Efficiency Of Nonlinear Compensation for WDM-PON Based OFDM Using Optical Back Propagation
The Kerr nonlinearity is the main obstacle that limits the performance of the OFDM WDM system.Moreover, the nonlinear compensation method that is feasible and adds no more complexity to the receiver is very necessary for the long-range passive optical network (LR-PON) applications.In this paper, we investigatethe nonlinear and dispersion compensation efficiency in OFDM WDM LR-PONusing an advance optical back propagation (OBP) approach based on split-step Fourier method. In the OBP, the real optical devices such as the high-nonlinear fiber (HNLF), fiber Bragg grating (FBG) and nonlinear waveguide are used as a nonlinear operator, a dispersive operator and phase conjugated media, respectively. The compensation efficiency ofthe OBP in OFDM WDM LR-PON systems is evaluated by an analytical model and then Monte-Carlo simulations. The obtainedresults fromboth analytical evaluation and simulation show that the OBP can improve remarkably the systemperformance when the parameters of OBP such as dispersion and pump power are properly selected.