Preliminary Study of Secure-Enhanced Coherent Optical Orthogonal Frequency Division Multiplexing System Based on DNA Encoding

With the increasing demand for optical fiber communication technology, the coherent orthogonal frequency division multiplexing (CO-OFDM) system, which combines the advantages of orthogonal frequency division multiplexing (OFDM) and coherent detection, and has the characteristics of long communication distance and large communication capacity, has attracted more and more attention. With the continuous progress of optical fiber communication technology, the methods of eavesdropping are also increasing, which makes researchers must pay attention to improving its security. Physical layer encryption is one of the important means to improve the security of communication system, and DNA encryption algorithm, as a new encryption method with high encryption degree in physical layer encryption algorithm, has a high research value. This report first introduces the research background of CO-OFDM system and DNA algorithm, then discusses and designs the idea of DNA encryption algorithm for CO-OFDM system, and finally focuses on the structure of CO-OFDM system based on DNA encryption, uses MATLAB and optisystem software to simulate the system, analyzes the output results of the simulation, and in view of the shortcomings of the current system, the direction of further optimization of the system is put forward.