Venugopalan Abhinand, Singh Karanveer, Meier Janosch, Schneider Thomas
THz-Photonics Group, Technische Universität Braunschweig, Braunschweig, Germany.
Commun Eng. 2025 Jan 29;4(1):13. doi: 10.1038/s44172-025-00351-3.
New applications such as the Internet of Things, autonomous driving, Industry X.0 and many more will transmit sensitive information via fibers and over the air with envisioned data rates beyond terabits per second. Therefore, the encryption has to be simple, fast and spectrally efficient, so that the power consumption and latency are low and the scarce bandwidth is not wasted. Various encryption schemes, based on mathematical algorithms, quantum theory, chaos communication or spectral spreading below the noise level have been explored. Besides power, spectral efficiency and latency, most of these approaches face additional challenges such as limited data rates, compatibility issues with communication standards and integration. Here, we propose a signal theory based method that enables the encryption of super-signals with bandwidths of hundreds of gigahertz without any additional bandwidth. In proof-of-concept experiments we demonstrate the encryption of a 270 GBd faster than Nyquist super-signal in a 252.4 GHz bandwidth. The encryption is simple, fast and power efficient, and offers a solution for secure data transmission in existing and future communication networks.
诸如物联网、自动驾驶、工业X.0等新应用，以及更多其他应用，将以每秒超过太比特的数据速率通过光纤和无线方式传输敏感信息。因此，加密必须简单、快速且频谱高效，以使功耗和延迟较低，且不浪费稀缺的带宽。人们已经探索了各种基于数学算法、量子理论、混沌通信或低于噪声水平的频谱扩展的加密方案。除了功耗、频谱效率和延迟外，这些方法大多还面临其他挑战，如数据速率有限、与通信标准的兼容性问题以及集成问题。在此，我们提出一种基于信号理论的方法，该方法能够在不占用任何额外带宽的情况下，对带宽达数百吉赫兹的超信号进行加密。在概念验证实验中，我们演示了在252.4吉赫兹带宽内对一个270GBd的比奈奎斯特超信号更快的信号进行加密。该加密方法简单、快速且节能，为现有和未来通信网络中的安全数据传输提供了一种解决方案。
