Old news from a month ago but interesting.
"Reading the electrical field of light is difficult with traditional tools because of the very high frequency involved. According to [Michael Chini], who worked on the new instrument, the oscilloscope can be as much as 10,000 times faster as a conventional one."
Comment from Hackaday on article :
"Unless you’re moving high-speed data across fiber optic, we aren’t sure you really need this."
https://phys.org/news/2021-12-team-world-optical-oscilloscope.html