Experimental demonstration of 448-Gbps+ DMT transmission over 30-km SMF. - Toshiki Tanaka; Masato Nishihara; Tomoo Takahara; Weizhen Yan; Lei Li 041; Zhenning Tao; Manabu Matsuda; Kazumasa Takabayashi; Jens C. Rasmussen (OFC, 2014)