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The formation of non-abrupt interface makes the refractive index profile of an actual SiGe/Si MQW no longer a periodic square wave. A multi-step’index mode is proposed to simulate the actual refractive index profile. Based on this mode, the dispersion equation of the MQW waveguide is obtained by using the transfer matrix method. The effects of index change on the optical field and characteristics of photodetector are evaluated by solving the dispersion equation. It shows that the non-abrupt interface results in decreased effective absorption coefficient and quantum efficiency.
The formation of non-abrupt interface makes the refractive index profile of an actual SiGe / Si MQW no longer a periodic square wave. A multi-step ’index mode is proposed to simulate the actual refractive index profile. Based on this mode, the dispersion equation of the MQW waveguide is obtained by using the transfer matrix method. The effects of index change on the optical field and characteristics of photodetector are evaluated by solving the dispersion equation. It shows that the non-abrupt interface results in decreased effective absorption coefficient and quantum efficiency.