A full duplex FSO transmission system using RZ-4PAM downlink signals with 67% duty cycle and AMI uplink signalsNi Yu, Yufeng Shao, Anrong Wang, Zhuang Wang, Jie Yang, Qing Tian, Linfang Yi, Qiming Yang, Yanlin Li, Peng Chen, Chong Li, Shuanfan Liu, Renjie Zuo and Jie YuanITM Web Conf., 45 (2022) 02002DOI: https://doi.org/10.1051/itmconf/20224502002