Velocity-matched, traveling-wave electro-optical devices...

G - Physics – 02 – F

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G02F 1/035 (2006.01)

Patent

CA 2368726

An electro-optic device such as a Mach-Zehnder interferometer that includes a lithium niobate substrate having an optical waveguide that is formed in an upper surface of the substrate is described. The device includes a polymer buffer layer formed on the upper surface of the substrate. The polymer may be non-conductive or conductive. An electrode is formed on an upper surface of the buffer layer and is positioned to receive an RF signal that induces an electrical field in the optical waveguide. A conductive charge bleed-off layer may be formed between the buffer layer and the electrode in order to bleed-off pyroelectric charge. A semiconductor charge bleed-off layer may be formed between the substrate and the buffer layer.

L'invention concerne un dispositif électro-optique, par exemple un interféromètre Mach-Zehnder, comprenant un substrat de niobate de lithium possédant une guide d'ondes optique formée dans la surface supérieure du substrat. Le dispositif comprend une couche intermédiaire polymère formée sur la surface supérieure du substrat. Le polymère peut être non conducteur ou conducteur. Une électrode est formée sur la surface supérieure de la couche intermédiaire et est positionnée de manière à recevoir un signal RF induisant un champ électrique dans la guide d'ondes optiques. Une couche conductrice de décharge peut être formée entre la couche intermédiaire et l'électrode afin de décharger la charge pyroélectrique. Une couche semi-conductrice de décharge peut être formée entre le substrat et la couche intermédiaire.

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