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Title: Low-complexity sparse absolute-term based nonlinear equalizer for C-band IM/DD systems
Authors: Zhang, J 
Lin, Z
Wu, X 
Liu, J
Lau, APT 
Guo, C 
Lu, C 
Yu, S
Issue Date: Jul-2021
Source: Optics express, 5 July 2021, v. 29, no. 14, p. 21891-21901
Abstract: A low-complexity sparse absolute-term based nonlinear equalizer (AT-NLE) is proposed to eliminate the nonlinear signal distortions for intensity modulation and direct detection (IM/DD) systems. By performing the orthogonal matching pursuit (OMP) algorithm to adaptively obtain the significant kernels of both the linear and absolute terms, the computational complexity of the proposed sparse AT-NLE is dramatically reduced and independent of the memory length. The performance of the proposed sparse AT-NLE is experimentally evaluated in a C-band 56-Gbit/s four-level pulse-amplitude modulation (PAM-4) system over a 30-km standard single-mode fiber (SSMF). Experimental results show that compared with the conventional diagonally-pruned Volterra nonlinear equalizer (DP-VNLE) or DP-AT-NLE, the proposed sparse AT-NLE saves 77.7% or 76% real-valued multiplications when their achieved bit error ratios (BERs) are similar. Meanwhile, the proposed sparse AT-NLE reduces the computational complexity by > 28% compared to the sparse DP-VNLE at a BER of 5 × 10−4. The proposed low-complexity sparse AT-NLE shows great potential for high-performance and low-cost IM/DD optical transmission systems.
Publisher: Optical Society of America
Journal: Optics express 
EISSN: 1094-4087
DOI: 10.1364/OE.425896
Rights: © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement (https://www.osapublishing.org/library/license_v1.cfm#VOR-OA)
Journal © 2021
© 2021 Optical Society of America. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.
The following publication Zhang, J., Lin, Z., Wu, X., Liu, J., Lau, A. P. T., Guo, C., ... & Yu, S. (2021). Low-complexity sparse absolute-term based nonlinear equalizer for C-band IM/DD systems. Optics Express, 29(14), 21891-21901 is available at https://doi.org/10.1364/OE.425896
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