Opt Express. 2023 Feb 13;31(4):6659-6674. doi: 10.1364/OE.483007.
This paper proposes a 3-dimensional (3D) carrier-less amplitude and phase modulation (CAP) based on a pyramid constellation design encryption scheme for 7-core fiber in passive optical network (PON). The chaos sequences generated by the 4D hyperchaotic system are applied to produce the masking factor, and the pyramid Rubik's cube rotation rules are used to flip and rotate the constellation points. To verify the performance of the proposed 3D CAP-PON system, 25.5Gb/s encrypted Pyraminx-3D-CAP-16 signal transmission over 2 km 7-core fiber is experimentally demonstrated. Compared with the traditional 3D-CAP-16 signal, the proposed Pyraminx-3D-CAP-16 signal achieves a sensitivity gain of 0.5 dB under the limit of hard decision forward error correction (HD-FEC) 3.8 × 10. Compared with the Pyraminx-3D-CAP-16 signal, the encrypted Pyraminx-3D-CAP-16 signal has little difference from that before encryption, which has a great application prospect in the physical layer security enhancement of the 3D-CAP-PON system.
本文提出了一种基于金字塔星座设计的三维无载波幅度和相位调制（CAP）加密方案，用于无源光网络（PON）中的 7 芯光纤。该方案利用 4D 超混沌系统产生的混沌序列来生成掩蔽因子，并采用金字塔魔方旋转规则来翻转和旋转星座点。为了验证所提出的 3D CAP-PON 系统的性能，在 2km 7 芯光纤上进行了 25.5Gb/s 加密 Pyraminx-3D-CAP-16 信号传输实验。与传统的 3D-CAP-16 信号相比，在硬判决前向纠错（HD-FEC）3.8×10 的极限下，所提出的 Pyraminx-3D-CAP-16 信号实现了 0.5dB 的灵敏度增益。与 Pyraminx-3D-CAP-16 信号相比，加密的 Pyraminx-3D-CAP-16 信号与加密前的信号几乎没有区别，这在增强 3D-CAP-PON 系统的物理层安全性方面具有很大的应用前景。
