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In order to obtain large broadband, a novel travelling-wave modulator with nonperiodic domain inversions and ridge structure is proposed. The composite structure is designed to achieve velocity matching between the optical wave and the microwave, to get a 50Ωcharacteristic impedance and to reduce the loss of the microwave electrodes with finite element method (FEM). The calculation results show that the frequency response of the new device is flat up to 350 GHz with interaction length of 1 cm, characteristic impedance of 49Ω, and microwave refractive index of 2.5.
In order to obtain large broadband, a novel traveling-wave modulator with nonperiodic domain inversions and ridge structures is proposed. The composite structure is designed to achieve velocity matching between the optical wave and the microwave, to get a 50Ωcharacteristic impedance and to reduce the loss of the microwave electrodes with finite element method (FEM). The calculation results show that the frequency response of the new device is flat up to 350 GHz with interaction length of 1 cm, characteristic impedance of 49Ω, and microwave refractive index of 2.5.