Integrated optic modulator with smooth electro-optic...

G - Physics – 02 – F

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G02F 1/225 (2006.01) G02F 1/035 (2006.01)

Patent

CA 2125963

An optic intensity modulator includes a substrate (10) of an optic material that is conductive to light and acoustic waves and has both the electro-optic and piezoelectric properties. The optical modulator generally consists of a Mach-Zender interferometer comprising a pair of associated elongated light waveguides (11, 12) formed in the substrate, with the waveguides extending substantially coextensively with one another, and being separated from one another by a transverse distance that gradually varies along the courses of the waveguides. Different phase shifts are induced by imposing variable electric fields onto each of the waveguides by means of electrodes (21, 22, 23). Because of the varying spacing between the waveguides along their courses, the tendency of the acoustic waves that are generated during the operation of the modulator due to the piezoelectric effect to resonate between the waveguides at certain frequencies, is eliminated thus reducing the corresponding noise distortion.

Un modulateur d'intensité optique comprend un substrat (10) d'un matériau optique conducteur de la lumière et des ondes acoustiques, et possède à la fois des propriétés électro-optiques et piézoélectriques. Le modulateur optique se compose généralement d'un interféromètre Mach-Zender comprenant une paire de guides d'ondes lumineux, allongés, combinés (11, 12) formés dans le substrat, ces guides d'ondes s'étendant pratiquement sur une même étendue les uns par rapport aux autres, et se trouvant séparés les uns des autres d'une distance transversale qui varie graduellement le long de leurs déplacements. Des décalages de phase différents sont induits en imposant des champs électriques variables sur chacun des guides d'ondes au moyen d'électrodes (21, 22, 23). Du fait de l'écartement variable des guides d'ondes le long de leurs déplacements, la tendance des ondes acoustiques, générées lors du fonctionnement du modulateur par l'effet piézoélectrique, à résonner entre les guides d'ondes à certaines fréquences, est éliminée, réduisaant ainsi la distorsion de bruit correspondante.

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