University of Hertfordshire

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Unsupervised Support Vector Machines for Nonlinear Blind Equalization in CO-OFDM

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Original languageEnglish
Pages (from-to)1091 - 1094
Number of pages4
JournalIEEE Photonics Technology Letters
Early online date4 May 2018
Publication statusPublished - 15 Jun 2018


A novel blind nonlinear equalization (BNLE) technique based on the iterative re-weighted least square is experimentally demonstrated for single- and multi-channel coherent optical orthogonal frequency-division multiplexing. The adopted BNLE combines, for the first time, a support vector machine-learning cost function with the classical Sato or Godard error functions and maximum likelihood recursive least-squares. At optimum launched optical power, BNLE reduces the fiber nonlinearity penalty by ~1 (16-QAM single-channel at 2000 km) and ~1.7 dB (QPSK multi-channel at 3200 km) compared to a Volterra-based NLE. The proposed BNLE is more effective for multi-channel configuration: 1) it outperforms the “gold-standard” digital-back propagation and 2) for a high number of subcarriers the performance is better due to its capability of tackling inter-subcarrier four-wave mixing.


This document is the Accepted Manuscript of the following article: E. Giacoumidis, et al, 'Unsupervised Support Vector Machines for Nonlinear Blind Equalization in CO-OFDM', Vol. 30 (12): 1091-1094, June 2018. Under embargo until 4 May 2020. The final, published version is available online at doi: © 2018 IEEE

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