Research on Key Distribution and Encryption Control System of Optical Network Physical Layer

With the wide application of large-capacity and high-speed optical networks, its security has become a current research focus. Due to the limitations of traditional key distribution and encryption schemes, this paper proposes an innovative key distribution and encryption control scheme based on physical layer channel feature extraction and analysis. First of all, the transceiver terminal extracts the physical characteristics of the fiber channel separately, and generates a consensus key through quantization coding. Second, use the generated key base to encrypt the transmission sequence, map the Quadrature Phase Shift Keying (QPSK) signal to the high-order 1024×1024-QAM signal, and use the noise stream to perform the high-order QAM. The signal is flooded. The system utilizes channel non-replication and randomness of channel noise, the security and randomness of the key are good, and the key formation rate is high and the key generation equipment is simple. The system uses high-order QAM modulation, which increases the security of the system. The experimental results show that the coding rate of the key generated by the system reaches 400kb/s, and the coding performance of the key is better; the operating key is generated by the key base extension, which has strong anti-interception ability; the system has a low bit error rate and secure transmission Good performance.