超高斯光脉冲在单模光纤中的传输特性

Transmission characteristics of super-Gaussian optical pulse in the single-mode optical fiber

从光脉冲在光纤中传输演变所满足的基本方程出发 ,研究了超高斯光脉冲在普通单模光纤中的传输特性。数值模拟的结果表明 ,超高斯光脉冲入射后脉冲波形、瞬时啁啾以及峰值强度的演变规律与高斯脉冲入射时不同 ,脉冲波形不再总保持单峰结构 ,通常将经历一个从近平顶、多峰、最后到单峰的演变过程 ;从脉冲的前沿到后沿 ,瞬时啁啾也不再为线性 ,而是具有多个极值 ;峰值强度随传输距离的变化趋势也不再为单调递减 ,而是先增加后减小。这些变化规律还与入射超高斯脉冲的边沿陡峭程度和初始频率啁啾有关。

Based on the propagation equation used to describe the normalized amplitude evolution in the fiber,the evolution of super-Gaussian optical pulse propagating in the single-mode fiber has been investigated numerically. The results show that for an incident super-Gaussian pulse with steep edges,the evolution of its shape,frequency chirp,and peak intensity are different from those for an incident Gaussian pulse. Its shape undergoes a variation from near-rectangular,multi-peak,and finally to single-peak;its frequency chirp is not linear;and its peak intensity increases at first,then passing a maximum,and finally decreases monotonously. And these evolutions relate to the shape and frequency chirp of the incident super-Gaussian optical pulse.