Design optimization of polymer electro-optic Modulators using inverted-rib optical waveguide

摘要

Polymer electro-optic modulators are essential elemental components for opto-sensors and optical fiber communication system [1, 2, 3]. In this paper, we designed a low-loss polymer electro-optic modulator with an inverted-rib waveguide structure based on new fluorinated polyimides electro-optic materials, which has more advantages in the preparation and device performance parameters. Also we calculated the key modulator parameters, such as half wave voltage (V_π), characteristic impedance (Z_m), microwave equivalent refractive index (N_m), bandwidth (B_w), loss coefficient (α_o) in detail, according to different width, thickness and gap of electrode, then an optimized polymer electro-optic modulator structure with CPW electrode system was reported in theory. Finally, the simulation results show that the designed EOM has a low loss coefficient (α_0) of about 0.08 dB/cm/GHz~(0.5) with a high frequency of 10 GHz at 1.55 μm.