An integrated-optic device using electrooptic polymer waveguide on Si substrate for modulating focus spot intensity distribution

A device integrating a focusing grating coupler (FGC) and a modulator in an electrooptic polymer slab waveguide on a Si substrate is proposed and demonstrated. The modulator consists of two-finger upper electrodes and a lower electrode sandwiching the slab waveguide. The electrodes are used for both the poling process and modulating the phase of the guided wave. The intensity distribution on the focal plane of the FGC is modulated from one spot to two spots, of which peak intensity is half that of the one-spot state when the applied voltage varies from zero to the halfwave voltage.>