摘要
采用分步傅里叶算法,在基元脉冲数分别为9、17和25及相邻基元脉冲时间间隔分别为1、2及3的情况下,对短间隔脉冲串在光纤负色散区的非线性传输特性进行数值研究.研究结果表明,尽管脉冲数、脉冲位置、脉冲强度和相邻两脉冲间的时间间隔随距离变化,且在传输过程中弱脉冲基座会扩展到很宽的时间范围,但是整个主脉冲波包始终保持局域即其时间间隔几乎不变,展宽速度不明显.同时,主脉冲波包永不重复前面的轮廓,即波包演化出现混沌行为.短间隔脉冲串的非线性演化可以形成混沌孤子波包,基元脉冲间的时间间隔及脉冲串的脉冲数都会影响混沌孤子波包的子脉冲数和它的持续时间.
The nonlinear propagation characteristic of the short-interval pulse trains in the anomalousdispersion regions of optical fibers was investigated numerically by adopting spilt-step tourmr atgorlmm for time intervals between two adjacent elementary pulses respectively being 1, 2, and 3, and number of elementary pulses being 9, 17, and 25. The results indicate that, although the pulse number, pulse position, pulse intensities, and the time interval between two adjacent pulses, may vary with distance, and although the weak pulse pedestal may extend to very wide temporal range during propagation, the whole main wavepacket all along maintains localized with their temporal duration being nearly unchanged instead of broadening obviously and rapidly. What is more, the main pulse wavepacket never repeats its previous profile, which means that the wavepacket evolution exhibits chaotic behavior. Thus, in this sense, the nonlinear evolution of short-interval pulse trains can cause the chaotic soliton wavepacket generation. Both the elementary pulse time interval and pulse number of the pulse trains affect the chaotic soliton wavepacket in terms of its sub-pulse number and especially its temporal duration.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2016年第5期128-137,共10页
Acta Photonica Sinica
基金
The Key Project of Science and Technology of the Ministry of Education(No.210186)
the Major Project of Natural Science Supported by the Educational Department of Sichuan Province(Nos.13ZA0081
12ZB09)
关键词
混沌孤子波包
短间距脉冲串
非线性传输特性
混沌
孤子
Chaotic soliton wavepackets
Short-interval pulse trains
Nonlinear propagation characteristics
Chaotic
Soliton
