G - Physics – 01 – J
Patent
G - Physics
01
J
G01J 9/00 (2006.01)
Patent
CA 2533677
This invention relates to a method and apparatus for measuring the phase change of an output optical signal from a device. In one embodiment an input optical signal is split into first and second optical signals, and the first optical signal is passed through the device while applying an external stimulus to the device, to produce an output optical signal having a phase shift. The carrier frequency of the second optical signal is changed, and the output optical signal and the changed second optical signal are then combined. The combined signal is detected in accordance with the external stimulus applied to the device, and the phase change of the output signal of the device is measured as a function of the external stimulus applied to the device.
L'invention concerne un procédé et un dispositif destinés à mesurer le changement de phase d'un signal optique de sortie en provenance d'un dispositif. Dans un mode de réalisation, un signal optique d'entrée est divisé en un premier et un second signal optique, le premier signal optique traversant le dispositif lors de l'application d'un stimulus externe sur le dispositif en vue de la production d'un signal optique de sortie présentant un déphasage. La fréquence porteuse du second signal optique est modifiée et le signal optique de sortie et le second signal optique modifié sont ensuite combinés. Le signal combiné est détecté selon le stimulus externe appliqué sur le dispositif et le changement de phase du signal de sortie du dispositif est mesuré en fonction du stimulus externe appliqué sur le dispositif.
Cartledge John C.
Krause David J.
Queen's University At Kingston
Scribner Stephen J.
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