Importance

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Abstract

An electrooptic modulator includes structure defining a single crystal substrate upon which are positioned, in succession, an inside reflector formed by a set of epitaxial single crystal layers, a resonator layer and an outside reflector formed by another set of epitaxial single crystal layers. A first part of the structure, including one or more of the inside reflector, substrate and resonator layer, is electrically conductive (either p-type or n-type conduction) and a second part, including the outside reflector and/or the resonator layer, is electrically conductive (either n-type or p-type conduction, but a different to the first part). The structure further includes first and second electrical conductors in ohmic contact respectively with the first and second part of the structure thereby to enable, by application of electrical potential to the electrical conductors, a reverse bias to be applied to the structure to cause an electric field to be applied across the resonator layer whereby the refractive index of the resonator layer is varied by varying the electric field pursuant to variation of the bias, to correspondingly modulate light in use passing through the modulator.

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First Claim