报道了一种结构简单的可变波长输出的L 波段线型腔掺铒光纤激光器。其中的波长选择器件为一包括两段高双折射光纤在内的光纤环镜 ,通过调整环镜内偏振控制器的状态可以改变环镜对不同波长的反射率以获得可变波长输出的效果。线型腔内用 980nm激光抽运铒光纤产生的ASE作二次抽运源 ,使腔内铒光纤的增益谱由C 波段位移到L 波段。实验中观察到波长在 1 5 83～ 1 6 0 0nm范围内可变的稳定激光输出 ,波长调谐范围为 1 7nm A simple and variable wavelength output L - band cavity EDF laser is reported. The wavelength selecting device is a fiber ring mirror comprising two sections of high birefringence optical fibers. By adjusting the state of the polarization controller in the loop mirror, the reflectivity of the ring mirror to different wavelengths can be changed to obtain the effect of variable wavelength output. The ASE produced by the erbium-doped fiber with a 980 nm laser is pumped in the linear cavity, and the gain spectrum of the erbium fiber in the cavity is shifted from the C-band to the L-band. In the experiment, the stable laser output with variable wavelength in the range of 1583 ~ 16000 nm was observed with a wavelength tuning range of 17 nm