Demonstration of Distance-Dependent Data Channel Recovery in a 40-Gbit/s QPSK 2-Channel Mode-Multiplexed FSO Link by Varying the Longitudinal Wavenumbers of Structured Light. - Ruoyu Zeng; Yingning Wang; Abdulrahman Alhaddad; Huibin Zhou; Hongkun Lian; Muralekrishnan Ramakrishnan; Yuxiang Duan; Zile Jiang; Yue Zuo; Wing Ko; Xinzhou Su; Mo Mojahedi; et al. (OFC, 2025)