We propose and analyze a novel compact modulator on a silicon-on-insulator (SOI) waveguide with the modulation mechanisms of free-carrier plasma dispersion effect. The free carriers are produced by two-photon absorption (TPA) effect, and to understand the change process of free carriers in the silicon, we carried out theoretical simulation and calculation on it, which based on the coupling wave propagation equation and boundary conditions. Free carriers density of 2.5×1017/cm3 could be obtained under pump power of 50 mW and the refractive index change Δn of 9.24×10-4 are achieved. The result indicates that TPA-induced free carriers could be effectively change the effective refractive index of the silicon and further realize the modulation application in silicon modulators.
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