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A nonlinear equalization for a PAM4 IM/DD system using MZM

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Abstract

The nonlinear distortion caused by the Mach-Zehnder modulator (MZM) is one of the main limiting factors for the improvement of the transmission performance of the intensity modulation and direct detection (IM/DD) optical communication system. In order to solve the problem, an improved Volterra nonlinear equalization (VNLE) method is proposed. Compared with the traditional VNLE that uses the least mean square (LMS) to calculate the tap coefficients, the improved VNLE uses the least square (LS) method to obtain more stable convergence. The simulation results show that the VNLE based on LS has better performance when solving complex nonlinear damage. For 25 Gbaud 4-level pulse amplitude modulation (PAM4) signals, the improved VNLE can reduce the bit error rate (BER) to below 10−4 in a 7-km-long single-mode optical fiber transmission system. In addition, in order to make the BER below 10−3, the transmission distance that the improved VNLE can withstand is about 1.5 km longer than that of the traditional VNLE.

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Authors and Affiliations

  1. College of Communication Engineering, Jilin University, Changchun, 130012, China

    Li Li, Ran Liu & Yadong Sun

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  1. Li Li
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  2. Ran Liu
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  3. Yadong Sun
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Correspondence to Li Li.

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The authors declare that there are no conflicts of interest related to this article.

This work has been supported by the National Key Technology and Development Project of China (No.2018YFB2201500).

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Li, L., Liu, R. & Sun, Y. A nonlinear equalization for a PAM4 IM/DD system using MZM. Optoelectron. Lett. 18, 0238–0242 (2022). https://doi.org/10.1007/s11801-022-1165-z

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  • DOI: https://doi.org/10.1007/s11801-022-1165-z

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