空间分离激光谐振腔后向反射光束通信
Retro-Reflective Beam Communications with Spatially Separated Laser Resonator
摘要：
利用红外或可见光作为载体的光无线通信（OWC）在6 G研究中受到极大关注。共振波束通信（RBCom）是一种同时满足非机械移动性和高信噪比要求的光通信技术。它具有自对准功能，因此避免了定位和指向操作。然而，RBCom经受回波干扰。本文提出了一种基于二次谐波产生的无回波干扰RBCom系统设计。发射器和接收器构成一个空间分离的激光谐振腔，其中形成回射谐振光束并自动跟踪接收器。这种结构为信道提供了波束形成和对准的自适应能力，这类似于智能反射表面（IRS）增强通信的概念，但没有硬件和软件控制器。此外，我们建立了一个分析模型来评估波束半径，波束功率，和信道容量。结果表明，与现有的OWC技术相比，该系统在10 Gbit/s以上的传输距离更长，光束直径更小。
英文摘要：
Optical wireless communications (OWC) utilizing infrared or visible light as the carrier attracts great attention in 6G research. Resonant beam communications (RBCom) is an OWC technology which simultaneously satisfies the needs of non-mechanical mobility and high signal-to-noise ratio~(SNR). It has the self-alignment feature and therefore avoids positioning and pointing operations. However, RBCom undergoes echo interference. Here we propose an echo-interference-free RBCom system design based on second harmonic generation. The transmitter and the receiver constitute a spatially separated laser resonator, in which the retro-reflective resonant beam is formed and tracks the receiver automatically. This structure provides the channel with adaptive capability in beamforming and alignment, which is similar to the concept of intelligent reflecting surface (IRS) enhanced communications, but without hardware and software controllers. Besides, we establish an analytical model to evaluate the beam radius, the beam power, and the channel capacity. The results show that our system achieves longer distance and smaller beam diameter for the transmission beyond 10 Gbit/s, compared with the existing OWC technologies.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
