Cluster-based Method for Eavesdropping Identification and Localization
  in Optical Links
Haokun Song Rui Lin Andrea Sgambelluri Filippo Cugini Yajie Li Jie Zhang Paolo Monti
We propose a cluster-based method to detect and locate eavesdropping events
in optical line systems characterized by small power losses. Our findings
indicate that detecting such subtle losses from eavesdropping can be
accomplished solely through optical performance monitoring (OPM) data collected
at the receiver. On the other hand, the localization of such events can be
effectively achieved by leveraging in-line OPM data.