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IEEE/ICACT20210252 Question.2 Questioner: lijingwei10@huawei.com 2021-02-09 오후 9:11:43	IEEE/ICACT20210252 Answer.2 Answer by Auhor ra-maneekut@kddi-research.jp 2021-02-09 오후 9:11:43
For the long-haul transmission experiment over 800 km, it gets better shaping gain,why it happens? And do you have other ways to improve this perfermance further?	The shaping gain using MAP detection is strongly depended on the entropy H(P) that's why we can see large shaping gain for the case of low H(P). Furthermore, the distance is chosen based on the target SNR, it may suffer from the deterioration in the ASE side more than the fiber nonlinearity side that's why we can see the shaping gain in MAP-BER vs SNR curve. MAP detection gives good performance in AWGN regime.

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