Design of O-Band Bismuth-doped Fiber Amplifier (BDFA) and Optimization of Genetic Algorithm

Abstract

In this study, the o-band (1260nm-1360nm) fiber amplifier is designed and optimized based on the characteristics of bismuth-doped materials and the theoretical study of its spectrum. Taking the use of full-band fiber amplifiers as an example, considering that there is still some bandwidth unused in current fiber optic communications, this paper aims to design o-band fiber amplifiers with better gain and higher efficiency. By comparing the spectral properties of different materials, we chose bismuth-doped materials as the gain medium and three-level systems as the model. Based on this model, we established the rate equation and the power propagation equation in the steady state to analyze the effects of fiber length, doping concentration and pump power on the gain of the fiber amplifier. We used a genetic algorithm to optimize the fiber length and doping concentration. Then we designed a center wavelength of 1310nm and a gain factor greater than 26.1Db under the condition of pump light with a wavelength of 830nm and a power of 200mW.