In this paper, the performance of WDM-FSO communications system is simulation analyzed, using NRZ modulation technique over different weather conditions. Based on this technique the received signal power, signal to noise ratio, Q. factor, and BER are analyzed. The characteristics of WDM was studied for free space optical communication. Simulation results indicate that the performance of WDM-FSO are more suited for strong attenuation. On the other hand, the suitability of distance link under this technique are studied, where WDM has more advantage when used in optical communication system.
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