Centre National De La Recherche Scientifique

Université Grenoble Alpes

Guillaume Bourdarot

Hugues Guillet De Chatellus

Jean-Philippe Berger

A wideband device for measuring the cross-correlation of a first signal and a second signal, includes a first frequency-shifting optical cavity comprising a first frequency shifter designed to shift the optical frequency of the first signal by a first frequency fper round trip in the first cavity, the first cavity having a first trip time τ; a second frequency-shifting optical cavity comprising a second frequency shifter designed to shift the optical frequency of the second signal by a second frequency fper round trip in the second cavity, the second cavity having a second trip time τ; the first and the second optical cavity being designed such that a maximum number of round trips of the first and the second signal in the first and the second cavity is equal to predetermined N, a detector designed to coherently detect the first signal transmitted by the first cavity and the second signal transmitted by the second cavity and generate a photocurrent (Tr) proportional to a luminous intensity detected by the detector, a low-pass filter designed to filter frequencies of the photocurrent that are lower than min (I), a processor configured to compute a Fourier transform of the photocurrent, so as to generate an output signal that is representative (II).

Growing community of inventors

SAINT MARTIN D'HERES, France

Guillaume Bourdarot