The last few years, many studies have been published on the 3rd-order inverse Volterra\nseries transfer function nonlinear equalizer (IVSTF-NLE) in long-haul optical communication systems.\nNonetheless, no experimental work has been published on investigating the potential of the\n3rd-order IVSTF-NLE for the compensation of Kerr nonlinearities in a long-haul wavelength division\nmultiplexing (WDM) system consisting of high-bit rate super-channels, as high as 400 Gb/s. In this\npaper, we study experimentally the performance of a 3rd-order IVSTF-NLE in a coherent optical\nWDM system, with a central, 400-Gb/s, 4-band, dual-polarization (DP), 16-ary quadrature amplitude\nmodulation (QAM) orthogonal frequency division multiplexing (OFDM) super-channel. We compare\nits performance against the performance of the digital back-propagation split-step Fourier (DBP-SSF)\nmethod for the compensation of nonlinearities after 10 Ã?â?? 100 km of ITU-T G.652 standard single\nmode fiber (SSMF). In the second part of this paper, we compare, via Monte Carlo simulations,\nthe performance of the 3rd-order IVSTF-NLE and the DBP-SSF method, in terms of reach extension\nand computational complexity, after propagation through ITU-T G.652 SSMF and a ITU-T G.655 large\neffective area fiber (LEAF). By means of both experimental evaluation and simulations, we show that,\nin the presence of strong nonlinear effects, the 3rd-order IVSTF-NLE, which uses a single step per\nspan, performs similarly with the two-steps-per-span DBP-SSF, whereas the eight-steps-per-span\nDBP-SSF is only marginally better but at the vast expense of computational complexity.
Loading....