High-Resolution Frequency-Modulated Dual-Pulse Phase-Sensitive Optical Time-Domain Reflectometry with Direct Detection - Cheng, Yafeng; Xie, Zhiyang; Ming, Changpeng; Wang, Hanyong; Qian, Lei; Dong, Lei; Zhang, Hongguang; Wang, Dong; Luo, Ming; Liu, Wu; Huang, Tianye; Li, Xiang (2024 Asia Communications and Photonics Conference (ACP) and International Conference on Information Photonics and Optical Communications (IPOC), Information Photonics and Optical Communications (IPOC), 2024 Asia Communications and Photonics Conference (ACP) and International Conference on, 2024)