Device for optical spectra analysis by means of brillouin...

G - Physics – 01 – J

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G01J 3/44 (2006.01)

Patent

CA 2505044

The invention relates to a device which is used for the spectral analysis of optical signals and which is based on the stimulated Brillouin scattering effect. The invention also relates to the associated measurement method which makes use of the optical signal amplification caused by the Brillouin scattering effect. The Brillouin scattering effect enables the selective optical amplification of a determined component of the optical spectrum of the signal to be analysed, known as the problem signal, for the measurement thereof with a determined dynamic range, sensitivity and resolution. According to the invention, the problem signal is introduced into an optical fibre together with a narrowband optical signal, known as the probe signal, within a determined wavelength. Said probe signal propagates in the opposite direction to that of the problem signal, such that both signals interact inside the fibre owing to the Brillouin effect.

L'invention concerne un dispositif conçu pour l'analyse spectrale de signaux optiques, basé sur l'effet de diffusion Brillouin stimulée, ainsi qu'un procédé de mesure associé qui fait appel à l'amplification optique des signaux sous l'effet de la diffusion Brillouin. L'effet de diffusion Brillouin permet de procéder à l'amplification optique sélective d'une composante déterminée du spectre optique du signal à analyser, que nous appellerons signal problème, afin de le mesurer avec une résolution, une sensibilité et une latitude de mesure déterminées. Le signal problème est introduit dans une fibre optique conjointement avec un signal optique de bande étroite, que nous appellerons signal sonde, centré dans une longueur déterminée d'onde, qui se propage dans le sens contraire à celui du signal problème, ce qui entraîne une interaction des deux signaux à l'intérieur de la fibre, sous l'effet Brillouin.

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