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Tradeoff between Geometric and Probabilistic Shaping for a 64 Points Modulation

01 January 2018

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We present a novel format of combined geometricprobabilistic shaped QAM constellation, named CQAM. This new modulation format allows probabilisitc shaping with binary and non binary codes. The main motivation of this work is to design efficien high speed receiver. We perform comparisons of a PCS 64-CQAM and PCS 64-QAM in terms of mutual information and generalized mutual information. Some experimental results are also presented. 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.