Compact asymmetric multimode interference coupler-based Electro-optic switches with Bezier S-bend waveguides

High-speed and energy-efficient electro-optic (EO) switches are crucial for next-generation data communication systems. This paper introduces a novel EO switch with a multimode inference (MMI) coupler-based approach in a Lithium Niobate (LiNbO3) platform, which is developed with Bezier S-bend waveguides to reduce the bending losses, resulting in a substantial bending loss reduction of 0.18 dB. This Bezier-bend EO switch shows an excess loss of 0.33 dB and crosstalk of -20.44 dB for the bar port switching, while cross port switching exhibits an excess loss of 0.64 dB and crosstalk of -13.66 dB. Applying a 3.27 V voltage achieves a balanced splitting ratio of 29:29:29 between the three outputs. The length of this EO switch is 4.09 mm, which needs 4.1V to create a phase shift, showing a voltage efficiency of 1.68 V/cm. This study presents a promising pathway for a novel EO switch design and introduces improved signal management for next-generation high-speed computing systems.