SIMULATION OF COUNTERACTION TO COVERT INTERCEPTION OF AN INFORMATION SIGNAL OF AN UPSTREAM DATA STREAM IN A PASSIVE OPTICAL ACCESS NETWORK

The article considers the simulation of countering the covert interception of confidential information transmitted in the upstream data stream of the passive optical access network of the point-to-multipoint architecture (P2MP PON-TDM). The secrecy of the intercep tion is due to the presence of back-reflected signals in the split connections of the backbone section of the fiber-optic communication line of the passive optical access network. To counteract this method of information interception, it is proposed to transmit an interference signal in the downward direction at a wavelength of 1310 nm. Evaluation of the effectiveness of this method is carried out by modeling in OptiSystem CAD. The result of the simulation are graphs of the dependence of the Q-factor on the inverse optical losses in the split connections and on the optical power level of the interference signal. Based on the analysis of graphs, the proposed method is considered effective provided that the level of optical power of the interference and information signal reflected from the split con nection of the main fiber optic cable on the subscribers' side is equal. To counteract, it is enough to apply one source of interference, the parameters of which are similar should be similar to the parameters of the upstream signal. Recommendations are also given to counteract the covert interception of upstream data in the P2MP PON-TDM optical access network.