Ultrahigh-order QAM secure transmission based on delta-sigma modulation using discrete memristive-enhanced chaos

This Letter proposes a high -security and high -order signal transmission method that is based on delta -sigma modulation (DSM) and discrete memristive-enhanced chaos (DMEC). We employ the DMEC for the encryption of DSM signals to achieve a key space of 10(98) in size. Moreover, we demonstrated a high -security transmission of 16384QAM signals using the DSM over a 25 km single -mode fiber in the intensity -modulated direct detection (IMDD) system. The experimental results show that the proposed ultrahigh -order transmission scheme based on DMEC and DSM guarantees high signal transmission performances with improved security and a key sensitivity level of 10(-17). (c) 2024 Optica Publishing Group