Abstract
A second-order accurate finite-difference time-domain (FDTD) model is, for the first time, proposed for efficient and reliable modeling of depletion-mode traveling-wave silicon photonics (SiP) modulators. After reviewing small signal and first-order large signal models for SiP modulators, we derive the second-order FDTD large-signal model for the staggered voltage and current fields in the p-n (PN) loaded transmission line with a series push-pull (SPP) circuit configuration. By modeling the non-even splitting distributive RF voltages on the two PNs, accurate propagation parameters of the two arms of a Mach-Zehnder interferometer (MZI) can be obtained to simulate modulated optical signals. The large signal simulations of 16-QAM SiP modulator at 64 Gbaud are used to demonstrate the application of the developed FDTD model.
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