提出和验证了一种L波段双波长掺铒光纤激光器(EDFL)双稳态控制变换和双波长开关切换的方法.将偏振控制器(PC)插入基于3dB光纤耦合器的光纤环镜(FLM)中,并将该FLM用作L波段双波长级联线形耦合腔EDFL的公共腔镜,结果表明,调节PC可以改变FLM的反射率,实现对EDFL双稳态特性的有效控制,且双稳态特性随FLM反射率呈单调变化.利用这一性质,提出并证实,对于处在FLM最大反射率对应的双稳态第一跃变点和最小反射率对应的双稳态第二跃变点之间的任意固定抽运光功率,调节PC可实现两个稳态之间的相互变换和双波长之间的相互切换. A method of bistable control switching and dual-wavelength switching of L-band dual-wavelength erbium-doped fiber laser (EDFL) is proposed and validated. The polarization controller (PC) is inserted into the fiber loop mirror (FLM) , And the FLM is used as a common cavity mirror of the L-band dual-wavelength cascaded linear coupling cavity EDFL. The results show that adjusting the PC can change the reflectivity of the FLM to effectively control the bistable characteristic of the EDFL, and the bistable The characteristic changes monotonously with the FLM reflectivity.Using this property, we propose and prove that for the first bistable transition corresponding to the maximum reflectivity of FLM and the second bistable transition corresponding to the minimum reflectivity Between any fixed pump optical power, adjust the PC can be achieved between the two steady-state conversion and switching between the two wavelengths.