Eight-Dimensional Modulation for Coherent Optical Communications

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 that all such whole or partial copies include the following: a notice that such copying is by permission of Mitsubishi Electric Research Laboratories, Inc.; an acknowledgment of the authors and individual contributions to the work; and all applicable portions of the copyright notice. Copying, reproduction, or republishing for any other purpose shall require a license with payment of fee to Mitsubishi Electric Research Laboratories, Inc. All rights reserved. Copyright c ©Mitsubishi Electric Research Laboratories, Inc., 2013 201 Broadway, Cambridge, Massachusetts 02139