Fourier Modeling and Numerical Characterization on a High-Linear Bias-Free Polymer Push-Pull Poled Y-Fed Coupler Electro-Optic Modulator

A high-linear bias-free polymer Y-fed coupler electro-optic (EO) modulator with push-pull poled two section waveguides is proposed. Using Fourier transformation, a novel formulation technique is presented to numerically model and characterize the device performances. As an EO modulator, the half-wave voltage is 2.6852 V, and the 3-dB modulation bandwidth is ~ 143 GHz. As an EO switch, the insertion loss and crosstalk are <; 3.548 and <; -30 dB, respectively, and the 10%-90% rise time and fall time are both ~ 3.90 ps, indicating a cutoff switching frequency up to 128.2 GHz. As the modulation coefficient is within the range of 1%-10%, the distortion suppression on the third-order intermodulation distortion signals is as high as 60-90 dB, suggesting favorable linearity. This analytical technique is also efficient to theoretically predict the performances of a device with Y-fed coupler structure.