光网络中的全光环路激射

Lasing effect in optical cycles in optical networks

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 。

Closed all optical cycles in optical networks may generate lasing which adversely affects network performance. The network optical spectrum is used to analyze the causes and physical conditions for both all optical idle cycles and all optical leakage cycles. An experimental optical network was built to observe multiple lasing peaks co existing and competing in a fiber. Multiple closed leakage cycles were found to occur in one optical channel with bandwidth mismatch. Two lasing peaks per leakage cycle were observed in one channel co existing with the signal wavelength. Methods are proposed to eliminate the damage due to lasing cycles.