16QAM is found to achieve the lowest SNR penalty against the Shannon limit at the GMI of 2~3 bits/channel use compared to the analyzed 2- and 4-dim modulation formats. The FEC OSNR limit of 16QAM is measured to require ~1 dB less than 8QAM at the same GMI of 2.4 bits/channel use.

© 2016 Optical Society of America

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