Currently it is not possible to create a fully optical communication system without a software tool which simulates an optical\ncommunication line in real conditions prior to its construction. The aim of this article is to establish a comparison between the\nEDFA (erbium doped fibre amplifier) and SOA (semiconductor optical amplifier) optical amplifiers in the WDM (wavelength\ndivision multiplexing) system. The system contains a four-channel WDM with speed of 10 Gbps and optical fibre with length of\n80 km. Simulations are conducted in the programme environment ââ?¬Å?OptSim.ââ?¬Â The quality of the optical communication system is\nevaluated by the BER (bit error rate) and
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