High-Security OFDM-OAM Optical Transmission Scheme Based on Quad-Wing Ultra-Chaotic Encryption

Abstract

We propose a high-security hyperchaotic orthogonal frequency division multiplexing (OFDM) encryption scheme based on the orbital angular momentum system, and our research focuses on the security and high-order modulation of the orbital angular momentum (OAM)system. In order to effectively prevent violent decryption by eavesdroppers, we adopt a high security Zhan's hyperchaotic model. In the experiments, the high security performance of the proposed encryption scheme is verified by the OAM optical transmission platform, the proposed encryption scheme has a large key space of 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">191</sup> , and it is demonstrated that the high-order spatial optical modulation has a small impact on the bit error rate (BER) of the OAM system within the forward error correction (FEC) threshold. The experimental results show that the proposed encryption scheme significantly improves the security performance of OAM spatial optical transmission, and is a promising candidate for the next-generation high-security OAM high-order multiplexed transmission system.