提出并实验证实了三能级掺杂光纤复合腔环形激光器共振选模振荡原理和腔内自建可饱和吸收机制对双向行波共振模的去耦作用，并实现复合腔掺Ｅｒ３＋全光纤环形激光器单纵模双向同时激射 It is proposed and experimentally verified that the resonant mode-switching oscillation principle of a three-level doped optical fiber ring resonator and the self-built saturable absorption mechanism of a three-level doped optical fiber have the effect of decoupling the two-way traveling-wave resonance mode and realizing the Er3 + Single longitudinal mode two-way simultaneous lasing