Apparatus and method for detecting polarization

Details Apparatus and method for detecting polarization Apparatus and method for detecting polarization

G - Physics

01

J

G01J 4/00 (2006.01) G01J 4/04 (2006.01) G01N 21/21 (2006.01)

Patent

CA 2362666

An apparatus and method for detecting the state of polarization (SOP). The apparatus of the present invention includes a phase retarder and a polarizer which rotate with different speeds. In the method of the present invention, optical signals passed through the rotating phase retarder and the rotating polarizer are detected and their harmonic components related to rotating frequencies of phase retarder and polarizer are analyzed, which gives the Stokes parameters representing the state of polarization. According to the present invention, the amount of phase retardation at the phase retarder can be obtained together with the state of polarization using frequency component analysis, reducing measurement errors. The present invention has advantages in SOP measurement of wide wavelength range, increasing the measurement accuracy.

L'invention concerne un appareil et un procédé de détection de l'état de polarisation. L'appareil selon la présente invention comprend un retardateur de phase et un polariseur tournant à des vitesses différentes. Selon le procédé de la présente invention, on détecte les signaux optiques passant par le retardateur de phase et le polariseur rotatifs et on analyse leurs composantes harmoniques relatives à la fréquence de rotation du retardateur de phase et du polariseur, ce qui permet d'obtenir des paramètres de Stockes représentant l'état de polarisation. Selon la présente invention, l'analyse des composantes fréquences permet d'obtenir le degré du retard de phase au niveau du retardateur de phase, ainsi que l'état de polarisation, ce qui réduit les erreurs de mesure. La présente invention présente l'avantage de permettre la mesure de l'état de polarisation sur une large plage de longueurs d'onde, et d'améliorer la précision desdites mesures.

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