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首页> 外文期刊>Optical and quantum electronics >Modulational instability in oppositely doubled-doped directed couplers with a non-kerr-like nonlinear refractive-index change
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Modulational instability in oppositely doubled-doped directed couplers with a non-kerr-like nonlinear refractive-index change

机译：具有非类kerr非线性折射率变化的相反双掺杂定向耦合器的调制不稳定性

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摘要

We theoretically investigate modulation instability (MI) in a two-core nonlinear oppositely directed coupler with a negative-index material channel in the presence of a non-kerr-like nonlinear refractive-index change. Using linear stability analysis, we obtain an expression for the instability gain. It is found that the MI in the nonlinear two-core oppositely directed coupler is significantly influenced by the ratio of the forward- to backward-propagating wave power, nonlinearity, power and saturation. In the normal dispersion regime, the septic nonlinearity is found to suppress the MI by reducing both the gain and width of the instability nonlinearity. But in anomalous dispersion regime, the situation is different because septic nonlinearity enhances the MI by increasing both the gain and width of MI. The increase of septic nonlinearity both in normal and anomalous dispersion regimes increases the gain of the instability nonlinearity. Thus, we report new ways to generate and manipulate the MI and solitons in two-core oppositely directed couplers with a particular emphasis on a negative-index material (NIM) channel in presence of septic nonlinearity.
机译：我们从理论上研究了在存在非kerr类非线性折射率变化的情况下，具有负折射率材料通道的两芯非线性反向定向耦合器中的调制不稳定性（MI）。使用线性稳定性分析，我们获得了不稳定性增益的表达式。已经发现，非线性两芯反向定向耦合器中的MI受到正向和反向传播波功率，非线性，功率和饱和度之比的显着影响。在正常色散状态下，发现化脓性非线性通过减少不稳定性非线性的增益和宽度来抑制MI。但是在异常色散状态下，情况有所不同，因为化脓性非线性会通过增加MI的增益和宽度来增强MI。在正常和异常色散状态下，化脓性非线性的增加都增加了不稳定非线性的获得。因此，我们报告了新的方式来产生和操纵在两芯反向定向耦合器中的MI和孤子，特别是在存在化脓性非线性的情况下，重点关注负折射率材料（NIM）通道。

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