Electrostrictive fiber modulators

G - Physics – 02 – F

Patent

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Details

G02F 1/01 (2006.01) G02F 1/03 (2006.01) G02F 1/035 (2006.01) G02F 1/313 (2006.01)

Patent

CA 2349550

An apparatus modulates the phase of an optical signal. The apparatus includes an optical medium (110) for propagating the optical signal. At least one electrode (130, 132) is positioned in proximity with the medium (110). The electrode induces an electric field within the medium in re-sponse to an AC voltage to produce varia-tions in the index of refraction of the optical medium (110) through the electrostrictive effect. Preferably, the phase of the optical signal is modulated such that polarization components of the optical signal parallel to and orthogonal to the electric field experience an equal phase shift. In certain embodiments, a DC voltage is supplied to the optical medium. Alternatively, the DC voltage within the optical medium may arise from poling the optical medium. Certain embodiments of the present invention include two electrodes positioned on opposite sides of the optical medium. The apparatus is used in an interferometer to form modulation device or switching device.

L'invention concerne un appareil qui module la phase d'un signal optique. Ledit appareil comporte un milieu optique (110) pour la propagation du signal optique. Une électrode (130, 132), au moins, se trouve à proximité du milieu (110). Suite à l'application d'un courant alternatif, ladite électrode induit un champ électrique au sein du milieu et, par l'effet électrostrictif, l'indice de réfraction du milieu (110) varie. Il est préférable de moduler la phase du signal optique de sorte que les composantes de polarisation du signal optique qui sont parallèles ou perpendiculaires au champ électrique subissent le même déphasage. Dans certains modes de réalisation, on applique un courant continu au milieu optique. On peut aussi créer le courant continu au sein du milieu optique en polarisant ce dernier. Certains modes de réalisation de la présente invention font intervenir deux électrodes situées aux côtés opposés du milieu optique. Cet appareil est utilisé dans un interféromètre pour former un dispositif de modulation ou de commutation.

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