Nuño Javier, Gilles Marin, Guasoni Massimiliano, Kibler Bertrand, Finot Christophe, Fatome Julien
Opt Lett. 2016 Mar 15;41(6):1110-3. doi: 10.1364/OL.41.001110.
We theoretically and experimentally investigate the design of a high-repetition rate source delivering well-separated optical pulses due to the nonlinear compression of a dual-frequency beat signal within a cavity-less normally dispersive fiber-based setup. This system is well described by a set of two coupled nonlinear Schrödinger equations for which the traditional normally dispersive defocusing regime is turned in a focusing temporal lens through a degenerated cross-phase modulation process (XPM). More precisely, the temporal compression of the initial beating is performed by the combined effects of normal dispersion and XPM-induced nonlinear phase shift provided by an intense beat signal on its weak out-of-phase replica co-propagating with orthogonal polarizations. This adiabatic reshaping process allows us to experimentally demonstrate the generation of a 40 GHz well-separated 3.3 ps pulse train at 1550 nm in a 5 km long normally dispersive fiber.
我们通过理论和实验研究了一种高重复率光源的设计，该光源由于在无腔正常色散光纤装置内对双频拍频信号进行非线性压缩而产生间隔良好的光脉冲。该系统可以用一组两个耦合的非线性薛定谔方程很好地描述，对于这组方程，传统的正常色散散焦机制通过简并交叉相位调制过程（XPM）转变为聚焦时间透镜。更确切地说，初始拍频的时间压缩是由正常色散和由强拍频信号在与其共传播的正交偏振的弱异相副本上提供的XPM诱导的非线性相移的综合作用来实现的。这种绝热重塑过程使我们能够在实验中证明在5公里长的正常色散光纤中产生了1550纳米处间隔良好的40吉赫兹、3.3皮秒的脉冲序列。
