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Accueil > Équipes > OPTique et IMAgerie > Photonique micro-ondes et auto-imagerie

Arbitrary waveform generation in frequency shifting loops

publié le , mis à jour le

Côme Schnébelin, Hugues Guillet de Chatellus
Collaboration : Luis Romero Cortés, MAurizio Burla, José Azaña (INRS Montréal)

PNG
We have demonstrated another promising application of FSF lasers to microwave photonics. An injected FSF loop makes it possible to generate a frequency comb whose spectral phase is quadratic and adjustable. The output field of this laser is therefore equivalent to that of a locked mode laser, after propagation in a dispersive line inducing group velocity dispersion, that is to say a pulse exhibiting frequency drift. (or "chirp"). In the case of the FSF laser, the rate of "chirp" as its sign are very easily adjustable by slightly changing the parameters of the FSF cavity.

By recombining the "chirped" optical pulse with the injection laser (heterodyning), the optical frequencies are brought back to the RF domain to produce "chirped" RF signals. The great simplicity of the device and the remarkable properties of the technique (repeatability, consistency of chirp chirp, flexibility, etc ...) led us to file a patent, currently being extended. This work could have applications in radar (FMCW, pulse compression), in RF spectroscopy, or in characterization of RF components.

References :

  • H. Guillet de Chatellus, L. Romero Cortés, C. Schnébelin, M. Burla, and J. Azaña, Reconfigurable photonic generation of broadband chirped waveforms using a single CW laser and low-frequency electronics, Nature Commun., accepted (2018).
  • Dispositif de génération photonique de signaux micro-ondes à modulation linéaire de fréquence arbitraires, Brevet Université Grenoble Alpes/CNRS/INRS, N° national : 1560294 (2015)
  • H. Guillet de Chatellus, L. Romero Cortés, M. Burla, C. Schnébelin, J. Azaña, Agile photonic generation of arbitrary RF chirped waveforms based on a single CW laser, MWP 2017, Beijing (2017).
  • H. Guillet de Chatellus, C. Schnébelin, L. Romero Cortés, M. Burla, J. Azaña, Agile photonic generation of arbitrary RF chirped waveforms based on a single CW laser, CLEO Europe Munich (2017).
  • H. Guillet de Chatellus, L. Romero Cortés, M. Burla, C. Schnébelin, J. Azaña, Agile photonic generation of arbitrary RF chirped waveforms, CLEO US, San José (2017).