title: Mitigation of nonlinear transmission effects for OFDM 16-QAM optical signal using adaptive modulation.
abstract: 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.
authors.forename: Anton S
authors.initials: AS
authors.lastname: Skidin
authors.forename: Oleg S
authors.initials: OS
authors.lastname: Sidelnikov
authors.forename: Mikhail P
authors.initials: MP
authors.lastname: Fedoruk
authors.forename: Sergei K
authors.initials: SK
authors.lastname: Turitsyn