Miniaturized free-space optical breakthrough unlocks high-speed wireless communication anywhere

https://techxplore.com/news/2023-10-miniaturized-free-space-optical-breakthrough-high-speed.html

"pair of FSO devices. Each FSO 45 cm × 40 cm × 35 cm, 9.5 kg, 10 W, each houses optical transceiver, acquisition, pointing, and tracking device, and control... low-diffraction, efficient 4-stage closed-loop feedback control... tracking through integrating multiple sensors and algorithms, 10 minute tracking, tracking error >=3 μrad, link loss 13.7 dB over the 1-km link... bidirectional data rates 9.27 Gbps... 1 km effective distance, also tested 4 km, where average loss increased to 18 dB, but due to a foggy test environment"