Equivalent circuit model of the carrier-depletion-based push-pull silicon optical modulators with T-rail slow wave electrodes

The T-rail electrode has emerged as an effective solution to improve the bandwidth of the silicon optoelectronic modulator. T-rail electrodes have shown to be a successful method of increasing the silicon optoelectronic modulator's bandwidth. Engineers frequently use finite-element numerical simulations, which necessitate intricate device modeling and massive computational resources, to design and optimize T-rail electrodes. To design and optimize T-rail electrodes, engineers often rely on finite-element numerical simulations that require complex device modeling and enormous computing resources. In this paper, we present an equivalent circuit model for carrier-depletion-based push-pull silicon modulators with T-rail electrodes. The analytical solution for the bandwidth of the modulator can be derived from the equivalent circuit. The utilization of the analytical solution offers advantages in terms of memory conservation and flexibility. The values calculated by the equivalent circuit model are in excellent agreement with the numerical full-wave HFSS simulations. Hence, the proposed model can accurately and efficiently develop silicon optical modulators.