Frequency Stable Microwave Sapphire Oscillators

Abstract

We show that state-of-the-art phase noise and high frequency stability could be simultaneously achieved in a microwave oscillator based on the sapphire-loaded cavity resonator. The 9 GHz sapphire oscillator was constructed with the SSB phase noise close to -170 dBc/Hz at an offset frequency of 10 kHz and fractional frequency instability less than 2 10${}^{-13}$ for integration times from 5 to 50 s. In this work, we focus on the technique for phase-referencing the microwave sapphire oscillator to a stable radio-frequency source. We also discuss the suppression of the fast phase fluctuations of the microwave signal due to its transmission through the high-Q resonator.

arXiv comment4 pages, 9 figures

References in corpus (5)

• Photonic microwave signals with zeptosecond level absolute timing noise
• 8E-17 fractional laser frequency instability with a long room-temperature cavity
• Coherent Optical Clock Down-Conversion for Microwave Frequencies with 10-18 Instability
• Optimizing the linearity in high-speed photodiodes
• Noise Suppression with Cryogenic Resonators

Cited by in corpus (3)

• Microwave Cavity Mode Optimisation by Background Anti-Resonance Tuning
• Ultralow noise microwaves with free-running frequency combs and electrical feedforward
• Sharp electromagnetically induced absorption via balanced interferometric excitation in a microwave resonator