Photonic synthesis of radio frequency waveforms revived the quest for unrivalled microwave purity by its seducing ability to convey the benefits of the optics to the microwave world. In this contribution, we will present a high-fidelity transfer of frequency stability between an optical reference and a microwave signal via a low-noise fiber-based frequency comb and cutting-edge photo-detection techniques. We will show the generation of the purest microwave signal with a fractional frequency stability below 6.5×10-16 at 1 s and a timing noise floor below 41 zs Hz-1/2 (phase noise below -173 dBc Hz-1 for a 12 GHz carrier). This outclasses existing sources and promises a new era for state-of-the-art microwave generation. The characterization is achieved through a heterodyne cross-correlation scheme with lowermost detection noise. This unprecedented level of purity can impact domains such as radar systems, telecommunications and time-frequency metrology. The measurements methods developed here can benefit the characterization of a broad range of signals.
Xiaopeng Xie, Romain Bouchand, Daniele Nicolodi, Michele Giunta, Wolfgang Hänsel, Matthias Lezius, Abhay Joshi, Shubhashish Datta, Christophe Alexandre, Michel Lours, Pierre-Alain Tremblin, Giorgio Santarelli, Ronald Holzwarth, and Yann Le Coq, "Ultra-low noise microwave signal generation with an optical frequency comb," Proc. SPIE 10518, Laser Resonators, Microresonators, and Beam Control XX, 105180N (Presented at SPIE LASE: January 30, 2018; Published: 16 February 2018); https://doi.org/10.1117/12.2286316.
Conference Presentations are recordings of oral presentations given at SPIE conferences and published as part of the conference proceedings. They include the speaker's narration along with a video recording of the presentation slides and animations. Many conference presentations also include full-text papers. Search and browse our growing collection of more than 12,000 conference presentations, including many plenary and keynote presentations.