Ultralow-noise microwave/ millimeter-wave signal generation using a stabilized microcomb-based photonic chip

https://www.eurekalert.org/news-releases/1127576

"as frequency increases signals become more unstable/ exhibit phase noise, optical signals more stable but frequencies too high for electronic circuits... overcome: synchronizing chip-scale microcomb to ultra-stable optical reference making signal 100 million times cleaner/ also using Perfect Soliton Crystal state of light keeping timing jitter at record 3 fs... 6G with more data on same spectrum, ultra-fast, low-latency... compact autonomous vehicle radars distinguishing with higher certainty... mobile atomic clocks, sensors"