优化400 G数据中心互连的离散多音传输
Optimizing Discrete Multi-tone Transmission for 400G Data Center Interconnects
摘要：
离散多音传输（DMT）是未来400 G数据中心互连的一个有前途的候选方案。8个通道，每个通道承载56 Gb/s的数据，可以组合在一个50 GHz的通道网格中，形成一个400 Gb/s的超级通道。对于满载的96通道DWDM系统，这导致总容量为4.8 Tb/s。为了满足目标应用在成本效率和低功耗方面的要求，重要的是保持数字信号处理的复杂度尽可能低。对于DMT，复杂度主要由快速傅立叶变换（FFT）的长度决定。由于数据中心互连仅需桥接通常为80 km的距离，因此我们在此研究FFT长度等参数对56 Gb/s DMT仅在此距离下可实现性能的影响。传输在C波段执行，以启用DWDM，并且不应用光色散补偿。我们考虑双边带（DSB）和残留边带（VSB）DMT。可以看出，128的FFT长度足以达到误码率方面的所需性能，然而，更高的长度可以显著提高性能。
英文摘要：
Discrete multi-tone transmission (DMT) is a promising candidate for future 400G data center interconnects. Eight channels, each carrying 56 Gb/s of data can be combined in a 50-GHz channel grid to form a 400 Gb/s superchannel. For a fully loaded 96 channel DWDM system this leads to a total capacity of 4.8 Tb/s. To meet the requirements of the targeted application in terms of cost efficiency and low power consumption, it is important to keep the complexity for the digital signal processing as low as possible. For DMT, the complexity is mainly determined by the length of the fast Fourier transformation (FFT). Since data center interconnects only have to bridge a distance of typically 80 km, we here investigate among other parameters the influence of the FFT length among other parameters on the achievable performance for 56 Gb/s DMT only for this distance. Transmission is performed in C-band to enable DWDM and no optical dispersion compensation is applied. We consider double sideband (DSB) as well as vestigial sideband (VSB) DMT. It can be seen that an FFT length of 128 is sufficient to reach the required performance in terms of bit error ratio, however, a higher length can significantly improve the performance.
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