To combine the individual benefits of probabilistic-shaping (PS) and time-frequency-packing (TFP), we consider for the first time PS-TFP wavelength-division multiplexing (WDM) superchannels. However, TFP introduces inter-symbol interference (ISI) and/or inter-carrier interference (ICI). Moreover, the presence of reconfigurable optical add-drop multiplexers in the fiber links may further degrade the system performance. In this letter, we efficiently handle such challenges to present PS-TFP superchannels enabling Terabit-per-second data rates. For this, we perform a joint ISI and ICI channel estimation in tandem with turbo equalization to mitigate the interference. We investigate optimizing the parameters in the shaping and packing dimensions to achieve a desired target spectral efficiency. We show through our numerical results that such an optimized PS-TFP transmission leads up to 1.2 dB performance improvement over an unshaped Nyquist WDM system under similar conditions.

中文翻译：

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时频封装太比特超信道传输中的概率整形

为了结合概率整形 (PS) 和时频打包 (TFP) 的各自优势，我们首次考虑了 PS-TFP 波分复用 (WDM) 超级信道。然而，TFP 引入了符号间干扰 (ISI) 和/或载波间干扰 (ICI)。此外，光纤链路中可重构光分插复用器的存在可能会进一步降低系统性能。在这封信中，我们有效地应对了此类挑战，以呈现支持每秒太比特数据速率的 PS-TFP 超级通道。为此，我们执行联合 ISI 和 ICI 信道估计与 Turbo 均衡以减轻干扰。我们研究优化整形和包装尺寸中的参数以实现所需的目标频谱效率。