FOUR WAVE MIXING EFFECT IN WAVELENGTH DIVISION MULTIPLEXING FOR RADIO OVER FIBRE SYSTEM

Abstract

The integration of wireless and optical networks is the potential solution for the increasing capacity and mobility as well as decreasing costs in the access networks. Optical networks are fast, robust and error free, however, there are nonlinearity obstacles preventing them from being perfect media. The performance of wavelength division multiplexing (WDM) in radio over fibre (RoF) system is found to be strongly influenced by nonlinearity characteristics inside the fibre. The effect of four wave mixing(FWM) as one of the influential factors in the WDM for RoF has been studies here using Virtual Photonic Incorporated (VPI) and MATLAB software. It is the advent of the optical amplifier enabling high power and long unregenerate distance that have caused significant fibre nonlinearity that necessitated the use of numerical modelling: to calculate the cross talk due to Four wave mixing and the interplay of nonlinearity. Here numerical modelling is developed with the help of Virtual photonic Incorporated (VPI) software. For the analytic analysis MATLAB software is used. The results obtained from both software, it is found that the FWM effects have become significant at high power levels and have become even more significant when the optical transmission line is increased, which has been done by either increasing the channel bit rate and decreasing the channel spacing, or by the combination of both process. Numerical and analytical simulation is done through the Virtual Photonic Incorporated and MATLAB software respectively, it is found that FWM effects increases as power from the signal sources increases.