The EDFL is structured by insertion of three different short passive subring cavities, which serve as mode filters, into the main cavity, and it is combined with a fiber Bragg grating (FBG), the MRCs resonator can make SLM lasing.

• 这种激光器通过在主环形腔中插入充当模式滤波器的三个长度不等的无源次级环形腔,并结合腔内光纤布拉格光栅(FBG)形成多环形腔掺铒光纤激光器结构,多环形谐振腔可保证激光器的单纵模输出。