Amplification of the Multi-Wavelength Signal by Using EDFA With Constant Gain

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The paper deals with the results of EDFA simulation that has been carried out to study the modes of operation and to determine the amplifier parameters' values at which maximum flatness of the gain spectrum curve is obtained. The mathematical model applied is based on the propagation equations and known parameters of the erbium-doped fiber. Dependencies to determine the wavelength operation range, the fractional upper-state population and the length of the erbium-doped fiber are given. A formula to be used in engineering practice is proposed for the determination of the pump-power optimum value of EDFA with constant gain, the power level of the input multi-wavelength signal being taken into consideration.