FWM effect in FTTH over DWDM for 320 Gbps link distance 80 km

We investigate the FWM impacts in FTTH over DWDM system. Even above SBS threshold, FWM was found to be available at lower launched power, inducing low cross-talk in this DWDM-PON. Nominal central frequencies for dense WDM systems based on 12.5 GHz anchored to the 193.1 THz reference. Thus dependency of channel spacing of 12.5 GHz, 25 GHz, 50 GHz and 100 GHz spaced DWDM-PON at a OLT-ONU link distance of 80 km are the focus area of our investigations. The nonlinearity effect of FWM on the performance of DWDM all optical star networks is being demonstrated in terms of Q-factor. The results are presented in graphical forms using practical parameters values at bit rates of 320 Gb/s. Simulation shows that the launched power is increased up to 10 dB with signal format of NRZ are used. It is demonstrated that waveform distortion due to FWM among different carriers in DWDM becomes deterministic by narrow channel spacing of 12.5 GHz and launched power less than 1 dBm.