vector modulation also varies with the order of magnitude. Also, the gain spectrum produced by the anomalous dispersion area is different from the normal dispersion area by one more gain spectrum.