Perovskite is an emerging low-cost and high-quality material, that show significant potential to revolutionize photovoltaic and lighting sectors in Organic and Large Area Electronics (OLAE) devices. Their simple and inexpensive processing methods, such as solution-based synthesis and printing, make them attractive for flexible and lightweight electronic devices. In this work, perovskite suitability has been tested for telecommunication applications, particularly Li-Fi links. The perovskite devices were integrated into a telecom system, including an FPGA handling signal processing, LED array, analog transmitter circuitry, and driving electronics for the perovskite photodiode. 4-PPM modulation format has been adopted due to resilience in low SNR. The purpose is to thoroughly characterize the setup to assess the suitability of perovskite devices for Li-Fi scenarios or combined PV and Li-Fi usage. This research aims to advance the application of perovskites in telecommunication and expand their potential in various electronic devices.
Physical Layer Security (PLS) exploits characteristics and properties of the physical layer for data encryption and supplements conventional cryptography for enhanced overall security. Most of the PLS methodologies rely on the (statistical) characteristics of the transmission channel to either generate secure encryption keys, or to exploit them together with other physical layer characteristics (i.e. advanced modulation schemes) for secure transmission. However, these approaches often lead to increased complexity and therefore become impractical for actual system implementation. Recent advancements in Quantum Key Distribution (QKD) systems allow for the utilization of ultra-secure and robust high-rate key exchange. In this work, we propose and describe practical techniques for exploiting and seamlessly integrating highrate QKD keys to encrypt modulation parameters and quantities of conventional modulation schemes like M-QAM, DMT and OFDM of communication links. Moreover, we present transmission scenarios, integrating QKD-PLS in free space optics links, together with their numerical evaluation. The main advantage of QKD exploitation to the proposed solutions comes from the seamless and transparent integration and application of high-rate keys which can either be used in their original form or feed a pseudo-random number generator, to modify the modulation properties/symbols in very high rates, such that eavesdropping and decoding of the encrypted information becomes almost impossible. Additionally, we present the architecture of a real time practical system utilizing and seamlessly integrating the QKD keys into transceiver links to form a robust and ultra-secure PLS ecosystem.
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