Magic cancellation point for vibration resilient ultrastable microwave signal synthesis

William Loh (), Dodd Gray, Ryan Maxson, Dave Kharas, Jason Plant, Paul W. Juodawlkis, Cheryl Sorace-Agaskar and Siva Yegnanarayanan
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William Loh: MIT Lincoln Laboratory
Dodd Gray: MIT Lincoln Laboratory
Ryan Maxson: MIT Lincoln Laboratory
Dave Kharas: MIT Lincoln Laboratory
Jason Plant: MIT Lincoln Laboratory
Paul W. Juodawlkis: MIT Lincoln Laboratory
Cheryl Sorace-Agaskar: MIT Lincoln Laboratory
Siva Yegnanarayanan: MIT Lincoln Laboratory

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: Abstract Photonically-synthesized microwave signals have surpassed the phase-noise performance achievable by traditional means of RF signal generation. However, for microwave-photonic oscillators to truly replace their RF counterparts, this phase-noise advantage must also be realizable when operating outside of a laboratory. Oscillators are known to be notoriously vibration sensitive, with both traditional RF and optical oscillators degrading sharply in all but the most stationary of environments. We demonstrate here a powerful technique that makes use of a precise frequency difference between two optical signals, termed the magic cancellation point, to suppress the vibration-induced noise upon optical frequency division to the RF. We showcase the cancellation of vibration noise by 22.6 dB, achieving an acceleration sensitivity of 1.5 × 10−10 g−1. Beyond mitigating the effects of vibration, this technique also preserves the excellent phase noise obtained by optical frequency division and reaches −72 dBc/Hz and −139 dBc/Hz at 10 Hz and 10 kHz offset frequencies on a 10 GHz carrier. This technique applies widely to optical carriers of any center wavelength and derived from an arbitrary resonator geometry.

Date: 2025
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DOI: 10.1038/s41467-025-63369-3

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