The route detection and fault location technology for submarine optical cables is one of the key technologies in under-sea cable maintenance.In view of the shortcomings and insufficiency of the present commonly used detection methods

this paper proposes a passive submarine optical cable route detection technology.It introduces its system principle

presents the design scheme and gives the effective simulation method and simulation results.The results indicate that the larger the voltage decline slope

the farther the distance between the coil and the cables

enabling the system to effectively carry on route tracking and fault location.