This paper introduces an effective technique for bridging free-space optical (FSO) communication between end-to-end nodes with obstructed direct line-of sight (LOS) by incorporating a steerable mirror-and-lens-assisted (MLA) reflector assembly. The consistency of the proposed MLA-assisted FSO system is then experimentally evaluated and contrasted against a plane mirror (PM) reflector over a test-bed link set in a laboratory-fostered dusty environment for analyzing the system performance in terms of the received beam irradiance, received signal quality and noise-inflicted signal distortions. Furthermore, an intensity-dependent steerable MLA system is implemented to cater for the beam misalignment errors during the FSO link operation. It is observed that the proposed MLA assembly, in contrast to the PM reflector, can effectively harvest and focus the dust-induced scattered information-laden laser beam to a narrow-beam spot with intense irradiance level at the receiver aperture. Finally, the signal eye diagram is obtained for analyzing the signal quality in the presence and absence of background light. Based on the experimental study, it is apparent that the MLA reflectors not only aids in establishing a reliable direct LOS-obstructed FSO link but also effectively mitigates the dusty channel-induced beam fading effect and enhances the system immunity to noise and jitter effects.

中文翻译：

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视距受限的FSO链路中的可控反射镜辅助通信，可最佳地减轻粉尘引起的信号衰减

本文介绍了一种有效的技术，通过结合可转向的镜面和透镜辅助（MLA）反射镜组件，可以在具有直接视线受阻的端到端节点之间架起自由空间光学（FSO）通信。然后，通过实验评估建议的MLA辅助FSO系统的一致性，并在实验室尘土飞扬的环境中，通过测试平台链接上的平面镜（PM）反射器进行对比，以根据接收的光束辐照度分析系统性能，接收信号质量和噪声引起的信号失真。此外，实现了依赖于强度的可操纵MLA系统，以在FSO链接操作过程中解决光束失准误差。可以看出，与PM反射器相比，建议的MLA组件，可以有效地收集尘埃引起的散布有信息的激光束，并将其聚焦到在接收器孔径处具有高辐照度的窄光束点。最后，获得信号眼图以分析在有和没有背景光的情况下的信号质量。根据实验研究，很明显，MLA反射器不仅有助于建立可靠的直接LOS阻塞的FSO链路，而且还可以有效减轻尘土通道引起的光束衰落效应，并增强系统对噪声和抖动效应的抵抗力。