We theoretically explain how multipath interference resizes PAM-4 constellation in the coherent regime and thus increases bit error rate fluctuation in intra data centers for the first time.

翻译：本文首次从理论上解释了在多径干扰下，PAM-4星座图如何发生尺寸变化，从而增加了数据中心内部相干通信中误码率的波动。