Reduction of Nonlinear Intersubcarrier Intermixing in Coherent Optical OFDM by a Fast Newton-Based Support Vector Machine Nonlinear Equalizer

Abstract

A fast Newton-based support vector machine (N-SVM) nonlinear equalizer (NLE) is experimentally demonstrated, for the first time, in 40 Gb/s 16-quadrature amplitude modulated coherent optical orthogonal frequency division multiplexing at 2000 km of transmission. It is shown that N-SVM-NLE extends the optimum launched optical power by 2 dB compared to the benchmark Volterra-based NLE. The performance improvement by N-SVM is due to its ability of tackling both deterministic fiber-induced nonlinear effects and the interaction between nonlinearities and stochastic noises (e.g., polarization-mode dispersion). An N-SVM is more tolerant to intersubcarrier nonlinear crosstalk effects than Volterra-based NLE, especially when applied across all subcarriers simultaneously. In contrast to the conventional SVM, the proposed algorithm is of reduced classifier complexity offering lower computational load and execution time. For a low C-parameter of 4 (a penalty parameter related to complexity), an execution time of 1.6 s is required for N-SVM to effectively mitigate nonlinearities. Compared to conventional SVM, the computational load of N-SVM is ∼6 times lower.

Publication DOI: https://doi.org/10.1109/JLT.2017.2678511
Divisions: College of Engineering & Physical Sciences > School of Informatics and Digital Engineering > Electrical and Electronic Engineering
College of Engineering & Physical Sciences > Aston Institute of Photonics Technology (AIPT)
Additional Information: Copyright: 2017, IEEE. This is an open access article freely accessible at https://dx.doi.org/10.1109/JLT.2017.2678511 Funding: Centre of Excellence; 10.13039/501100000266-EPSRC; Sterlite Technologies Ltd.
Uncontrolled Keywords: Coherent detection,coherent optical OFDM,nonlinearity mitigation,support vector machines,Atomic and Molecular Physics, and Optics
Publication ISSN: 1558-2213
Full Text Link:
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2017-03-07
Accepted Date: 2017-03-01
Authors: Giacoumidis, Elias
Mhatli, Sofien
Stephens, Marc F.C. (ORCID Profile 0000-0002-6533-1893)
Tsokanos, Athanasios
Wei, Jinlong
McCarthy, Mary E. (ORCID Profile 0000-0002-1348-1574)
Doran, Nick J. (ORCID Profile 0000-0001-8309-8805)
Ellis, Andrew D. (ORCID Profile 0000-0002-0417-0547)

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