Opterna’s Fiber Sentinel System uses WaveSense TechnologyTM to monitor such optical anomalies and provides continuous, real-time, protocol independent physical layer monitoring of a fiber optic communication system. It detects any signal variations (including tapping or signal injections), shuts down instantly and isolates affected path in milliseconds, re-routes the traffic to a back-up fiber path (which will also be monitored) and notifies the network administrator.