超高斯啁啾光脉冲在单模光纤中传输的演化行为

本文从激光脉冲在单模光纤中传输所满足的非线性薛定谔方程出发,通过分步傅里叶变换方法,数值研究了超高斯啁啾光脉冲在单模光纤中脉冲形状的演化.研究表明,超高斯脉冲在单模光纤中传输将经历一个从近平顶、多峰、最后到单峰的演变过程,且高阶色散将引起脉冲形状发生畸变;在GVD和SPM效应的共同作用下,无啁啾的超高斯脉冲在特定条件下将出现孤子演变,具有正啁啾的超高斯脉冲在传输的初始阶段,脉冲形状的变化非常剧烈,而由于负初始啁啾减弱了非线性与色散效应引起的频率啁啾,所以其脉冲波形的变化平缓一些.研究表明,SPM产生的啁啾对入射脉冲的初始啁啾有一定的补偿作用.

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

Based on the nonlinear Schrodinger equation,the evolution of chirped super-Ganssian optical pulse propagating in the single-mode fiber has been investigated numerically by split-step Fourier method.The results show that super-Gaussian pulse's shape undergoes a variation from near-rectangular, multi-peak,and finally to single-peak,and the shape of pulse deform when high-order dispersion is considered.On the effects of GVD and SPM,super- Gaussian pulse which has no chirp becomes soliton at given conditions,and the shape of which has positive chh-p deforms extremely at beginning of propagation, but gently for which has negative chirp.Furthermore,chirp caused by SPM compensates the initial chirp of input pulse in some degree.