Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 35, Issue 12, Pages 2391-2397Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2017.2678511
Keywords
Coherent detection; coherent optical OFDM; non-linearity mitigation; support vector machines
Funding
- Centre of Excellence (CUDOS) [CE110001018]
- EPSRC [EP/J017582/1, EP/L000091/1, EP/M005283/1]
- Sterlite Technologies Ltd.
- EPSRC [EP/M005283/1, EP/L000091/1, EP/J017582/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/M005283/1, EP/L000091/1, EP/J017582/1] Funding Source: researchfish
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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 similar to 6 times lower.
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