Zhang Junwei, Tan Heyun, Li Fan, Lau Alan Pak Tao, Li Zhaohui, Lu Chao
Opt Lett. 2024 Oct 15;49(20):5937-5940. doi: 10.1364/OL.535047.
An ultra-low-complexity third-order weight-sharing trigonometric nonlinear equalizer (WS-TNLE) is proposed to eliminate nonlinear signal distortions in short-reach optical interconnects exceeding net 200 Gb/s/λ. By replacing the second- and third-order nonlinear terms in a third-order weight-sharing diagonally pruned Volterra nonlinear equalizer (WS-DP-VNLE) with cosine and sine terms, respectively, the required number of real-valued multiplications per symbol of the proposed third-order WS-TNLE is significantly reduced to the same value as the number of weight-sharing kernels. When transmitting probabilistically shaped 16-level pulse amplitude modulation (PS-PAM-16) signals at net rates ranging from 200.4 Gb/s to 300.4 Gb/s over a 1-km standard single-mode fiber (SSMF), the proposed third-order WS-TNLE requires the lowest number of real-valued multiplications per symbol, ranging from 10 to 44, which reduces the computational complexity by up to 96.2% and 52.4% compared to the third-order WS-DP-VNLE and WS-DP-absolute-term nonlinear equalizer (WS-DP-ATNLE), respectively.
提出了一种超低成本三阶权重共享三角非线性均衡器（WS-TNLE），以消除净速率超过200 Gb/s/λ的短距离光互连中的非线性信号失真。通过分别用余弦项和正弦项替换三阶权重共享对角修剪的沃尔泰拉非线性均衡器（WS-DP-VNLE）中的二阶和三阶非线性项，所提出的三阶WS-TNLE每个符号所需的实值乘法数量显著减少到与权重共享内核数量相同的值。当在1公里标准单模光纤（SSMF）上以200.4 Gb/s至300.4 Gb/s的净速率传输概率整形16电平脉冲幅度调制（PS-PAM-16）信号时，所提出的三阶WS-TNLE每个符号所需的实值乘法数量最少，为10至44，与三阶WS-DP-VNLE和权重共享绝对项非线性均衡器（WS-DP-ATNLE）相比，分别将计算复杂度降低了高达96.2%和52.4%。
