Mode-Oriented Permutation Cipher Encryption and Passive Signal Switching Based on Multiobjective Optimized Silicon Subwavelength Metastructures
Author(s): Jia, H (Jia, Hao); Yang, SL (Yang, Shanglin); Zhou, T (Zhou, Ting); Zhang, L (Zhang, Lei); Wang, T (Wang, Tao); Chen, HX (Chen, Haoxiang); Yang, JH (Yang, Jianhong); Yang, L (Yang, Lin)
Source: ACS PHOTONICS Volume: 7 Issue: 8 Pages: 2163-2172 DOI: 10.1021/acsphotonics.0c00640 Published: AUG 19 2020
Abstract: The rapid development of silicon photonics provides the possibility for various applications. In this paper, we utilize silicon subwavelength metastructures as hardware solutions for permutation cipher and signal switching. Based on the intrinsic similarities of behavior at the level of the mathematical model, we use the physical parameters of optical systems as carriers to link the feature parameters of the problems. By manipulating the evolution of optical parameters through a device, we can solve these issues in the optical field. The orthogonal mode is widely used in multimode systems. We mapped the sequence of sliced messages and signal channels to the mode orders, thus, the permutation cipher encryption, and passive signal switching problems can be refined to the arbitrary transformation of mode orders. We propose a structure fulfilling the functionality and implement the multiobjective inverse-design method to optimize the device. As a proof of concept, we adopt four modes and realize the mode transformation of TE0, TE1, TE2, and TE3 to TE2, TE0, TE3, and TE1 at a footprint cost of 4 mu m x 3.4 mu m. The simulated insertion losses are lower than 1.7 dB at 1525-1565 nm. The measured insertion losses for the fabricated device are lower than 3.1 dB. Then we demonstrate the permutation cipher encryption with a 12.5 Gbps message-rate and the passive signal switching with 40 Gbps OOK and 32G Baud PAM-4 signals. The methodology can fully release the advantages and potentials of subwavelength structures and provide a powerful tool for solving interdisciplinary problems via optics.
Accession Number: WOS:000563072500034
ISSN: 2330-4022
Full Text: https://pubs.acs.org/doi/10.1021/acsphotonics.0c00640