论文标题
部分可观测时空混沌系统的无模型预测
Apodizer Design to Efficiently Couple Light into a Fiber Bragg Grating
论文作者
论文摘要
我们提供了一个最佳的控制框架，可有效地将裸纤维中的光有效地耦合到具有立方非线性的Bragg光栅中。轻晶粒的相互作用激发了间隙孤子，这是一种本地化的非线性相干状态，在禁忌频带间隙中以中心频率传播，从而导致组速度较慢。由于带隙的性质，光栅的强反射特性反射了大量的光。我们通过预测的梯度下降方法优化了先前设计的不均匀光栅结构的传输效率，以便将更慢的光融入光栅中。我们进一步使用遗传算法以及先前未开发的设计参数：光栅chirp，进一步探索了可能的光栅设计的空间。通过这些方法，我们发现将更大一部分光的结构与创建较慢的脉冲的额外奖励相结合。
We provide an optimal control framework for efficiently coupling light in a bare fiber into Bragg gratings with a cubic nonlinearity. The light-grating interaction excites gap solitons, a type of localized nonlinear coherent state which propagates with a central frequency in the forbidden band gap, resulting in a dramatically slower group velocity. Due to the nature of the band gap, a substantial amount of light is back-reflected by the grating's strong reflective properties. We optimize, via a projected gradient descent method, the transmission efficiency of previously designed nonuniform grating structures in order to couple more slow light into the grating. We further explore the space of possible grating designs, using genetic algorithms, along with a previously unexplored design parameter: the grating chirp. Through these methods, we find structures that couple a greater fraction of light into the grating with the added bonus of creating slower pulses.
