Three-dimensional dynamic probabilistic shaping high-security transmission scheme based on dual physical layer encryption for seven-core fibers

In this paper, a carrier-less amplitude and phase modulation passive optical network (CAP-PON) scheme is proposed based on dynamic probabilistic shaping (DPS) and Rubik's cube encryption in optical access networks.The key is generated from a novel five-dimensional entangled chaos model for dynamic probabilistic shaping and Rubik's cube encryption.To verify the performance of the encryption scheme, an experimental demonstration of 70 Gb/s (7 10 Gb/s) encrypted DPS-3D-CAP signal transmission over 2 km weakly coupled 7-core fiber is performed.The key space of the new five-dimensional entangled chaos model reaches 10 173 , and the interference level reaches 100%.Experimental results show that the receiver sensitivity increases by 1.47 dB compared to the conventional uniform 3D-CAP due to the introduction of dynamic probabilistic shaping.