Abstract
In this paper, a high-security chaos encryption with dynamic probability for 16-carrier-less amplitude/phase (CAP) PON is proposed by using two-layer chaos map with feedforward neural network-based XOR operator (FNNXOR). The inner chaotic map is divided into several time slots, and the key of each time slot is different and dynamically allocated by outer layer of 2-dimensional logistic adjusted sine (2D-LASM) map. And the 16-CAP signal is encrypted by (CCDM) and XOR operator to realize dynamic probability and flexible rate. The ONU checks out and compares the hash value sent by OLT, so as to achieve slot synchronization. A 4 Gb/s multi-slot chaos encrypted 16-CAP signal with dynamic probability is transmitted through a 25-km standard single mode fiber (SSMF). The proposed scheme has a high anti-hacking capability and good performance under key leakage. Compared with conventional chaos encrypted 16-CAP signals, the probabilistic shaped signals exhibit better tolerance towards low received optical power. These experimental results verify that the proposed approach is a promising candidate for encryption in access network systems.
Highlights
With the rapid development of various cutting-edge technologies, more and more attention are paid to the transmission rate and security performance of communication systems
We have proposed a high-security chaos encryption with dynamic probability for 16-carrier-less amplitude/phase (CAP) modulated passive optical network (PON)
Dynamic probability enabled chaos encrypted 16-CAP has a two-layer encryption which is divided into logistic chaos map and 2-dimensional logistic adjusted sine map (2D-LASM)
Summary
With the rapid development of various cutting-edge technologies, more and more attention are paid to the transmission rate and security performance of communication systems. Due to the dramatic increase in network usage, it is important to improve the transmission performance of communication systems and properly protect communication securities over these networks. Chaotic encryption is an effective method to protect signal security and confidentiality at the physical layer. An approach for peak-to-average-power ratio reduction and security improvement in an orthogonal frequency division multiplexing (OFDM) passive optical network is proposed by employing optimum block dividing with 2-dimensional logistic adjusted sine map (2D-LASM) and dynamic key assignment technique [5]. To our best knowledge, we firstly propose and demonstrate a high-security chaos encryption with dynamic probability in 16-carrier-less amplitude/phase (CAP) modulated PON. By utilizing dynamic probability enabled chaos encryption, flexible transmission rate is achieved, and the system performance under low received optical power is improved. An experiment of 4 Gb/s 16CAP signal adopting dynamic probability chaos encryption with dynamic probability is successfully demonstrated over 25-km SSMF
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