Information Security Monitoring in Optical Access Networks

The paper provides some grounding in theory of methods for extracting information from optic fiber. The simplest of the analyzed methods is bending of the optical fiber when the conditions for full internal reflection are broken. The functional dependence of losses and radiated power level on parameters and geometry of bending in optic fiber is described. In this case, the monitoring system controls the introduced losses to detect fiber bends. The paper describes the structure, principles of monitoring system operation, as well as the trends in the development of monitoring systems. In addition, the paper gives the main technical specifications of devices for optical radiation monitoring.