Method and apparatus for increasing the security of the physical fiber plant by polarization monitoring

摘要

A method and system for detecting intrusions on a fiber optic network. The method and system monitors polarization variations of light being transmitted in the fiber optic network. It then determines intrusions in the fiber optic network based on the polarization variations. The polarization variations are then compared to a database of known activity which would cause polarization variations to determine unknown intrusions. An intrusion alert is initiated when the determined intrusion does not correspond to any known activity. The known activity is contained in an automated database for automatically comparing to the polarization variations. The intrusions may be cross-correlated on two partially adjacent fiber optic cables to determine the location of the intrusion.