The invention relates to an electro-optic modulator (10) for modulating optical radiation of a prespecified wavelength, wherein the electro-optic modulator (10) has at least one optical resonator (20), in which for the prespecified wavelength a standing optical wave can form. According to the invention, provision is made for at least two doped semiconductor sections (33, 34) to be arranged in the resonator such that - when viewed in the longitudinal direction of the resonator - they are spaced apart from one another, and for the at least two doped semiconductor sections to be located in each case locally in an intensity minimum of the standing optical wave.