The evolution of data transmission using optical fiber media has been accelerated since the advent of technical multiplexing wavelengths (WDM), which helps to achieve bit rates of a few Tb/s transported by a single fiber. In this context, we propose in this work, to make a simulation of a system WDM, at 4·10Gb/s with the COMSIS simulator system. We will interest especially to demultiplexing.
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