Field demonstration of 3×341-Gb/s PDM-OFDM-256 iterative polar modulation signals with a record 11.0-b/s/Hz intrachannel spectral efficiency. - S. Chandrasekhar 001; Xiang Liu 018; Peter J. Winzer; T. Lotz; Chun Ju Youn; Y. H. Kwon; E. S. Nam (OFC, 2014)