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用Stark能级分裂的变化分析了掺铝改变掺铒光纤放大器 (EDFA)光谱特性的原理 ,并用改进型化学气相沉积法 (MCVD)结合溶液浸泡掺杂法制作了采用不同掺铝比例的掺铒光纤 ,测试了用这几种光纤制作的放大器的自发辐射谱 ,得出掺铝浓度的提高使荧光谱的峰值往短波长移动 ,与Stark能级分裂理论分析得到的结果相一致。同时采用截断法测试了两种不同掺铝浓度的掺铒光纤的吸收谱 ,实验结果表明掺铒光纤中增加铝的含量将提高铒离子浓度 ,并提高掺铒光纤的吸收系数 ,减短掺铒光纤放大器中的掺铒光纤长度。高掺铝掺铒光纤放大器具有更宽更平坦的增益谱线 ,可以适用长距离波分复用 (WDM )系统
The principle of changing the spectral characteristics of EDFA with Al-doped aluminum was analyzed by the variation of Stark level splitting, and the results were compared with the results of the improved chemical vapor deposition (MCVD) and solution immersion doping Fiber. The spontaneous emission spectra of the amplifiers fabricated with these fibers were tested. The results show that the increase of Al concentration increases the peak of the fluorescence spectrum to a short wavelength, which is consistent with the theoretical analysis of Stark level splitting. At the same time, the absorption spectra of two kinds of erbium-doped fibers with different aluminum concentrations were tested by truncation method. The experimental results show that increasing the content of aluminum in erbium-doped fibers will increase the concentration of erbium ions and increase the absorption coefficient of erbium-doped fibers, Erbium-doped fiber length in fiber amplifier. Highly doped aluminum doped erbium-doped fiber amplifier with a wider and more flat gain spectrum can be applied to long-distance wavelength division multiplexing (WDM) system