Demonstration of State-of-polarization Change Localization Based on Digital Coherent Transceivers. - Naoya Okada; Joji Terashi; Setsuo Yoshida; Reiko Kuroiwa; Yu Tajima; Ichiro Yokokura; Atsushi Kanai; Junichi Sugiyama; Norihiro Yoshida; Shoichiro Oda; Kousuke Komaki; Takeshi Hoshida (OFC, 2025)