Full C-band 3317-km 12-Coupled-Core-Fiber Transmission with 266.2-Tbps Capacity Using Field-Installed Fiber-Optic Cable. - Kohki Shibahara; Akira Kawai; Megumi Hoshi; Masanori Nakamura; Takayuki Kobayashi; Ryota Imada; Takayoshi Mori; Taiji Sakamoto; Yusuke Yamada; Kazuhide Nakajima; Munehiko Nagatani; Hitoshi Wakita; et al. (OFC, 2025)