This impressive feat was accomplished by Zhixin Liu and his team at University College London (UCL). The team purportedly used a combination of radio waves and light-based communication across the broadest spectrum of frequencies ever recorded, ranging from 5 GHz to 150 GHz.
The researchers used a 145 GHz bandwidth wireless transmission using orthogonal frequency-division multiplexing (OFDM) for the test. This setup takes advantage of different transmission operations for various frequency ranges. The high-frequency mm-wave bands, including the 75 - 150 GHz bands, were generated by "mixing optically modulated signals with frequency-locked lasers on high-speed photodiodes."
"By frequency-locking two pairs of narrow linewidth lasers and referring to a common quartz oscillator, the researchers generated W-band and D-band signals with stable carrier frequency and reduced phase noise compared to free-running lasers, maximizing the use of spectrum.
By using OFDM format and bit loading, the researchers achieved a 938 Gbps transmission data rate with less than a 300 MHz gap between different RF and mm-wave bands."
https://www.tomshardware.com/service-providers/6g-tests-reach-a-blisteringly-quick-938-gb-s-transmission-rate-5000x-faster-than-5g
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