不同剖面DDF中啁啾高斯脉冲展宽的研究

Study on chirped Gaussian pulse broadening in dispersion-decreasing fibers with different profiles

文章从理论上推导了啁啾高斯脉冲在5种不同群色散剖面光纤中的传播特性和初始啁啾对脉宽的影响。与常规单模光纤(SMF)相比,这5种色散缓变光纤(DDF)中的脉冲展宽较慢,能有效抑制脉冲展宽,但这5种DDF之间也存在着较大的差异。初始啁啾对脉冲的影响体现在:当2βc>0时,脉冲展宽速度比无啁啾时要快;当2βc<0时,脉冲有一初始窄化过程,之后又快速展宽。

The propagation characteristics of chirped Gaussian pulses in fibers with 5 different group dispersion profiles are the- oretically deduced and the effects of the initial chirps on the pulse width discussed. Compared with conventional Single Mode Fibers（SMF）, the pulse broadening in these five Dispersion-Decreasing Fibers （DDF） is effectively restrained to be slow with fairly big differences among themselves. As for the effects of the initial chirps on the pulses, when β2c 〉 0, the pulse broadening is faster than that without chirps, while whenβ2c〈0, the pulses are fast broadened after an initial process of narrowing.