Estimation and mitigation of four wave mixing in wavelength division multiplexing radio over fiber system using hybrid modules

In this paper, we have proposed hybrid four wave mixing (FWM) suppression modules to mitigate the effects of FWM in wavelength division multiplexing (WDM) radio over fiber (RoF) network. The two hybrid modules comprise of optical phase conjugator (OPC), fiber Bragg grating (FBG) and dispersion compensating fiber (DCF). These modules improve the execution of the WDM-RoF framework by suppressing the FWM power up to 30dBm. The overall FWM power is estimated and is found to vary as a function of channel input power. The results depict that the FWM power varies from -70dBm to -47.5 dBm in FBG plus OPC module and from -73.6 dBm to -49.8 dBm in DCF plus OPC module. The FBG plus OPC module provides a suppression of FWM power up to 27.3 dBm while the FBG plus OPC module suppresses up to 30 dBm. Thus, DCF plus OPC module has greater efficiency for mitigating FWM effects than the FBG plus OPC module.