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Appl. Sci. 2018, 8(3), 447;

Comparison of Nonlinear Compensation Techniques for 400-Gb/s Coherent Multi-Band OFDM Super-Channels

Department of Physics, University of Patras, Rio, 26500 Patras, Greece
LTCI, CNRS, Telecom ParisTech, Université Paris Saclay, 75013 Paris, France
Orange Labs Networks, 2 Avenue Pierre Marzin, 22307 Lannion, France
Aston Institute of Photonic Technologies, Aston University, Birmingham B4 7ET, UK
Department of Electrical and Computer Engineering, Montana State University, Bozeman, MT 59717, USA
Author to whom correspondence should be addressed.
Received: 30 January 2018 / Revised: 4 March 2018 / Accepted: 13 March 2018 / Published: 15 March 2018
(This article belongs to the Special Issue DSP for Next Generation Fibre Communication Systems)
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The last few years, many studies have been published on the 3rd-order inverse Volterra series transfer function nonlinear equalizer (IVSTF-NLE) in long-haul optical communication systems. Nonetheless, no experimental work has been published on investigating the potential of the 3rd-order IVSTF-NLE for the compensation of Kerr nonlinearities in a long-haul wavelength division multiplexing (WDM) system consisting of high-bit rate super-channels, as high as 400 Gb/s. In this paper, we study experimentally the performance of a 3rd-order IVSTF-NLE in a coherent optical WDM system, with a central, 400-Gb/s, 4-band, dual-polarization (DP), 16-ary quadrature amplitude modulation (QAM) orthogonal frequency division multiplexing (OFDM) super-channel. We compare its performance against the performance of the digital back-propagation split-step Fourier (DBP-SSF) method for the compensation of nonlinearities after 10 × 100 km of ITU-T G.652 standard single mode fiber (SSMF). In the second part of this paper, we compare, via Monte Carlo simulations, the performance of the 3rd-order IVSTF-NLE and the DBP-SSF method, in terms of reach extension and computational complexity, after propagation through ITU-T G.652 SSMF and a ITU-T G.655 large effective area fiber (LEAF). By means of both experimental evaluation and simulations, we show that, in the presence of strong nonlinear effects, the 3rd-order IVSTF-NLE, which uses a single step per span, performs similarly with the two-steps-per-span DBP-SSF, whereas the eight-steps-per-span DBP-SSF is only marginally better but at the vast expense of computational complexity. View Full-Text
Keywords: nonlinear equalizers; volterra series transfer function; digital back-propagation nonlinear equalizers; volterra series transfer function; digital back-propagation

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Vgenopoulou, V.; Song, M.; Pincemin, E.; Jaouën, Y.; Sygletos, S.; Roudas, I. Comparison of Nonlinear Compensation Techniques for 400-Gb/s Coherent Multi-Band OFDM Super-Channels. Appl. Sci. 2018, 8, 447.

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