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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 m W的光波抽运时,1384~1480 nm波段的增益系数大于1.5 d B/m,噪声系数趋近5 d B。
Based on the self-developed bismuth-doped fiber, the experimental and theoretical studies on its spectral characteristics were carried out. Four obvious absorption bands were found by experimentally measured absorption spectra with centers of 494, 816, 946 and 1410 nm, respectively. The Giles model was used to study the amplification characteristics of the fiber. The effects of fiber length, pumping power and input signal power on the signal gain and noise figure were analyzed. The rate equation and transmission equation of the three-level transition model under steady-state conditions are established, and the Runge-Kutta algorithm is used to conduct the numerical study. The results show that the gain coefficient of the 1384 ~ 1480 nm band is greater than 1.5 d B / m and the noise figure approaches 5 d B at the wavelength of 830 nm and the power of 200 mW.