M. Giunta, W. Hänsel, M. Lessing, M. Lezius, M. Fischer, R. Holzwarth, X. Xie, R. Bouchand, D. Nicolodi, Y. Lecoq, P. Tremblin, G. Santarelli, S. Datta, A. Joshi
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We present the progress towards a transportable photonic microwave synthesizer, porting ultra-high optical stability to a 12 GHz signal. The system is composed of two main sub-units: a 194 THz transportable ultra-stable laser with sub-Hz linewidth and an ultra-low noise optical frequency comb used for dividing such optical frequency to the microwave domain. Characterizing the signal by means of a self-made cross-correlator, a phase noise power spectral density of −170 dBc/Hz at 10 kHz Fourier frequency is measured. This result surpasses the performance demonstrated with transportable Cryogenic Sapphire Oscillator.
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