Mobile Optical Communications Using Second Harmonic of Intra-Cavity Laser

TL;DR

This paper introduces an intra-cavity second-harmonic-generation resonant beam communication system that simplifies design and enhances energy efficiency for high-rate mobile optical wireless communication, addressing previous system complexities.

Contribution

It proposes a novel intra-cavity SHG RBCom system that improves energy efficiency and simplifies design compared to external-cavity systems.

Findings

Energy consumption is reduced with the intra-cavity design.

System maintains high channel capacity.

Analytical model confirms efficiency improvements.

Abstract

Optical wireless communication (OWC) meets the demands of the future six-generation mobile network (6G) as it operates at several hundreds of Terahertz and has the potential to enable data rate in the order of Tbps. However, most beam steering OWC technologies require high-accuracy positioning and high-speed control. Resonant beam communication (RBCom), as one kind of non-positioning OWC technologies, has been proposed for high-rate mobile communications. The mobility of RBCom relies on its self-alignment characteristic where no positioning is required. In a previous study, an external-cavity second-harmonic-generation (SHG) RBCom system has been proposed for eliminating the echo interference inside the resonator. However, its energy conversion efficiency and complexity are of concern. In this paper, we propose an intra-cavity SHG RBCom system to simplify the system design and improve the energy conversion efficiency. We elaborate the system structure and establish an analytical model. Numerical results show that the energy consumption of the proposed intra-cavity design is reduced to reach the same level of channel capacity at the receiver compared with the external-cavity one.