光纤横向色散的不均匀性对高斯脉冲传播的影响

本文基于高斯脉冲在光纤中传输时,考虑光纤色散效应(二阶、三阶)在空间有横向分布不均匀时的影响.推导出无啁啾的高斯型脉冲在光纤中传输时的解析表达式.并对理论结果进行了数值模拟,分析了脉冲产生畸变的影响因素.结果表明,由于材料的不均匀而导致的色散在空间横向不均匀对脉冲传播有很大的影响,高斯脉冲在光纤中传输时波形在横向呈对称性分布,二阶色散和三阶色散相互比较,三阶色散效应对脉冲的传输有严重的影响,在脉冲的一沿形成非对称的拖尾振荡结构,图像畸变严重性分布.随着传输距离的增加畸变也欲加严重.

THE IMPACT OF OPTICAL FIBER LATERAL DISPERSION INHOMOGENEITY TO GAUSSIAN PULSE PROPAGATION

Based on the Gaussian pulse propagating in the optical fiber,considering the impact of optical fiber dispersion(second-order dispersion & third-order dispersion) on the lateral inhomogeneity in the space,the analytic expression of the non-chorp Gaussian pulse transmitting is deduced in the optical fiber,the theory result is carried by the numerical value simulation,and the factors causing the pulse distortion are analyzed.The results show that the lateral inhomogeneity of dispersion in the space has an important effect on pulse propagation because of the inhomogeneity of material,the waveform distributes symmetrically on the lateral when Gaussian pulse transmits in the optical fiber.Compared with second-order dispersion,the third-order dispersion swans notable role on the pulse transmission is characteristic.The asymmetrical trailing vibration structure is formed in the first border in the pulse and the image is distorted seriously and the distortion distributes symmetrically.The distortion will be aggravated as the transmitting distance increasing.Above all researches on the influence of the optical fiber inhomogeneity distribution on pulse propagation are very important.