Design and Simulation of Electro-optic Modulator Associate with Directional Coupler for optical communication system

Abstract

The Electro-optic Modulator Associate with Directional Coupler is important in optical communication systems because of its simplicity, linearity, extensive material availability, and small size. Its rapid response time, less than a few picoseconds, and broad wavelength bandwidth of several hundred nanometers add to its desirability. In our study, we designed and tested an optical delay generator using materials such as lithium niobate, DR1-doped SU-8 polymer, and doped polysilicon. Under a 100 V applied voltage, these materials show a refractive index shift of 0.01 to 0.02, which is sufficient to vary the optical path length. A 0.05 refractive index shift causes a 2.5 mm path length variation for a 50 mm length, indicating a promising future for optical communication applications.