Digital Implementation of Various Locking Schemes of Ultrastable Photonics Systems

We report on the fully digital implementation of various locking schemes within the frame of microwave photonics systems such as Pound-Drever-Hall (PDH) for ultra-stable lasers based on Fabry-Perot cavities, heterodyne lockin amplifiers for fiber links, laser stabilization of optical clocks. We demonstrate similar performances over their analog counterparts, with a net gain on flexibility and reconfigurability.