摘要
提出一种在单模光纤负群速色散区由弱脉冲产生高强度超短光孤子的新方法．即让波长位于光纤负色散区的弱脉冲和波长位于光纤正常色散区的强泵浦脉冲在光纤中共同传输，在光纤的零色散波长位于弱脉冲波长和泵浦脉冲波长中间附近的情况下，拉曼放大与脉冲压缩的共同作用能使弱脉冲演化成若干个比其初始宽度窄得多的高强度基本孤子．计算机模拟表明，泵浦脉冲愈强，由弱脉冲产生的基本孤子数目愈多、宽度愈窄、峰值功率愈高、而且所需的光纤愈短．进一步研究表明，即使在泵浦脉冲和弱脉冲具有不同的初始宽度、或两者的群速度存在一定差异的情况下，上述产生超短光孤子的方法仍然有效．
A novel method that can lead to generation of intense ultrashort optical solitons from weak pulses in the anomalous dispersion regime of single mode fibers is proposed. It consists of copropagating a weak pulse with an intense pump pulse in an optical fiber whose minimum dispersion wavelength is chosen such that it falls between the pump and the signal wavelength. The interplay between Raman amplification and pulse compression induces the week pulse to evolve into several fundamental solitons whose widths are much narrower than those of pump pulse and initial signal pulse. Numerical simulations show that, the higher the pump power is, the narrower and more intense the generated soliton is, and a shorter fiber is used. It is also shown that the method remains applicable even for different initial widths and for a small walk off between the pump and the signal pulses. Finally, the mechanism for fundamental soliton generation and its application in optical soliton communication system are discussed.
出处
《光学学报》
EI
CAS
CSCD
北大核心
1999年第3期374-381,共8页
Acta Optica Sinica
基金
广东省自然(青年)科学基金
