Method and device for measuring half-wave voltage of...

G - Physics – 01 – M

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G01M 11/00 (2006.01) G02F 1/01 (2006.01) G02F 1/035 (2006.01) G02F 1/225 (2006.01)

Patent

CA 2456914

A method and a device for measuring the half wave voltage of a Mach-Zehnder type optical modulator accurately and without depending on the bias variation of an optical modulator. The method of measuring the half wave voltage of the Mach-Zehnder type optical modulator comprising the steps of applying a high-frequency AC signal 34 and a monitoring low-frequency AC signal 35 in a superimposed manner to a Mach-Zehnder type optical modulator 1, or applying the both respectively to separately constituted electrodes, and observing the low-speed response of an output light from the optical modulator 1, wherein the half-wave voltage at a frequency to be measured of the Mach-Zehnder type optical modulator 1 is measured by using the voltage amplitude of the high-frequency AC signal 34 when the intensity change of an out put light by the monitoring low-frequency AC signal 35 is almost zero with the voltage amplitude of the high-frequency AC signal 34 kept variable.

L'invention concerne un procédé et un dispositif permettant de mesurer de manière précise la tension demi-onde d'un modulateur optique de type Mach-Zehnder, indépendamment de la variation de polarisation du modulateur optique. Ce procédé de mesure de la tension demi-onde dudit modulateur optique de type Mach-Zehnder comprend les étapes consistant à : appliquer un signal alternatif haute-fréquence (34) et un signal alternatif basse fréquence de contrôle (35) de manière superposée sur un modulateur optique de type Mach-Zehnder (1), ou à appliquer ces deux signaux respectivement à deux électrodes indépendantes ; et à observer la réponse lente d'une lumière de sortie provenant du modulateur optique (1). La tension demi-onde du modulateur optique de type Mach-Zehnder (1) présentant une certaine fréquence et devant être mesurée est mesurée au moyen de l'amplitude de tension du signal alternatif haute fréquence (34), lorsque le changement d'intensité d'une lumière de sortie produit par le signal alternatif basse fréquence de contrôle (35) est presque nul alors que l'amplitude de tension du signal alternatif haute fréquence (34) continue à varier.

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