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。

Alumina codoping can change the spectra of Er doped fiber amplifier (EDFA), which can be analyzed by Stark energy level splitting theory. Several types of EDFs with different alumina concentration were fabricated by modified chemical vapor deposition (MCVD) and solution doping method, and the fluorescence spectra of the alumina codoping EDF amplifier was explored. The investigation showed that alumina codoping result in a shift of fluorescence toward shorter wavelength. The absorption coefficients of EDFs with different alumina doping concentration was measured by cutoff method, and the result demonstrate that increasing the alumina concentration in EDF will increase the concentration of Er, which can improve the absorption coefficients of EDF and shorten the length of EDF in EDFA. High alumina codoping EDFA have wider and flatter gain spectra, which can be used in long haul wavelength division multiplexing (WDM) system.