Abstract: The concept of erbium-doped fiber amplifier (EDFA) is relatively abstract and the theoretical derivation process is very complex, so it is difficult for traditional theoretical teaching to stimulate students' learning interest. For this reason, in this paper MATLAB is introduced into EDFA simulation assistant teaching, and the classic EDFA simulation model is established by using the powerful numerical analysis function of MATLAB. The simulation results show the relationship between EDFA gain and the length of the Erbium-doped fiber as well as gain and pump power. The combination of simplified derivation process and the visual simulation results of Matlab are conducive to stimulating students' learning interest and deepening their understanding of EDFA.

Key words: Erbium-doped fiber amplifier, Matlab, Gain