以PbSe量子点作为激活增益介质，在由量子点掺杂光纤、波分复用器、光纤光栅等组成的全光纤环形谐振腔中，实验首次观测到了波长为1550 nm、稳定连续的激光振荡。在980 nm激光二极管(LD)抽运下，发现了明显的抽运激励阈值。低于激励阈值时，没有激光；高于激励阈值时，激光输出功率随激励功率线性增大。激光输出为多模，通过光纤弯绕方式可选出单模输出。对于50 μm纤芯直径的多模量子点光纤，当入纤抽运功率为68 mW时，实测激光输出功率为19.2 mW（多模）和6.31 mW（单模），激光的3 dB线宽小于0.1 nm，抽运效率分别为28%和9.3%。

A PbSe nanocrystal quantum dot doped fiber laser (QDFL) is achieved in experiment by doping the PbSe quantum dots (QDs) into the fiber and configuring an all-fiber ring resonator consisting of quantum dot doped fiber (QDF), wavelength division multiplexer (WDM), and fiber Bragg grating (FBG). Upon 980 nm laser diode (LD) pumping, an obvious exciting threshold is observed, i.e., lower than the threshold, no laser appears; higher than it, the laser output increases linearly with the pumping power. The laser output is of multiple modes, while single mode can be selected out by bending fiber technique. Upon pump power of 68 mW inputted into the fiber with 50 μm diameter, the laser output power comes to 19.2 mW (multi-mode) and 6.31 mW (single mode) with linewidth less than 0.1 nm, corresponding to pumping efficiency of 28% and 9.3%, respectively.