Such a fiber laser has a ring resonant cavity.An unpumped erbium-doped fiber (EDF) in the cavity is used as the saturable absorber to achieve single-longitudinal-mode operation.

• 该激光器采用环形腔结构, 利用一段未抽运的掺铒光纤(EDF)的饱和吸收效应来实现光纤激光器的单纵模运转与窄线宽输出;