【摘要】 利用光脉冲在非线性双折射光纤中传播时所遵守的相干耦合非线性薛定谔方程,研究了强双折射色散缓变光纤中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:在反常色散区对于任意的偏振角和任意输入功率的光脉冲都产生调制不稳定性,正常色散区存在着不稳定区域和稳定区域,对应不同的不稳定区域输入临界功率不同,脉冲有不同的增益谱。并且,给出了调制不稳定性增益谱随传输距离和偏振角的变化关系。更多还原

【Abstract】 The coherently coupled nonlinear Schrdinger equation of the propagation of a light pulse in a birefringence nonlinear fiber has been utilized.we have studied modulation instability in strongly birefringence dispersion decreasing fiber not only in anomalous dispersion regime but also in normal dispersion regime when the angel of the polarized direction and the birefringence axes is arbitrary.The results show that modulation instability can be produced when the angel of the polarized direction and the birefringence axes as well as input power is arbitrary in anomalous dispersion regime.There are both instability region and stability regionin normal dispersion regime.The input pulses have different gain spectra at instability region and input different power are different obviously.Gain spectra of the modulation instability as function of propagation distance and polarized angel has been given.更多还原