五次非线性效应对高斯脉冲和孤子啁啾演变影响的研究

从理论上推导出包含五次非线性系数的高斯脉冲和孤子的啁啾表达式.发现不论是高斯脉冲还是孤子,五次非线性效应对啁啾的影响与脉冲的初始啁啾、光纤的损耗系数、入射光场的峰值功率和脉冲传输距离等诸多因素有关.在其他参数给定的情况下,分别考虑了五次非线性效应对高斯脉冲和孤子啁啾的影响特性,并做了简单的比较.结果表明,高斯脉冲和孤子啁啾的演变特性极为相似.选择合适的五次非线性系数的光纤,并与其他参数相匹配,可以在高斯脉冲和孤子中心附近相当宽的区域内出现净啁啾等于零或近似等于零的现象.

The effect of quintic nonlinearity on evolution of the chirp of the Gaussian pulse and soliton

An analytic expression of the chirp of the Gaussian pulse and soliton including the effect of quintic nonlinearity was derived. As an example of the Gaussian pulse and soliton, the effect of quintic nonlinearity on the chirp was found to depend on the initial chirp, the fiber loss, and the peak power of the light field. Given other certain parmeters, the effect of quintic nonlinearity on the chirp of the Gaussian pulse and soliton was considered and compared. The result showed that the effect on the chirp of the Gaussian pulse and soliton was similar, and the effect of quintic nonlinearity which would make the quite wide net chirp equal could be zero or be approximately zero in the central region of the pulse when the fiber with reasonably quintic nonlinearity was chosen.