基于自主研制的掺铋光纤，对其进行光谱特性的实验和理论研究。通过实验测得的吸收光谱发现了4 个明显的吸收带，其中心分别是494、816、946、1410 nm。运用Giles 模型对此光纤进行了放大特性的研究，分析了光纤长度、抽运功率和输入信号光功率等参数对信号的增益和噪声指数的影响。建立了稳态情况下三能级跃迁模型的速率方程和传输方程，并利用Runge-Kutta算法进行了数值研究。结果表明掺铋光纤在波长为830 nm 、功率为200 mW的光波抽运时，1384~1480 nm 波段的增益系数大于1.5 dB/m，噪声系数趋近5 dB。

Spectral properties of bismuth-doped optical fiber developed independently are experimentally and theoretically studied. The four absorption peaks centered at 494, 816, 946 and 1410 nm are observed in the absorption spectrum of the fiber. Using the Giles model, the amplification characteristics of the fiber are studied, and the influences of fiber length, pump power and input signal power on the gain and noise figure are analyzed. In the steady state, the rate equations and propagation equations of three-level model are established and calculated by means of Runge-Kutta method. The results show that when the bismuth-doped optical fiber is pumped at 830 nm and 200 mW in power, gain coefficients between from 1384 nm to1480 nm are large than 1.5 dB/m and the noise figures are nearly 5 dB.