A novel QoS oriented RoF system employing Bessel filter and external modulation to overcome non-linear transmission impairments

Abstract

In optical WDM transport networks, the significant challenges for the transmission are non-linear impairments such as four-wave mixing (FWM), self-phase modulation and cross-phase modulation. These fiber nonlinearities result in deterioration of the performance of WDM systems. In this paper, the effects of FWM has been investigated on radio over fiber (RoF) links and a new RoF simulation model has been developed and discussed for wireless applications. The proposed model utilizes the Mach–Zehnder modulator in conjunction with Bessel filter to reduce the effect of FWM in RoF system. The simulation results (using OptiSystem 14.0) shows a reasonable reduction in FWM effects by considering performance metrics such as channel spacing, input source power and fiber dispersion. In comparison with existing RoF system, it is concluded that the proposed model provides the reduction in FWM sideband power by 10 dBm using channel spacing (10 nm), dispersion (16.75 ps/nm-km) and input power (− 10 dBm). This seems to be a viable QoS (quality of service) oriented RoF model for RoF system supporting wireless applications.