This study presents the design and analysis of energy-efficient visible light communication-based downlink and uplink using a thin-film corner cube retroreflector (TCCR). The uplink establishment from the user device (UD) to base station (BS) is achieved with the retroreflection of the downlink light beams using TCCR in UD. It eliminates the requirement of active optical source in the UD that reduces the power consumption for communication from the battery-constrained devices. Additionally, the photoelectric effect-based energy harvesting from lighting sources is also incorporated in the UD. By utilising the thin-film deposition of photosensitive alkali metals Na, K, Rb, and Cs, light energy has been harvested, and the harvested energy is utilised in the UD for the uplink modulation process. It makes the real self-sustainable communication towards the battery-less execution of internet of things (IoT). The proposed system offers the downlink and uplink for the distance of 2.15 m with the data rates of 10 Gbps and 1 kbps, respectively. The maximum harvested energy from the 18 W optical source by using the 100 nm Cs-TCCR is 104.40 µJ, and it can serve the energy consumption of the uplink modulator to transmit the UD data to the BS.

中文翻译：

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使用薄膜角锥后向反射器的节能双向可见光通信，实现自立式物联网

这项研究提出了使用薄膜角锥后向反射器（TCCR）的基于节能型可见光通信的下行链路和上行链路的设计和分析。使用UD中的TCCR，通过下行链路光束的回射，可以实现从用户设备（UD）到基站（BS）的上行链路建立。它消除了UD中有源光源的需求，从而降低了来自受电池限制的设备进行通信的功耗。此外，UD中还包含了从光源收集基于光电效应的能量的功能。通过利用光敏碱金属Na，K，Rb和Cs的薄膜沉积，已经收集了光能，并且所收集的能量在UD中用于上行链路调制过程。它实现了真正的自我可持续的通信，实现了物联网（IoT）的无电池执行。拟议的系统提供距离为2.15 m的下行链路和上行链路，数据速率分别为10 Gbps和1 kbps。通过使用100 nm Cs-TCCR，从18 W光源获得的最大能量为104.40 µJ，它可以服务于上行链路调制器的能耗，从而可以将UD数据发送到BS。