4-channel WDM System Using OptiSystem

The fast evolution of Internet traffic and emerging applications can be considered a significant driver for high capacity and cost effective optical fibre transmission technologies  The technique of the information transmitting between two positions is a fibre optic communication, which is completed by sending light within the optical fibre  This communication system can be used for long distance applications that’s needed a total transmission capacity and increasing cost recovering  Optical transmission systems are popular for maintaining low power for short to medium range wireless communications  A pplications where transmission distance is large high power is required In an optical fibre various nonlinear effects begin to appear as the optical power level increases Radio over fibre RoF is an analogue optical link transmitting modulated RF signals  It assists in transmitting the RF signal downlink and uplink to and from the centralstation to the base station.  The characteristics of great capacity high speed with small losses are considered at the beginning for the RoF systems, where the main advantage of Rof systems is the mobile communication adaptability and flexibility to associate with the growth movement of the forthcoming 5 G mobile communication in addition to the request services for gigabit size . W avelength division multiplexing (WDM) technique is used in optical communication for the multiplexing sum of optical carrier signals that have various wavelengths within a single optical fibre  These signals have different laser light wavelengths to carry different signals. They can realize higher data rate, larger capacities, and enhanced flexibility with a comparatively low cost. • Using WDM as an alternative to the FDM (frequency division multiplexing) technique was suggested in 1970 by DeLange • The total capacity per fibre optic within this WDM technique is assumed by N R, where R represents the channel bit rate and is supposed to be similar for all channels