Long-Range Optical Wireless Information and Power Transfer

TL;DR

This paper introduces a long-range optical wireless system that combines high-power energy transfer and high-rate data communication using resonant beams and retro-reflectors, suitable for IoT applications.

Contribution

It proposes a novel resonant beam system with a comprehensive model for simultaneous wireless information and power transfer over long distances.

Findings

Supplies up to 9 W power at 20 m distance

Achieves 18 bit/s/Hz spectral efficiency

Demonstrates effective long-range SWIPT performance

Abstract

Simultaneous wireless information and power transfer (SWIPT) is a remarkable technology to support both the data and the energy transfer in the era of Internet of Things (IoT). In this paper, we proposed a long-range optical wireless information and power transfer system utilizing retro-reflectors, a gain medium, a telescope internal modulator to form the resonant beam, achieving high-power and high-rate SWIPT. We adopt the transfer matrix, which can depict the beam modulated, resonator stability, transmission loss, and beam distribution. Then, we provide a model for energy harvesting and data receiving, which can evaluate the SWIPT performance. Numerical results illustrate that the proposed system can simultaneously supply 0$\sim$9 W electrical power and 18 bit/s/Hz spectral efficiency over 20 m distance.