Revolutionizing sub-THz signal generation by replacing noisy electronic multipliers with optical laser beating.
Multiplying lower-frequency RF clocks up to 140 GHz multiplies phase noise by 20 log(N), severely degrading radar velocity resolution.
Beating two locked optical laser modes on a high-speed photodiode generates clean 140 GHz carriers with phase noise below -110 dBc/Hz at 100 kHz offset.
Photonic radar generation increased target Doppler resolution by a factor of 10, enabling detection of slow-crawling pedestrians situated near fast highway traffic.