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Updated: Jun 19, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
Radio-frequency clock delivery via free-space frequency comb transmission
Ayshah Alatawi1, Ravi P Gollapalli, Lingze Duan
1Department of Physics, University of Alabama in Huntsville, Huntsville, Alabama 35899, USA.
Abstract:
We characterize the instability of an rf clock signal caused by free-space transmission of a frequency comb (FC) under typical laboratory conditions. The phase-noise spectra show the involvement of multiple random processes. For a 10 m transmission, the rms timing jitter integrated over 1-10(5) Hz is 95 fs, and the root Allan variance over 1 s is 4x10(-13). The measured Allan variance has a tau(-1) behavior and an excellent agreement with the phase noise measurement. These results indicate the feasibility of FC-based free-space rf clock distribution over short distances.
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