Resonant beam communications (RBCom), which adopt oscillating photons between two separate retroreflectors for information transmission, exhibit potential advantages over other types of wireless optical communications (WOC). However, echo interference generated by the modulated beam reflected from the receiver affects the transmission of the desired information. To tackle this challenge, a synchronization-based point-to-point RBCom system is proposed to eliminate the echo interference, and the design for the transmitter and receiver is discussed. Subsequently, the performance of the proposed RBCom is evaluated and compared with that of visible light communications (VLC) and free space optical communications (FOC). Finally, future research directions are outlined and several implementation challenges of RBCom systems are highlighted.

翻译：谐振光束通信（RBCom）利用两个分离后向反射器之间的振荡光子进行信息传输，与其他类型无线光通信（WOC）相比展现出潜在优势。然而，经接收端反射的调制光束产生的回波干扰会影响目标信息的传输。为解决这一挑战，本文提出一种基于同步的点对点RBCom系统以消除回波干扰，并讨论了发射端与接收端的设计方案。随后，对提出的RBCom系统性能进行了评估，并与可见光通信（VLC）及自由空间光通信（FOC）进行了对比。最后，展望了未来研究方向，并指出了RBCom系统面临的若干实现挑战。