Secure strategy for OFDM-PON using digital chaos algorithm with fixed-point implementation

• Main Authors: Li, Shanshan, Cheng, Mengfan, Deng, Lei, Fu, Songnian, Zhang, Minming, Tang, Ming, Shum, Ping, Liu, Deming
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2020
• Subjects: Engineering::Electrical and electronic engineering; Chaos; Orthogonal Frequency Division Multiplexing Passive Optical Network (OFDM-PON)
• Online Access: https://hdl.handle.net/10356/139393
• Institution: Nanyang Technological University

We propose a scheme for security improvement in the orthogonal frequency division multiplexing (OFDM) passive optical network based on a fixed-point digital chaos algorithm with a low computational precision. The dynamical degradation problem is improved by introducing the transmitted data as a perturbation source. In our demonstration, aperiodic key streams are generated from a fixed-point chaos with its trajectory disturbed by the upstream data, and then used to encrypt the downstream data. A 7.64-Gbps encrypted OFDM signal is successfully transmitted over a 25-km standard single mode fiber. The experimental results indicate that the proposed scheme suggests an effective and promising solution to meet the demands for low implementation complexity and high security level.