光网络中的闭合全光环路在一定条件下会形成环路激射 ,对网络造成不利的影响。从网络的通带光谱特性出发 ,分析了全光空闲环路和全光泄漏环路激射形成的原因和物理条件 ,并建立了光网络实验系统 ,发现了多个激射峰同时存在并相互竞争的现象。还研究了光节点滤波特性对全光环路激射的影响 ,指出当谱宽失配时 ,在同一信道内可能出现多个全光环路并形成激射。观察到同一个信道内两个泄漏环路激射峰和信号波长共存的现象。最后 ,指出了环路激射的危害 ,提出了消除的方法 The closed all-optical loop in an optical network may form a ring lasing under certain conditions, which may adversely affect the network. Based on the spectral characteristics of the passband of the network, the causes and physical conditions for the lasing of the all-optical idle loop and the all-optical leakage loop are analyzed. An optical network experiment system is established, in which multiple lasing peaks exist and interact with each other The phenomenon of competition. The effect of optical node filtering on the all-optical loop lasing is also studied. It is pointed out that when the spectral width mismatch, multiple all-optical loops may appear in the same channel and form lasing. It is observed that the two leak loops in the same channel have the coexistence of the lasing peak and the signal wavelength. Finally, the harm of loop lasing was pointed out and the method of elimination was put forward