论文标题
叠加光栅耦合器的设计原理
Design principles of apodized grating couplers
论文作者
论文摘要
为了优化光栅耦合器的耦合效率，我们将扩展了一个分析模型，以考虑到散射的旋转耦合器的设计，并考虑到制造技术确定的散射强度的上限和下限的约束。我们证明，我们的模型通过存在这种约束的存在给出了散射强度的全局最佳分布。我们将模型应用于从硅芯片到单模光纤的标准问题，以及更复杂的问题，包括耦合到涡流束，以及聚焦光栅的设计。在耦合到涡流梁的问题中，我们使用全波数值模拟验证了模型。对于这个问题，我们的设计获得了与现有设计相比的效率明显更高。我们的理论研究为不同材料平台中的空白光栅耦合器设计奠定了坚实的基础，并且我们的确定性算法可以作为高级优化的接近最短起点。
To optimize the coupling efficiency of grating couplers, we extend an analytical model for the design of apodized grating couplers, taking into account the constraints on the upper and lower bounds of the scattering strength as determined by fabrication technology. We prove that our model gives the global optimum distribution of the scattering strength with the presence of such constraints. We apply our model to the standard problem of coupling from a silicon chip to a single-mode fiber, as well as more complex problems including the coupling to a vortex beam, and the design of a focusing grating. In the problem of coupling to a vortex beam, we validate our model with full-wave numerical simulations. For this problem, our design obtains efficiency that is significantly higher compared with existing designs. Our theoretical study provides a solid foundation for apodized grating coupler design in different material platforms, and our deterministic algorithm can function as a near-optimum starting point for advanced optimizations.
