simulation and analysis the performance of 3970 km dwdm transmission link employing optimized semiconductor optical amplifiers

in this paper first we try to analysis the behavior ofthe soas in the optical networks and then have proposed anumerical simple model to simulate the behavior of thesemiconductor optical amplifiers. after that by employing thismodel as inline amplifier for a dwdm optical system, we havesimulated the transmission of 10 channels with bit rate 10 gb/sup to distance 3970 km with rz-dpsk modulation format at 20ghz channel spacing. on the other hand in order to amplify thesignal at the transmission link, we have used 73.5km relay spanconsist of 63km single mode fiber (smf), 10.5km dispersioncompensating fiber (dcf) and a soa at the end. our resultsshow that by optimizing the key parameters of the soa such asthe bias current and the input power and furthermore by properplacement of the spans, we can transmit the signal with goodamplification and low noise power.