Electro-refractive optical modulator is an optical device using the refraction principle of the light, which is related directly to the refractive index of a material, to modulate an optical signal via an applied external electric field. For multiple quantum well (MQW) materials, taking the advantage of the quantum-confined Stark effect (QSQE) to investigate the change in the absorption coefficients and refractive index, we calculated the refractive index for Ge/SiGe MQW and investigated optical characteristics of the electro-refractive modulation using Ge/SiGe MQW by FDTD and MODE Ansys lumerical simulation. We have found that the use of MQW materials might potentially contribute to an efficient electro-refractive modulation.
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