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Photonic crystal power-splitter based on mode splitting of directional coupling waveguides

机译：基于定向耦合波导模式分裂的光子晶体功率分配器

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摘要

In the paper, a novel power-splitting scheme based on two dimensional photonic crystal (2D PhC) is proposed. The structure can be divided into three sections, including the input waveguide, coupling region, and output region, and the latter two sections consist of two parallel waveguides placed in proximity. The operation principle of the splitter is that only one of the super-modes splitting from the directional coupler can propagate through coupling region in the frequency range of interest. The radius of air holes next to the guiding region in coupling region is increased to avoid the acute back reflection at the entrance to the input waveguide induced by the modes mismatch between the input waveguide and coupling region. While in output region, the radius of these corresponding air holes is also increased so that the two splitting super-modes have same propagation constants to avoid the coupling between the two output waveguides. Moreover, as the length of coupling region is varied, its influence on the splitting performance is discussed, and it is verified that the relationship between the splitter length and bandwidth has a trade-off.
机译：本文提出了一种基于二维光子晶体（2D PhC）的新型功率分路方案。该结构可分为三个部分，包括输入波导，耦合区域和输出区域，后两个部分由两个相邻放置的平行波导组成。分离器的工作原理是，只有从定向耦合器分离出的超模之一可以传播通过感兴趣频率范围内的耦合区域。增大耦合区域中与引导区域相邻的气孔的半径，以避免由输入波导和耦合区域之间的模式不匹配引起的在输入波导入口处的剧烈背反射。在输出区域中时，这些相应气孔的半径也增加了，以使两个分裂的超模具有相同的传播常数，以避免两个输出波导之间的耦合。此外，随着耦合区域长度的变化，讨论了其对分离性能的影响，并证明了分离器长度与带宽之间的关系具有折衷。

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