Qian-Qian Luo

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.

Polymeric Multimode Interference Mach–Zehnder Interferometer Electro-Optic Switch Using Embedded Coplanar Waveguide Electrode: Theory, Design, and Analysis

Abstract The self-imaging theory is improved for designing a polymer multimode interference Mach–Zehnder interferometer electro-optic switch. The electro-optic overlap factor is enhanced from 0.6510 to 0.9658 through adopting an embedded coplanar waveguide electrode. Considering the mode dispersion effect, formulations of time-domain response are derived, and switching characteristics are analyzed. The total device length is about 7.175 mm, the switching voltage is 2.622 V, and the switching time is 29.90 ps. The lightwave 3-dB bandwidth is 20 nm, the insertion loss is less than 2.70 dB, and the crosstalk under cross and bar states are less than −55 dB and −45 dB, respectively.