双折射光纤中三阶色散对孤子脉冲传输的影响

Effect of Third-Order Dispersion on the Soliton Propagation in Birefringent Optical Fiber

研究了孤子脉冲在双折射光纤零色散点附近的传输特性 ,应用数值分析方法 ,讨论了在双折射光纤中 ,三阶色散对孤子脉冲传输的影响。在输入脉冲两个偏振分量强度相等的情况下 ,分析发现孤子捕获条件没有变化 ,但是 ,脉冲一个偏振分量迅速展宽 ,另一偏振分量展宽变慢。同时 ,脉冲的形状、光谱在两个偏振分量中都呈现出不对称性。在一定的条件下 ,孤子的辐射波主要集中在一个偏振分量中。

Propagation of short pulses in the birefringent single-mode fiber near the zero-dispersion wavelength is discussed. Initial pulses are assumed to be linearly polarized at π/4 angle with respect to the polarization axes. With numerical method,it is found that the third-order dispersion,as a small perturbation,does not affect the threshold of the soliton trapping. But,pulse width of one polarization broadens quickly;another broadens slowly. Meanwhile the shapes and the spectra of the pulses,are not any longer symmetric in the two polarizations. Under the certain condition,the radiation of the soliton is dominantly in one polarization.