51.1-Tbit/s MCF transmission over 2, 520 km using cladding pumped 7-core EDFAs. - Koki Takeshima; Takehiro Tsuritani; Yukihiro Tsuchida; Koichi Maeda; Tsunetoshi Saito; Kengo Watanabe; Toru Sasa; Katsunori Imamura; Ryuichi Sugizaki; Koji Igarashi; Itsuro Morita; Masatoshi Suzuki (OFC, 2015)