Experimental Comparison of 64-QAM and Combined Geometric-Probabilistic Shaped 64-QAM

We present a novel format of combined geometric-probabilistic shaped QAM constellation. We measure about 1 dB sensitivity gain compared to conventional 64-QAM at 54.2 GBaud and 25% of overhead under different scenarios including back-to-back, single-channel and WDM transmissions.

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