| Network security concerns have recently been increased due to the vast amount of information that flows in a single fiber. At the application layer, data security relies on end-user encryption algorithms, many of which are known to be vulnerable, and authentication algorithms are not fool-proof as the sophistication of eavesdroppers and unau-thorized bad actors increases. As a result, the communica-tions link may be attacked by eavesdroppers to access data, to mimic the source, or to cause service denial. To accomplish this however, the transmission link must be compromised. Therefore, if an a priori link and channel signature has been established at the receiver, then an un-authorized intervention is possible to be detected, reported and counteracted. In this paper we provide an analysis of the link and channel parameters that affect the signal per-formance, which also constitute the identification signa-ture of the optical channel. When the medium is compro-mised, the channel parameters are affected and thus the channel performance. We also develop a model and we simulate conditions of channel attack. |