Accurate modelling and simulation of low loss silicon optical modulators in QPSK

Signal Modulation is a key determinant to the performance of a communication system. In an optical communication network, signal modulation is achieved by an optical modulator. In this work, we study an intrinsic compensated low loss silicon phase shifter arranged around rib waveguide topologies and explore its potential to be applied in quadrature-phase-shift-keying (QPSK) optical modulators. Our method adopted a bottom-up approach to simulate performance of silicon phase shifters. We extended this approach to system level with an implementation of Optical QPSK with device model. Modulated QPSK signal is simulated by calculating the interference between light beams pass through each phase shifter arm. The constellation diagram of modulated QPSK signal is calculated after coherent demodulation.