Secure optical communication based on dual-random chaotic phase encryption using synchronized multi-mode Fabry-Perot lasers

To address the rapid growing demand for physical layer secure optical communication, we propose and experimentally demonstrate a novel dual-random chaotic phase scrambling scheme based on synchronized multi-mode Fabry-Perot lasers (FP) for physical-layer security enhancement. The proposed scheme provides both temporal scrambling and chaotic phase encryption by encrypting both the amplitude and phase of a confidential signal in two protection layers, enhancing transmission confidentiality and demonstrating flexibility for both amplitude- and phase-modulated signals. Based on common-driving induced synchronization of FP lasers, dual-random chaotic phase encryption and decryption are successfully achieved by utilizing different multi-longitudinal modes. A proof-of-principle demonstration is presented by secure transmission of 25 Gb/s on-off-keying (OOK) and 10 Gb/s differential-phase shift-keying (DPSK) signals over a 40 km single mode fiber link. The proposed scheme provides a promising solution for improving the physical-layer security of future high speed secure optical communication systems.