Abstract

In optical fiber communication, optical and electrical components introduce nonlinearities, which require effective compensation to attain highest data rates. In particular, in short reach communication, components are the dominant source of nonlinearities. Volterra series are a popular countermeasure for receiver-side equalization of nonlinear component impairments and their memory effects. However, Volterra equalizer architectures are generally very complex. This article investigates soft deep neural network (DNN) architectures as an alternative for nonlinear equalization and soft-decision demapping. On coherent 92GBd dual polarization 64QAM back-to-back measurements performance and complexity is experimentally evaluated. The proposed bit-wise soft DNN equalizer (SDNNE) is compared to a 5th order Volterra equalizer at a 15% overhead forward error correction (FEC) limit. At equal performance, the computational complexity is reduced by 65%. At equal complexity, the performance is improved by 0.35 dB gain in optical signal-to-noise-ratio (OSNR).

Probabilistic neural network equalizer for nonlinear mitigation in OAM mode division multiplexed optical fiber communication

Fei Wang, Ran Gao, Sitong Zhou, Zhipei Li, Yi Cui, Huan Chang, Fu Wang, Dong Guo, Chao Yu, Xinyu Liu, Ze Dong, Qi Zhang, Qinghua Tian, Feng Tian, Yongjun Wang, Xin Huang, Jinghao Yan, Lin Jiang, and Xiangjun Xin
Opt. Express 30(26) 47957-47969 (2022)

Bi-directional gated recurrent unit neural network based nonlinear equalizer for coherent optical communication system

Xinyu Liu, Yongjun Wang, Xishuo Wang, Hui Xu, Chao Li, and Xiangjun Xin
Opt. Express 29(4) 5923-5933 (2021)

Adaptive parallel decision deep neural network for high-speed equalization

Luo Zhang, Jian Jie, and Lai Mingche
Opt. Express 31(13) 22001-22011 (2023)

Kernel mapping for mitigating nonlinear impairments in optical short-reach communications

Lu Zhang, Xiaodan Pang, Aleksejs Udalcovs, Oskars Ozolins, Rui Lin, Xin Yin, Ming Tang, Weijun Tong, Shilin Xiao, and Jiajia Chen
Opt. Express 27(21) 29567-29580 (2019)

Low-complexity Volterra-inspired neural network equalizer in 100-G band-limited IMDD PON system

Luyao Huang, Wenqing Jiang, Yongxing Xu, Weisheng Hu, and Lilin Yi
Opt. Lett. 47(21) 5692-5695 (2022)