Design and Analysis of Variable Gain Amplifier with Erbium –Doped Fiber Switching

Abstract

Design and analysis of Variable gain amplifier with Erbium doped fiber range with the switches by using the WDM technology and a small noise figure (NF) and increased Variable Gain. The EDFA can change the total erbium-doped fiber length by selecting many combinations of five EDFs with optical switches (SWs) and WDM technology. Fundament and principle of the EDFA is based on the spontaneous emission absorption energy levels method. Design and analysis of the numerical calculation of the NF and the pump power using the analytical model of an EDFA indicates that such a variable gain EDFA has an advantage over a conventional multi stage EDFA in terms of Gain variation and required pump power. These characteristics are demonstrated by constructing a variable gain EDFA that employs SWs and variable optical attenuators (VOAs) by using the MATLAB. The variable gain EDFA exhibits a smaller NF variation of 6.5 dB for the 85 dB variable gain range than conventional and more EDFAs amplifiers. Key words-Erbium doped fiber amplifier (EDFA), Wavelength division multiplexing (WDM), and Optical fiber length, VOA (variable optical attenuator), SWs (optical switches).