Ultra-Stable Microwave Signal Generation with Er: Fiber-Based Optical Frequency Comb

Abstract

We demonstrate 9.192 GHz microwave signals from photonic microwave generation based on Er:fiber-based optical frequency combs and 1.55 μm ultra-stable lasers, which used for local oscillators of cesium fountain clock. The frequency instability of the 9.63 GHz/9.54 GHz microwave signals is 3×10 ^-15 @ 1s, with phase noise is of -94 dB rad ² /Hz @ 1 Hz, and the synthesized tunable 9.192 GHz signal exhibits an instability of 6.7×10 ^-15 @1s. Further improvement of the photonic oscillators is undergoing.