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39th European Conference and Exhibition on Optical Communication (ECOC 2013)
We propose several 8-dimensional modulation formats for coherent fiber-optic communications. For spectral efficiencies of 1.75 and 2 b/s/Hz/pol, the proposed modulations offer up to 1 dB gain over DP-QPSK. European Conference and Exhibition on Optical Communication (ECOC) This work may not be copied or reproduced in whole or in part for any commercial purpose. Permission to copy in whole or in part without payment of fee is granted for nonprofit educational and research purposes provided thatdoi:10.1049/cp.2013.1368 fatcat:s4amyaqkuzbt5ithaxbudfjhii