As the optical network structure becomes larger and more complex

optical network faults are more likely to occur. After a network fault occurs

due to the derivative characteristics of network alarms

the root cause alarms will generate multiple derivative alarms. Therefore

after network faults occur

the network management system will receive alarm storms. Due to the complex relationship between faults and alarms

the difficulty of locating network faults

especially multiple faults

has also risen sharply. In response to this problem

the knowledge graph technology that is good at managing massive amounts of information and revealing the characteristics of data is introduced into optical networks. The alarm knowledge graph contains rich relationships between alarms

which can be completed by combining Graph Neural Network (GNN) technology. The knowledge-guided automatic reasoning of the root cause of network faults is in line with the fault location ideas of the operation and maintenance personnel in the operation and maintenance process. Further

the network topology information is added in the fault location process

and the knowledge dimension of the knowledge graph is improved. The limitation of the single-fault scenario is lifted

and a high accuracy rate is obtained in the multi-fault location scenario.