Microcomb chips help pave the way for thousand times more accurate GPS systems

https://www.eurekalert.org/news-releases/1074404

"optical atomic clocks increase time. geographic position precision, but are too large/ complex... lasers instead of microwave frequencies to induce oscillations optically.,. enabling more time fractions, for few cm precision... a comb frequencies can be locked to laser frequency locked to atomic clock oscillation, bridging between clock optical signals and radio frequencies counting clock’s oscillations... pairing 2 microcombs  with a small frequency offset enabling more accessible radio frequency... photonic integration"