Patent ID: 8244076
Filing Date: 2012-08-14
Classification: G02F

Abstract:
1. A tuneable electro-optic modulator comprising first and second spaced apart output optical waveguides, each output optical waveguide comprising a coupled portion optically coupled to a corresponding coupled portion of the other output optical waveguide, the coupled portions defining a coupling region therebetween; an optical source adapted to symmetrically provide an optical signal to the first and second output optical waveguides; a portion of each of the output optical waveguides having a signal electrode thereon; and a central optical waveguide, at least a portion of which is arranged in the coupling region, the central optical waveguide having a tuning electrode thereon; wherein each output optical waveguide comprises an electro-optic region having a signal electrode thereon and at least one passive region without a signal electrode thereon, the passive region being on the opposite side of the electro-optic region to the optical source, and wherein the coupled portion of each output optical waveguide comprises the electro-optic region and the passive region, the electro-optic region and passive regions of one output optical waveguide being coupled to the corresponding electro-optic and passive regions respectively of the other output optical waveguide.