Device for controlling an optical signal modulation...

G - Physics – 02 – F

Patent

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G02F 1/39 (2006.01) G02F 1/03 (2006.01) G02F 1/35 (2006.01)

Patent

CA 2387849

The invention concerns a device for controlling an optical signal modulation frequency, in particular a device for controlling the modulation frequency of an optical signal modulated at a microwave or millimetric frequency. The invention is characterised in that it comprises a photorefractive crystal (7), a photodetector (6), means (8a, 8b, 8c, 9a, 9b, 9c) for sending on said crystal (7) at least part of the modulated optical signal and part of a write optical signal for photo-inscription of a Bragg grating on said crystal (7), the orientations of the modulated optical signal and of the write optical signal relative to said crystal (7) being such that, for a given optical signal wavelength, the photodetector (6) detects an intensity of signal reflected by the crystal (7) which reaches a maximum when the optical signal is modulated at the frequency modulation to be detected.

Dispositif pour le contrôle d'une fréquence de modulation d'un signal optique - notamment dispositif pour le contrôle de la fréquence de modulation d'un signal optique modulé à une fréquence micro-ondes ou millimétrique -, caractérisé en ce qu'il comporte un cristal (7) photoréfractif, un photodétecteur (6), des moyens (8a, 8b, 8c; 9a, 9b, 9c) pour envoyer sur ledit cristal (7) d'une part au moins une partie du signal optique modulé et d'autre part un signal optique d'écriture pour la photoinscription d'un réseau de Bragg sur ledit cristal (7), les orientations du signal optique modulé et du signal optique d'écriture par rapport audit cristal (7) étant telles que, pour une longueur d'onde de signal optique donnée, le photodétecteur (6) détecte une intensité de signal réfléchi par le cristal (7) qui atteint un maximum lorsque le signal optique est modulé à la fréquence de modulation à détecter.

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