The exotic properties of topological photonic crystals (PCs) have a series of application prospects in the field of optical communication. We present a Y-shaped beam splitter based on topologically protected waveguide, which consists of the topologically trivial PCs with line defect. The investigation results indicate it has the merits of unidirectional propagation, robustness, and excellent transmission performance. Compared with magnetic-optical PC beam splitter, the proposed configuration composed of rods with silicon material that can realize topological beam-splitting effect in the absence of external magnetic field and has a smaller size. It is suitable for miniaturization to implement in all-optical network as an optical communication device.

中文翻译：

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具有拓扑保护缺陷波导的Y形分束器

拓扑光子晶体（PC）的奇异特性在光通信领域具有一系列应用前景。我们提出了一种基于拓扑受保护的波导的Y形分束器，它由具有线路缺陷的拓扑琐碎的PC组成。研究结果表明，它具有单向传播，鲁棒性和优良的传输性能的优点。与磁光PC分束器相比，所提出的结构由硅材料杆组成，在没有外部磁场的情况下可以实现拓扑分束效果，并且具有较小的尺寸。在全光网络中实现为光通信设备适合于小型化。