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Simple-Design Low-Noise NLTL-Based Frequency Synthesizers for a CPT Cs Clock

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3 Author(s)
Boudot, R. ; Lab. Nat. de Metrol. et d''Essais, Obs. de Paris, Paris, France ; Guerandel, S. ; de Clercq, E.

This paper presents simple-architecture low-noise frequency synthesis chains generating a 9-GHz signal. These devices are based on the use of a nonlinear transmission line (NLTL) used as a comb generator. The residual phase noise spectra of the key components are reported. The residual phase noise performance of the chains at 9 GHz is measured to be less than -80 dBrad2/Hz at 1-Hz offset frequency. The measured fractional frequency stability of the chains is 1 times 10-14 at 1 s and better than 4 times 10-17 at one day. The contributions of these chains to phase lock two extended cavity diode lasers (ECDLs) involved in a coherent-population-trapping (CPT) Cs clock experiment are evaluated and measured.

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Instrumentation and Measurement, IEEE Transactions on  (Volume:58 ,  Issue: 10 )