Time-Domain Analysis for Resonant Beam Charging and Communications With Delay-Divide Demodulation

TL;DR

This paper develops a time-domain simulation for resonant beam systems used in wireless charging and communication, introduces a delay-divide demodulation method to mitigate echo interference, and verifies its effectiveness through simulation.

Contribution

It presents a novel simulation algorithm for resonant beam dynamics and proposes a delay-divide demodulation technique to improve system performance.

Findings

Simulation results agree with theoretical calculations.

Delay-divide demodulation effectively reduces echo interference.

Resonant beam system with the proposed method is feasible and efficient.

Abstract

Laser has unique advantages such as abundant spectrum resources and low propagation divergence in wireless charging and wireless communications, compared with radio frequency. Resonant beams, as a kind of intra-cavity laser beams, have been proposed as the carrier of wireless charging and communication, as it has unique features including high power, intrinsic safety, and self-aligned mobility. However, this system has problems such as intra-cavity echo interference and power fluctuation. To study the time-domain behavior of the resonant beam system, we create a simulation algorithm by discretizing the laser rate equations which model the dynamics of the excited atom density in the gain medium and the photon density in the cavity. The simulation results are in good agreement with theoretical calculation. We also propose a delay-divide demodulation method to address the echo interference issue, and use the simulation algorithm to verify its feasibility. The results show that the resonant beam charging and communication system with the proposed demodulator is feasible and performs well. The analysis in this work also helps researchers to deeply understand the behavior of the resonant beam system.