On the Impact of Digital Back Propagation Nonlinearity Compensation in Non-Repeatered Transmission WDM Systems

We have numerically evaluated transmission property and bit error rate (BER) performance of 120Gbps Dual-Polarization Quadrature Amplitude Modulation (DP-16QAM) digital coherent signals, with and without nonlinear compensation using digital back propagation (DBP). If the maximum transmitter powers are defined as the powers at which BER floor levels are
$1.0\times 10^{-2}$
without error correction, the maximum transmitter power is +17.2 dBm for single-channel 120Gbps DP-16QAM formats in large-core and low-loss single-mode silica fibers nonrepeatered systems. There is 2 dB development compared without using DBP approach. However, the performance is affected by nonlinear interference in DWDM non-repeatered systems, the improvement has been reduced to 0.6dB due to disturbance from neighboring DWDM channels.