Unrepeatered Transmission Over 670.64 km of 50G BPSK, 653.35 km of 100G PS-QPSK, 601.93 km of 200G 8QAM, and 502.13 km of 400G 64QAMJ. M. Xu, Min Xiang, Weihua Li et al.|Journal of Lightwave Technology|2019Cited by 28