This research field is located between microwaves and optics. The investigations are thus performed in relation with the “photonic group” of LAAS. The goal is to take benefit of the special properties of some optical devices, such as very high Q resonators or optical fiber delay lines, which may be used for filtering applications or oscillator stabilization at microwave frequencies.
Whispering gallery mode optical resonator for microwave filtering
To this purpose, the microwave signal is converted to optics using an optical carrier, and then converted again to microwaves using a fast photodiode. The goal is to realize microwave sources with ultimate phase noise performance in a small volume, and also to be able to distribute these signals in a system using optical fibers. This includes investigations on integration, modelling and characterization of these systems. The modelling approach is based on the implementation of equivalent models of the optical devices in electronic CAD tools. The characterization approach includes the measurement of all the noise sources in the system : optical and electrical.
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