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

Giacoumidis, Elias, Mhatli, Sofien, Stephens, Marc F.C., Tsokanos, Athanasios, Wei, Jinlong, McCarthy, Mary E., Doran, Nick J. and Ellis, Andrew D. (2017). Reduction of Nonlinear Intersubcarrier Intermixing in Coherent Optical OFDM by a Fast Newton-Based Support Vector Machine Nonlinear Equalizer. Journal of Lightwave Technology, 35 (12), pp. 2391-2397.

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: Engineering & Applied Sciences > Electrical, electronic & power engineering
Engineering & Applied Sciences > Institute of Photonics
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
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Related URLs: http://www.scopus.com/inward/record.url?scp=85028728826&partnerID=8YFLogxK (Scopus URL)
Published Date: 2017-03-07
Authors: Giacoumidis, Elias
Mhatli, Sofien
Stephens, Marc F.C. ( 0000-0002-6533-1893)
Tsokanos, Athanasios
Wei, Jinlong
McCarthy, Mary E. ( 0000-0002-1348-1574)
Doran, Nick J.
Ellis, Andrew D. ( 0000-0002-0417-0547)

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