We present a multi-stage M-QAM CPE scheme based on the crossed constellation transformation algorithm. The linewidth-symbol-rate of 1×10-4 and 4×10−5 are obtained for 28-GBaud 16-QAM and 64-QAM coherent optical communication systems respectively with 1dB penalty at BER=3.8×10−3.

© 2014 Optical Society of America

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