下一代光通信整形设计的探索与实验
Exploring and Experimenting with Shaping Designs for Next-Generation Optical Communications
摘要：
提出了一种结合“几何”和“概率”整形方面的圆形64-QAM。在背靠背、单通道和WDM传输实验中，将其与方形64-QAM进行了比较。首先，对于线性AWGN信道模型，它允许在宽范围的信噪比下接近香农极限操作。第二，WDM模拟超过几百公里表明，所获得的信号噪声比是等同于-或略超过-那些概率整形64-QAM。第三，为了实际验证的目的，与未整形的64-QAM进行实验比较，其中当使用54.2 GBd的19个通道时记录了28%的距离增益。这再次符合-或稍微超过-通常通过概率整形获得的增益。根据实施要求（例如核心前向纠错方案），所研究的调制方案可能是下一代光学系统的关键替代方案。
英文摘要：
A class of circular 64-QAM that combines 'geometric' and 'probabilistic' shaping aspects is presented. It is compared to square 64-QAM in back-to-back, single-channel, and WDM transmission experiments. First, for the linear AWGN channel model, it permits to operate close to the Shannon limits for a wide range of signal-to-noise ratios. Second, WDM simulations over several hundreds of kilometers show that the obtained signal-to-noise ratios are equivalent to - or slightly exceed - those of probabilistic shaped 64-QAM. Third, for real-life validation purpose, an experimental comparison with unshaped 64-QAM is performed where 28% distance gains are recorded when using 19 channels at 54.2 GBd. This again is in line - or slightly exceeds - the gains generally obtained with probabilistic shaping. Depending upon implementation requirements (core forward-error correcting scheme for example), the investigated modulation schemes may be key alternatives for next-generation optical systems.
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