Transmission of RZ-DQPSK over 6500 km with 0.66 bit/s/Hz spectral efficiency

T. Tokle, C.R. Davidson, M. Nissov, J.-X. Cai, D.G. Foursa, A. Pilipetskii
IEEE/LEOS Workshop on Advanced Modulation Formats, 2004  
doi:10.1109/admf.2004.1321692 fatcat:ea3wnkutm5drtkhxshj2nicgp4