The design modeling and numerical simulation of a Bismuth-doped glass fiber amplifier

Abstract

At present, the main communication window of fiber amplifier is in C-band ( ), and the amplification technology in O-band ( ) needs to be improved. The optical fiber amplification technology of band is studied in this paper. Based on three different Bismuth-doped glass materials, the design modeling and numerical simulation are carried out, and the corresponding amplification bands are ,  and . The rate equation and transmission equation of the three-level transition model in steady state were established. The gain, the power of pump, the power of signal and ASE signal power of the three bands were simulated by MATLAB, and the material with the best performance was further analyzed. The results show that  signal light has the best amplification effect, and the maximum gain is  when the fiber length is . It is also found that the optical fiber length required to achieve the optical signal optical gain with the pump power is positive correlation, and with the doping concentration is negative correlation, which are complementary to each other. This conclusion has important significance for the design of bismuth-doped optical fiber amplifier.