Vector beams with different polarization topological orders (PTOs) are the eigenmodes of traditional optical fibers and are orthogonal to each other, so the PTO multiplexing channel is a promising candidate for the oncoming generation of optical communication. Here we demonstrate experimentally a PTO sorting system with high separation resolution based on the diffractive splitting (DS) method. Our experiments show that our design with the DS method helps to enhance the separation resolution to 77.5% from 58%, compared to a design without the application of a DS method. Theoretically, to increase the copy number can promote the separation resolution further. This Letter provides a high-resolution way to decode information from PTO division multiplexing.

中文翻译：

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用衍射分裂法改善极化拓扑的排序

具有不同偏振拓扑阶数（PTO）的矢量束是传统光纤的本征模，并且彼此正交，因此PTO多路复用信道是即将到来的光通信时代的有希望的候选者。在这里，我们以衍射分离（DS）方法为基础，实验演示了具有高分离分辨率的PTO分拣系统。我们的实验表明，与不使用DS方法的设计相比，使用DS方法的设计有助于将分离分辨率从58％提高到77.5％。从理论上讲，增加拷贝数可以进一步提高分离分辨率。这封信提供了一种高分辨率的方法来解码来自PTO分区多路复用的信息。