Adaptive moment estimation for polynomial nonlinear equalizer in PAM8-based optical interconnects

Ji Zhou, Haide Wang, Jinlong Wei, Long Liu, Xincheng Huang, Shecheng Gao, Weiping Liu, Jianping Li, Changyuan Yu, Zhaohui Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

39 Citations (Scopus)


Adaptive moment estimation (Adam) is a popular optimization method to estimate large-scale parameters in neural networks. This paper proposes the first use of Adam algorithm to fast and stably converge large-scale tap coefficients of polynomial nonlinear equalizer (PNLE) for 129-Gbit/s PAM8-based optical interconnects. PNLE is one of simplified Volterra nonlinear equalizer for making a trade-off between complexity and performance. Different from serial least-mean square (LMS) adaptive algorithm, Adam algorithm is a parallel processing algorithm, which can obtain globally optimal tap coefficients without being trapped in locally optimal tap coefficients. Timing error is one of the main obstacles to the PAM systems with high baud rate and high modulation order. Owing to parallel processing and global optimization, Adam algorithm has much better performance on resisting the timing error, which can achieve faster, more-stable and lower-MSE convergence compared to LMS adaptive algorithm. In conclusion, Adam algorithm shows great potential for converging the tap coefficients of PNLE in PAM8-based optical interconnects.

Original languageEnglish
Pages (from-to)32210-32216
Number of pages7
JournalOptics Express
Issue number22
Publication statusPublished - 28 Oct 2019

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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