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首页> 外文期刊>Optics Communications: A Journal Devoted to the Rapid Publication of Short Contributions in the Field of Optics and Interaction of Light with Matter >Numerical simulation of solitons switching and propagating in asymmetric directional couplers
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Numerical simulation of solitons switching and propagating in asymmetric directional couplers

机译：非对称定向耦合器中孤子切换和传播的数值模拟

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摘要

A numerical investigation, based on the use of split step Fourier transformation algorithm, of all-optical solitons switching in asymmetric directional couplers is presented. The numerical algorithm is described in details. The analysis highlights the influence of the different effective mode area, the phase- and group-velocity mismatch, the different dispersion between two cores on the switching and propagation of short pulses. The investigation indicates that the phase velocity mismatch and the different effective mode area can reduce the coupling length while the different group velocity and the different dispersion between two cores do not change the coupling length. We have also found that the increase of effective mode area ratio can lead to an increase of the switching threshold power but improve significantly the switching steepness, the increase of the phase velocity mismatch can cause a decrease of the switching threshold power but degrade the switching steepness, the increase of the ratio of dispersion can result in a decrease of the switching threshold power and vary the switching steepness, the increase of group velocity mismatch can give rise to an increase of the switching threshold power but improve obviously the switching steepness. Furthermore, the group velocity mismatch can induce solitons pulse to walk off or stretch in the asymmetric directional coupler.
机译：基于分步傅立叶变换算法，对非对称定向耦合器中的全光孤子切换进行了数值研究。详细描述了数值算法。分析强调了不同有效模式区域，相速度和组速度失配，两个磁芯之间的不同色散对短脉冲的切换和传播的影响。研究表明，相速度失配和有效模式面积的不同可以减小耦合长度，而两个铁心之间的不同的群速度和不同的色散不会改变耦合长度。我们还发现，有效模式面积比的增加会导致开关阈值功率的增加，但会显着改善开关陡度;相速度失配的增加会导致开关阈值功率的减小，但会降低开关陡度，色散比的增加会导致开关阈值功率的减小并改变开关陡度，群速度失配的增加会引起开关阈值功率的增大，但开关陡度明显提高。此外，群速度失配会导致孤子脉冲在非对称定向耦合器中走开或伸展。

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