The technological progress in the means of transmission of information is very fast and it became necessary to obtain high speed in data transmission and high rate of data. Therefore, optical communication systems are the leading methods in this field because they cover these needs, but despite all these characteristics, there is a problem, And we will get rid of this problem in practice in this research through the use of two separate and different wavelengths and connect them to the Wavelength Division Multiplexing and send them to a distance of 3 Km and calculate the amount of dispersion in the signal to the outside of the Optical spectrum analyzer with and without Optical Fiber Bragg Gratings.
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