High-Bandwidth Silicon Strip Waveguide-Based Electro-Optical Modulator in Series Push–Pull Configuration

Silicon modulators operating at high speeds are crucial for contemporary optical communication systems; nevertheless, their performance is limited by the resistance–capacitance (RC) time constant. This research introduces a modulator based on a silicon strip waveguide, also known as a capacitively coupled silicon modulator (CC-Si), arranged in a series push–pull (SPP) configuration, which effectively addresses the constraints imposed by the RC time constant. The modulator demonstrates a consistent electro-optic (EO) response that extends to 68 GHz. Furthermore, it achieves a phase shift of 0.022 radians for a C-band optical wave when exposed to a 15 GHz radio frequency (RF) modulation signal with an amplitude of 2.45 V.