19-ring-air-core fiber supporting thousands of OAM modes for spatial division multiplexing

• DOI: 10.1364/ol.453079
• Publication Date: 2022-03-25T14:00:34Z
• Authors: Yingning Wang; Wenqian Zhao; Jiahe Hu; Zhi Wang; Yan-ge Liu; Changjing Bao; Yongxiong Ren; Zhongqi Pan; Yang Yue
• Keywords: Mode volume

We propose and design a 19-ring-air-core fiber that can support about 3000 orbital angular momentum (OAM) modes (156 in each ring) with <-80 dB inter-ring cross talk across the entire C L bands after 100-km propagation. Moreover, eigenmodes are all separated from their adjacent by effective index differences >2.67 × 10-4 mode groups > 1.90 10-2, which guarantee stable transmission of OAM modes. This designed is potential candidate for applications spatial division multiplexing (SDM) optical channels to improve capacity next-generation high-speed communication systems, especially short-distance applications. In this Letter, we also show relationship between supported numbers, total talk, refractive intra-ring during optimization through numerical simulations. It provide related reference future multi-ring-core fibers.