High security OFDM-PON based on an iterative cascading chaotic model and 4-D joint encryption

Abstract Optical access network security issues have become more prominent as the number of users and the desire for colossal network capacity increases dramatically. This paper proposes a secure method for data transmission by performing encryption at the physical layer for orthogonal frequency division multiplexing passive optical network (OFDM-PON), based on a combination of probabilistic shaping (PS) and 4-D iterative cascading chaotic scrambling, adopting improved-Logistic and delay-tent-sine double chaotic map. The chaos scrambling method uses an iteration method to generate scrambling vectors and encrypts the transmitted signal as needed, enhancing the security of the physical layer. The mathematical model for achieving secure transmission in four dimensions is presented and validated by the experimental results employing double chaotic map scrambling. PS-16-QAM based 16.48 Gb/s data is successfully encrypted using the proposed model and is transmitted across a 25 km fiber span using standard single-mode fiber. We also discussed the bit error rate and the beneficial effects of PS on the OFDM-PON system. The results show that the proposed OFDM-PON has high sensitivity and security, and PS technology has a 1 dB gain on EBR. This scheme has very reliable security performance and can improve system performance, which can be widely used in secure OFDM-PON systems.