Integrated electrooptical modulating circuit

The invention discloses an integrated electro-optic (EO) modulator, which is object to reduce the power consumption of the electro-optic modulator based on free-carrier dispersion effect and raise the operation speed of the electro-optic modulator. New circuit architecture for electro-optic modulator based on free-carrier dispersion effect is invented, in which the waveguide capacitor of the modulator is embed in the circuits and physically layout together with transistors, the switching of the modulator occurs in transistors, and as the result, the electro-optical modulation occurs in the waveguide capacitor. The invented modulator is not one physical device, it is actually a circuit. The EO modulators invented in this invention are actually circuits: the electrical-optical interaction occurs in the waveguide-capacitor, which is seamlessly, in one body or distributive manner, part of a modulator-circuit. This new design approach and the modulator circuits can improve the performance of the modulator to its physical limit, in both modulation rate and power consumption, thereby effectively decreasing the dimension of modulator and improving the operation speed of the circuit.