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分别用980nm和830nm的半导体激光器作为泵浦源激发铋/铒共掺光纤,采用前向和背向泵浦方式分析放大的自发辐射谱特性.实验结果表明:随着泵浦功率的增大,荧光强度显著增强.利用980nm半导体激光器,采用前向泵浦方式可激发以1 142nm和1 536nm为中心的两个辐射带,以1 142nm为最高辐射峰的3dB带宽是141nm,以1 536nm为最高辐射峰的3dB带宽是29nm.利用830nm半导体激光器,采用前向泵浦方式可激发以1 421nm为中心的荧光谱,3dB带宽是447nm.980nm和830nm激光器分别前向泵浦铋/铒共掺光纤时,随着光纤长度的增加,荧光先增强后减弱;分别背向泵浦铋/铒共掺光纤时,随着光纤长度的增加,荧光强度先逐渐增强后保持稳定.在25~80℃的温度范围内,铋/铒共掺光纤的荧光强度几乎不受温度的影响.使用980nm和830nm泵浦源同时激发铋/铒共掺光纤,结果表明铋/铒共掺光纤的发光中心具有相对独立性,发光范围存在部分重叠.
The birefringent / erbium codoped optical fiber was excited by 980nm and 830nm semiconductor laser respectively, and the amplified spontaneous emission spectra were analyzed by forward and backward pump.The experimental results show that with the increase of pump power, The fluorescence intensity is significantly enhanced.With the 980nm semiconductor laser, the forward pumping mode can be excited to two radiation bands centered at 1 142 nm and 1 536 nm, the maximum 3dB bandwidth at 1 142 nm is 141 nm, and the maximum at 1 536 nm The 3dB bandwidth of the radiation peak is 29nm. The forward-pumping mode can excite the fluorescence spectrum centered at 1 421nm with the 830nm semiconductor laser and the 3dB bandwidth is 447nm. The 980nm and 830nm lasers pump the bismuth / erbium codoped fiber , The fluorescence first increases and then decreases with the increase of the length of the fiber. When the bismuth / erbium co-doped fibers are dumped backwards, the fluorescence intensity first increases and then increases with the increase of the fiber length. At 25-80 ℃ In the temperature range, the fluorescence intensity of bismuth / erbium codoped fiber is almost unaffected by the temperature.Using 980nm and 830nm pump sources to excite the bismuth / erbium codoped fiber at the same time, the results show that the luminescence centers of bismuth / erbium codoped fiber are relatively independent Sex, hair There is some overlapping range.