近日，沙特阿拉伯阿卜杜拉国王科技大学的Jose Ilton De Oliveira Filho及其研究团队取得一项新进展。经过不懈努力，他们实现可重构的MIMO基自供电无电池光通信系统。相关研究成果已于2024年8月28日在国际知名学术期刊《光：科学与应用》上发表。

在此，该研究团队设计了一种基于多路复用SLIPT的系统，该系统包括一个按3×3配置排列的光电探测器（PD）阵列。该系统能够在解码来自多个光束的信息的同时收获能量。光电探测器可以在光电导模式和光伏模式之间迅速切换，以最大化信息传输速率并提供按需的能量收集。此外，他们还研究了使用阵列中特定象限的一组光电探测器解码信息和收获能量的能力，以实现光束跟踪和空间多样性。

为了实现更高的数据速率和更高的功率收集，研究人员分别探索了较小和较大版本的设计。研究人员报道了一种自供电设备，该设备在单输入单输出（SISO）配置下可实现25.7Mbps的总数据速率，在多输入多输出（MIMO）配置下可实现85.2Mbps的净数据速率。在标准AMT1.5光照下，该设备可收获高达87.33mW的能量，大约是维持整个系统所需功率的两倍。这项研究工作为在恶劣环境中部署自主物联网设备及其在太空应用中的潜在用途铺平了道路。

据悉，与光无线通信共存的同时光波信息与能量传输（SLIPT）技术，在确保连接性的同时，为远程物联网（IoT）设备提供持续充电的巨大潜力。将SLIPT与全向接收器相结合，人们可以在保持稳定连接的同时，利用更高的功率预算，这是光无线通信系统面临的一大挑战。

附：英文原文

Title: Reconfigurable MIMO-based self-powered battery-less light communication system

Author: De Oliveira Filho, Jose Ilton, Trichili, Abderrahmen, Alkhazragi, Omar, Alouini, Mohamed-Slim, Ooi, Boon S., Salama, Khaled Nabil

Issue&Volume: 2024-08-28

Abstract: Simultaneous lightwave information and power transfer (SLIPT), co-existing with optical wireless communication, holds an enormous potential to provide continuous charging to remote Internet of Things (IoT) devices while ensuring connectivity. Combining SLIPT with an omnidirectional receiver, we can leverage a higher power budget while maintaining a stable connection, a major challenge for optical wireless communication systems. Here, we design a multiplexed SLIPT-based system comprising an array of photodetectors (PDs) arranged in a 3×3 configuration. The system enables decoding information from multiple light beams while simultaneously harvesting energy. The PDs can swiftly switch between photoconductive and photovoltaic modes to maximize information transfer rates and provide on-demand energy harvesting. Additionally, we investigated the ability to decode information and harvest energy with a particular quadrant set of PDs from the array, allowing beam tracking and spatial diversity. The design was explored in a smaller version for higher data rates and a bigger one for higher power harvesting. We report a self-powering device that can achieve a gross data rate of 25.7Mbps from a single-input single-output (SISO) and an 85.2 Mbps net data rate in a multiple-input multiple-output (MIMO) configuration. Under a standard AMT1.5 illumination, the device can harvest up to 87.33mW, around twice the power needed to maintain the entire system. Our work paves the way for deploying autonomous IoT devices in harsh environments and their potential use in space applications.

DOI: 10.1038/s41377-024-01566-3

Source: https://www.nature.com/articles/s41377-024-01566-3