Abstract

Fiber nonlinearity mitigation is a crucial technology for extending transmission reach and increasing channel capacity in high-baud rate wavelength division multiplexing (WDM) systems. In this work, we propose a novel, to the best of our knowledge, architecture that combines learned modified digital back-propagation (L-MDBP) to compensate for intra-channel nonlinearity and a two-stage decision-directed least mean square (DDLMS) adaptive equalizer to mitigate inter-channel nonlinearity. By leveraging globally optimized model parameters and adaptive channel estimation, the proposed scheme achieves superior performance and lower computation complexity compared with conventional DBP. Specifically, in an 8 × 64 Gbaud 16-ary quadrature amplitude modulation (16QAM) experimental system over 1600 km of standard single-mode fiber (SSMF), our approach shows a 0.30-dB Q²-factor improvement and a complexity reduction of 82.3% compared with DBP with 8 steps per span (SPS). Furthermore, we enhance the adaptability of the architecture by introducing an online transfer learning (TL) technique, which requires only 2% of initial training epochs.

© 2023 Optica Publishing Group

Generalized Rayleigh quotient optimization method for inter-channel nonlinearity compensation in coherent optical communication systems

Tianxiang Lan, Chuanchuan Yang, Xiansong Fang, Fan Zhang, Wenjing Yu, Weiqin Zhou, and Zhangyuan Chen
Opt. Lett. 49(3) 694-697 (2024)

Joint intra and inter-channel nonlinearity compensation based on interpretable neural network for long-haul coherent systems

Du Tang, Zhen Wu, Zhongliang Sun, Xizi Tang, and Yaojun Qiao
Opt. Express 29(22) 36242-36256 (2021)

Joint intra and inter-channel nonlinear compensation scheme based on improved learned digital back propagation for WDM systems

Xinyu Chi, Chenglin Bai, Fan Yang, Qi Qi, Ruohui Zhang, Hengying Xu, Lishan Yang, Wanxiang Bi, Tianchi Chen, and Shunchang Bai
Opt. Express 32(4) 5095-5116 (2024)

Comparison of DSP-based nonlinear equalizers for intra-channel nonlinearity compensation in coherent optical OFDM

Elias Giacoumidis, Sofien Mhatli, Tu Nguyen, Son T. Le, Ivan Aldaya, Mary E. McCarthy, Andrew D. Ellis, and Benjamin J. Eggleton
Opt. Lett. 41(11) 2509-2512 (2016)

Beyond 300-Gbps/λ photonics-aided THz-over-fiber transmission employing MIMO single-carrier frequency-domain equalizer

Chen Wang, Jianjun Yu, Jiao Zhang, Min Zhu, Yuxuan Tan, Kaihui Wang, Junjie Ding, Wen Zhou, Tangyao Xie, Jianguo Yu, and Feng Zhao
Opt. Lett. 48(6) 1363-1366 (2023)