Li Shimao, Nong Zhichao, Wu Xiong, Yu Wen, He Mingbo, Klitis Charalambos, Zhu Yuntao, Gao Shengqian, Liu Jie, Li Zhaohui, Liu Liu, Sorel Marc, Yu Siyuan, Cai Xinlun
Opt Express. 2018 Nov 12;26(23):29895-29905. doi: 10.1364/OE.26.029895.
Orbital angular momentum (OAM) multiplexing has emerged as an important method to increase the communication capacities in future optical information technologies. In this work, we demonstrate a silicon integrated OAM (de)multiplexer with a very simple structure. By simply tapping the evanescent wave of two different whispering gallery modes rotating inside a multimodal micro-ring resonator, four in-plane waveguide modes are converted to four free-space vector OAM beams with high mode purity. We further demonstrate chip-to-chip OAM multiplexing transmission using a pair of silicon devices, which shows low-level mode crosstalk and favorable link performance.
轨道角动量（OAM）复用已成为未来光信息技术中提高通信容量的一种重要方法。在这项工作中，我们展示了一种结构非常简单的硅集成OAM复用/解复用器。通过简单地提取在多模微环谐振器内旋转的两种不同回音壁模式的倏逝波，四个平面内波导模式被转换为四个具有高模式纯度的自由空间矢量OAM光束。我们还使用一对硅器件演示了芯片间的OAM复用传输，其显示出低水平的模式串扰和良好的链路性能。
