Wang Xiao-Kai, Li Jian-She, Li Shu-Guang, Guo Ying, Meng Xiao-Jian, Wang Guo-Rui, Wang Lu-Yao, Li Zeng-Hui, Zhao Yuan-Yuan, Ding Yu-Xin. Design and research of a broadband mode-division multiplexer based on three-core photonic crystal fiberJ. Acta Physica Sinica, 2022, 71(4): 044206. DOI: 10.7498/aps.71.20211187