The impact of the fiber Kerr effect on error statistics in the nonlinear (high power) transmission of the OFDM 16-QAM signal over a 2000 km EDFA-based link is examined. We observed and quantified the difference in the error statistics for constellation points located at three power-defined rings. Theoretical analysis of a trade-off between redundancy and error rate reduction using probabilistic coding of three constellation power rings decreasing the symbol-error rate of OFDM 16-QAM signal is presented. Based on this analysis, we propose to mitigate the nonlinear impairments using the adaptive modulation technique applied to the OFDM 16-QAM signal. We demonstrate through numerical modelling the system performance improvement by the adaptive modulation for the large number of OFDM subcarriers (more than 100). We also show that a similar technique can be applied to single carrier transmission.
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Funding: EPSRC (UNLOC); and Ministry of Education and Science of Russian Federation (RFMEFI57814X0029 and 14.B25.31.0003).
Mitigation of nonlinear transmission effects for OFDM 16-QAM optical signal using adaptive modulation
Skidin, A. S. (Creator), Sidelnikov, O. (Creator), Fedoruk, M. P. (Creator) & Turitsyn, S. (Creator), 28 Feb 2017