This article presents the design, implementation, and characterisation of compact fiber-wireless-fiber (FWF) localisation and beam-steering terminals, which provide a bi-directional free-space connection between fiber optic transceivers. The use of simple mirror based beam-steering, with high localisation accuracy in both steering axes enables ultra-high data rate transmission and practical indoor coverage. The auto-aligned terminals have a tracking accuracy of 0.02o, a full angle field-of-view (FoV) of 50o, a tracking latency of 200 ms, and work at wavelengths between 1300–1700 nm. In an offline data processing experimental setup, 1 Tbit/s free-space transmission capability is demonstrated over a 2.54 m2 coverage area using ten wavelength division multiplexed PAM-4 signals. Further, full-duplex, real-time, data transmission using off-the-shelf small form-factor pluggable (SFP) optical transceivers is also demonstrated for virtual reality (VR) application. Here, using standard 10 G SFP+ transceivers without the use of any pre/post optical amplification, the auto-aligned FWF terminals achieve 4.9 m2 localisation and 3.14 m2 bidirectional communications coverage over a range of $\sim$4 m.

中文翻译：

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用于光纤-无线-光纤链路的 Terabit/s 紧凑型定位和波束控制终端的设计和表征

本文介绍了紧凑型光纤无线光纤 (FWF) 定位和波束控制终端的设计、实现和表征，它们提供了光纤收发器之间的双向自由空间连接。使用简单的基于反射镜的光束转向，在两个转向轴上都具有高定位精度，可实现超高数据速率传输和实用的室内覆盖。自动对齐终端的跟踪精度为 0.02o，全角视场 (FoV) 为 50o，跟踪延迟为 200 ms，工作波长在 1300-1700 nm 之间。在离线数据处理实验设置中，使用十个波分复用 PAM-4 信号在 2.54 平方米的覆盖区域内展示了 1 Tbit/s 的自由空间传输能力。此外，全双工、实时、还针对虚拟现实 (VR) 应用演示了使用现成的小型可插拔 (SFP) 光收发器进行数据传输。在这里，使用标准 10 G SFP+ 收发器而不使用任何前/后光放大，自动对齐的 FWF 终端在 $\sim$4 m 的范围内实现了 4.9 m2 的定位和 3.14 m2 的双向通信覆盖。