Appl Opt. 2023 Mar 20;62(9):2367-2375. doi: 10.1364/AO.451422.
Indoor free-space optical communication (FSO) provides orders of magnitude larger usable bandwidth compared to radio-frequency links but suffers from an intrinsic trade-off between areal coverage and received power. In this paper, we report a dynamic indoor FSO system enabled by a line-of-sight optical link featuring advanced beam control capabilities. The optical link herein utilizes a passive target acquisition scheme by combining a beam steering and beam shaping transmitter with a receiver adorned with a ring-shaped retroreflector. When controlled by an efficient beam scanning algorithm, the transmitter is capable of locating the receiver with millimeter-scale accuracy over a distance of 3 m with a full viewing angle of ±11.25 in the vertical direction and ±18.75 in the horizontal direction within 1.162±0.005, regardless of the receiver's positions. We also demonstrate 1 Gbit/s data rate with bit error rates below 4×10 using an 850 nm laser diode with only 2 mW of output power.
室内自由空间光通信 (FSO) 提供的可用带宽比射频链路大几个数量级，但在覆盖面积和接收功率之间存在固有权衡。在本文中，我们报告了一种通过具有先进光束控制能力的视距光学链路实现的动态室内 FSO 系统。本文中的光学链路利用光束转向和光束整形发射器与接收器上的环形反射器相结合的被动目标捕获方案。当由高效光束扫描算法控制时，发射器能够以毫米级的精度在 3m 的距离内定位接收器，在垂直方向上的全视角为±11.25，在水平方向上为±18.75，而与接收器的位置无关。我们还使用输出功率仅为 2mW 的 850nm 激光二极管演示了 1Gbit/s 的数据速率，误码率低于 4×10。
