Abstract

We demonstrate an all-fiber-based photonic microwave generation with 10⁻¹⁵ frequency instability. The system consists of an ultra-stable laser by optical fiber delay line, an all-fiber-based “figure-of-nine” optical frequency comb, a high signal-to-noise ratio photonic detection unit, and a microwave frequency synthesizer. The whole optical links are made from optical fiber and optical fiber components, which renders the whole system compactness, reliability, and robustness with respect to environmental influences. Frequency instabilities of 3.5×10⁻¹⁵ at 100 s for 6.834 GHz signal and 4.3×10⁻¹⁵ at 100 s for 9.192 GHz signal were achieved.

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