设计并实验研究了一种采用Fabry-Perot (F-P)光纤滤波器的2 μm波段宽带可调谐全光纤环形激光器，经过放大的1 550 nm半导体激光泵浦单模铥-钬共掺光纤（THDF）获得2 μm波段宽带增益。实验结果表明，该结构在2 μm波段获得了195 nm调谐范围的激光输出，线宽0.05 nm，边模抑制比66.98 dB。整个结构采用铥-钬共掺光纤放大结构，可使输出功率达到瓦级。

An all-fiber tunable fiber laser with 2 μm band based on Fabry-Perot (F-P) fiber filter was designed and demonstrated experimentally. An amplified 1 550 nm semiconductor laser was adopted to pump a segment of Tm-Ho co-doped fiber (THDF), and then the optical gain at 2 μm band was obtained. The results indicate that the tuning range, linewidth and side-mode suppression ratio of the output laser are 195 nm, 0.05 nm and 66.98 dB,respectively. The whole structure adopts the THDF amplification structure, which can achieve output power of watt level.