振动 resilient 超稳定微波信号的魔法抵消点
Magic Cancellation Point for Vibration Resilient Ultrastable Microwave Signal
AI总结：
针对光子合成微波信号在非实验室环境下振动敏感的问题，提出利用“魔法抵消点”技术抵消振动诱导噪声，保留相位噪声优势，实现10GHz信号的低相位噪声与高振动抗性，适用于任意光载波。
摘要：
光子合成微波信号已证明能超越传统射频信号生成手段可实现的相位噪声性能。然而，要让微波光子振荡器真正取代射频振荡器，这种相位噪声优势在实验室外也需可实现。振荡器普遍振动敏感，传统射频与光学振荡器在非极端稳定环境下相位噪声会急剧劣化。本文展示一种利用两光信号间精确频率差（“魔法抵消点”）的技术，可在光分频至射频时抵消振动诱导噪声，且保留分频过程的优异相位噪声。10GHz中心频率下，分频振荡器在1Hz、10Hz、100Hz、10kHz偏移频率处相位噪声分别为-42、-72、-102、-139dBc/Hz；光到射频的振动诱导相位噪声抵消22.6dB，加速度灵敏度达1.5×10⁻¹⁰g⁻¹，该技术适用于任意中心波长和谐振腔几何结构的光载波。
英文摘要：
Photonically-synthesized microwave signals have demonstrated the ability to surpass the phase-noise performance achievable by traditional means of RF signal generation. However, in order 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 in general are known to be notoriously vibration sensitive, with both traditional RF and optical oscillators degrading sharply in phase noise 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 enable the cancellation of vibration-induced noise upon optical frequency division to the RF. Beyond simply mitigating the effects of vibration, this technique also preserves the excellent phase noise that would ordinarily be characteristic of signals obtained from a frequency division process. At a center frequency of 10 GHz, our divided down oscillator achieves -42 dBc/Hz, -72 dBc/Hz, -102 dBc/Hz, and -139 dBc/Hz at 1 Hz, 10 Hz, 100 Hz, and 10 kHz offset frequencies, respectively. In addition, from optical to RF, we showcase the cancellation of vibration-induced phase noise by 22.6 dB, reaching an acceleration sensitivity of $1.5 \times 10^{-10}$ g$^{-1}$. This technique applies widely to optical carriers of any center wavelength and derived from an arbitrary resonator geometry.
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