Investigation of a dielectric waveguide with a variable refractive-index discontinuity at the boundary

A description is given of a light modulator in which radiation travels along a waveguide and is modulated by variation of the refractive-index discontinuity at the boundary between the waveguide and an electrooptic material. A derivation is given of the dependence of the depth of modulation of the radiation on the change in the refractive index and the number of reflections at the waveguide boundary. It is shown that this method makes it possible to increase significantly the modulation frequency.