Light years ahead: The advanced chip shaping an ultrafast tech future

https://techxplore.com/news/2022-12-years-advanced-chip-ultrafast-tech.html

"fractional delay method... added common reference path... enables stable and accurate measurements of lengths (phases, time delays) and losses of workhorse paths... separate out wanted from unwanted information for more precise applications... ensuring that the circuits can robustly be used for applications such as pattern recognition"