Field of View Expansion for Resonant Beam Information and Power Transfer

TL;DR

This paper introduces a telescope-enhanced resonant beam system that significantly expands the field of view for wireless power and information transfer, enabling more seamless IoT connectivity over larger movement ranges.

Contribution

The paper presents a novel telescope-based design that triples the field of view of resonant beam systems for wireless power transfer at meter distances.

Findings

FoV expanded to 28 degrees over 1 meter distance

Experimental validation of the telescope-based RBS

FoV increase is about three times compared to traditional designs

Abstract

Simultaneous wireless information and power transfer (SWIPT) leverages lightwave as the wireless transmission medium, emerging as a promising technology in the future Internet of Things (IoT) scenarios. The use of retro-reflectors in constructing spatially separated laser resonators (SSLR) enables a self-aligning wireless transmission system with the self-reproducing resonant beam, i.e. resonant beam system (RBS). However, it's effective Field of View (FoV) is physically limited by the size of retroreflectors and still requires significant improvement. This restricts the transmitter from providing seamless wireless connectivity and power supply to receivers within a large dynamic movement range. In this paper, we propose an FoV-enlarged resonant beam system operating at a meter distance by incorporating a telescope. The telescope plays a crucial role in minimizing the extra loss inflicted on the gain medium, which typically arises from the deviation of the resonant beam within the cavity. Further, we construct the proposed telescope-based RBS and experimentally demonstrate that the design could expand the FoV to 28$^\circ$ over 1 m transmission distance is about triple that of the ordinary RBS design.