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Experimental Performance of 4D Optimized Constellation Alternatives for PM-8QAM and PM-16QAM

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Abstract

Sensitivity and reach of soft-decoded PM-8QAM was improved by 1.2-dB and 35%, respectively, by moving to a 64 point 4D constellation and iterative decoding. Replacing PM-16QAM by 256 4D points led to 0.3-dB gain only.

© 2014 Optical Society of America

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