Ge/Si APD Receiver with Record-high Sensitivity Exceeding -30 dBm for 50G PON. - Hengzhen Cao; Ning Wang; Xu Wang; Wenjun Chen; Qihong Wu; Weichao Sun; Zhen Dong; Zhiyong Feng; Zongzhao Zheng; Fan Xu; Daoxin Dai (OFC, 2025)