Research of FWM eavesdropping attack detection method based on the comparison of OSNR

This paper introduces the principle of the parameter comparison method and the eavesdropping attack implementation scheme, analyses the feasibility of detecting eavesdropping attack by means of the parameter comparison method. The result of simulation shows: following with the increasing of the fiber's loss coefficient α and single span length L, whenever there is attack or not, the difference value of the detected fiber input and output OSNR's difference drops or fluctuates. Therefore, by studying the difference value rule when the eavesdropping appears in the different place of the fiber link, an appropriate difference value can be found to be the threshold to detect whether there is eavesdropping attack in the optical networks.