报道了一种新型高功率超宽带光纤光源。利用980 nm激光二极管(LD)和1480 nm LD双向抽运掺铒光纤,经光纤环镜反射后,得到C+L波段自发辐射谱。通过调整980 nm LD和1480 nm LD的功率,在1524.0～1600.6 nm(76.6 nm)范围内,自发辐射谱功率高于-18.8 dBm,并且在1539.2～1600.6 nm(61.4 nm)范围内,自发辐射谱的平坦度为2.8 dB。总荧光功率为22.1 mW,转换效率为18.8%。如果不加环镜,并且保持相同的抽运条件,得到的放大自发辐射(ASE)谱宽在1525～1565 nm的C波段范围,其总的荧光功率为7.1 mW,转换效率仅为6%。通过分析加环镜情况与不加环镜情况下所得到的自发辐射谱,以及加环镜情况下采用不同的抽运方式得到的自发辐射谱,最终得出结论,通过加环镜,并且用980 nm LD和1480 nm LD双向抽运,得到了具有最佳效果的超宽带光纤光源。实验过程中通过调整980 nm LD和1480 nm LD的功率,曾得到28.5 mW的荧光功率,转换效率为22.3%。

A novel structure high power and ultra bandwidth superfluorescence source is reported in this paper. With bi-directional pump of 980 nm LD and 1480 nm LD, C+L band ASE reflected by fiber loop mirror is got. By adjusting the power of LDs, 76.6 nm bandwidth from 1524.0 to 1600.6 nm is acquired where the ASE power is higher than -18.8 dBm, and from 1539.2 nm to 1600.6 nm (61.4 nm), the flatten of ASE is within 2.8 dB. The total ASE power is 22.1 mW and the power conversion rate is 18.8%. Without the fiber loop mirror, only C band ASE from 1525 to 1565 nm is got while the pump condition remains the same. The total ASE power is 7.1 mW and the power conversion rate is only 6%. From the experiment, the best ultra bandwidth superfluorescence source with the ASE power of 28.5 mW and the power conversion rate of 22.3% is acquired by adjusting the bi-directional pump power of LDs and using fiber loop mirror.