偏振模色散影响色散控制孤子传输的理论研究

采用变分法分析高速色散控制孤子在双折射光纤中的传输规律。首先建立了色散控制孤子在双折射光纤中的扰动传输模型 ,然后解析了偏振模色散影响下色散控制孤子各参量的传输演化规律 ,最后对解析结果进行了计算。研究结果表明 ,偏振模色散参量对色散控制孤子能量、脉宽的演化影响很大 ,当偏振模色散很大时 ,如Dp>0 .3ps/km1/ 2 时 ,必须考虑采用某些在线控制手段来有效抑制偏振模色散对传输系统的影响 ,然而 ,当Dp≤ 0 .1ps/km1/ 2 时 ,系统几乎不受影响 ,同时本文还证明了色散控制孤子抗偏振模色散扰动的能力强的这一特点。为研究偏振模色散对高速非线性传输系统、特别是色散控制孤子传输系统的影响提供了理论依据和研究方法。

A Study of the Influence of Polarization Mode Dispersion in Dispersion-Managed Soliton Transmission Systems

The rule of dispersion-managed soliton transmission in birefringent fiber is analyzed by variational method. Firstly,The model of perturbed soliton transmission in birefringent fiber is built, and then the rule of transmission evolvement of the DMS parameters influenced by PMD is analyzed, at the last, the analysis results are numerical computed. The results indicate that the parameter of PMD has a great impact on the energy and width of DMS evolution. While the PMD is big like as the Dp>0.3 ps/km1/2, the some of online control methods must be used to restrain the PMD effects on this transmission system, but if Dp≤0.1 ps/km1/2, the transmission system can hardly be effected by PMD. The results also prove that the DMS possess a characteristic of robustness to PMD. These results provide the theoretical evidence and research way for studying influence of PMD in systems of high-speed nonlinear pulse transmission, particularly in DMS system transmission.