Network power has become a nation strategy. How to ensure the reliable transmission of information in the network system has become very important. According to the case study of the Federal Communication Commission, more than 1/3 of the communication interruptions are caused by the damage of optical fiber cables. In the face of a large number of fiber optical communication networks, timely accurate non-destructive detection and online monitoring of the damage points in the fiber links have become an urgent and real-life problem to be solved.