We introduce a practical sign-dependent sequence selection metric for probabilistic amplitude shaping and propose a simple method to predict the gains in signal-to-noise ratio (SNR) for sequence selection. The proposed metric provides a $0.5$ dB SNR gain for single-polarized 256-QAM transmission over a long-haul fiber link.

翻译：本文为概率幅度整形提出了一种实用的符号相关序列选择度量标准，并提出了一种简单方法来预测序列选择带来的信噪比增益。所提出的度量标准在长距离光纤链路的单偏振256-QAM传输中实现了0.5 dB的信噪比增益。