论文部分内容阅读
受激布里渊散射(SBS)是光纤中一种非常重要的非线性效应,并且其阈值较低,在光纤中极易产生,造成光纤系统中作为信号载体的入射光的能量损耗,并且其后向散射光有可能对光源造成损害,从而限制进入光纤功率及系统的传输距离。从受激布里渊散射的基本原理出发,分析讨论了受激布里渊散射阈值与光源调制频率、光源线宽、光纤长度及损耗系数的关系。设计并搭建了实验系统,实际测量得到了19.5 km的G.653光纤受激布里渊散射阈值,实验结果与理论计算吻合。
Stimulated Brillouin scattering (SBS) is a very important non-linear effect in optical fiber and its threshold is low, which is very easy to produce in optical fiber, resulting in energy loss of incident light as signal carrier in optical fiber system. Backscattered light may cause damage to the light source, thus limiting the optical fiber into the power and transmission distance of the system. Based on the principle of stimulated Brillouin scattering, the relationship between stimulated Brillouin scattering threshold and modulation frequency of light source, light source linewidth, fiber length and loss coefficient was analyzed. The experimental system was designed and built, and the G.653 fiber stimulated Brillouin scattering threshold of 19.5 km was measured. The experimental results agree well with the theoretical calculations.