6.3-Tb/s unrepeatered transmission over 402-km fiber using high power Yb-free clad-pumped L-band EDFA. - Benyuan Zhu; Peter Ingo Borel; Kenneth Carlson; X. Jiang; David W. Peckham; Robert Lingle; M. Law; J. Rooney; Man F. Yan (OFC, 2014)