Abstract
Optical orthogonal frequency-division multiplexing offset-quadrature amplitude modulation (OFDM/OQAM) increases the system spectral efficiency compared with the conventional optical OFDM by removing the cyclic prefix (CP) inserted between consecutive optical OFDM blocks. For optical OFDM/OQAM, the orthogonal condition is relaxed from the complex domain to the real field. Thus, nonlinear suppression for this kind of system is much more complicated than for optical OFDM. In this paper, we proposed a dual Volterra expansion based nonlinear equalization (DVNE) method for the suppressing of nonlinear interference for polarization division multiplexed (PDM) optical OFDM/OQAM system. In this work, nonlinear interference concentration property of the filter banks is systemically discussed for PDM OFDM/OQAM system. Then, pilot-aided DVNE nonlinear equalization method is proposed to improve system robustness against nonlinear interference by using specially designed pilot sequences. As shown in numerous Montel Carlo simulation results, system robustness against nonlinear interference have been improved significantly for both 59.97 Gb/s 4-QAM CO-OFDM/OQAM and 59.97 Gb/s 16-QAM CO-OFDM/OQAM system respectively thanks to the proposed method.
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