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利用几何光学理论分析了波导与探测器吸收层之间的光学传播情况，以硅基波导与ＧｅＳｉ／Ｓｉ多量子阱ＰＩＮ探测器吸收层为分析对象，说明光学耦合效率与两层介质的折射率分布及吸收层长度的关系。
Based on the theory of geometrical optics, the optical propagation between the waveguide and the absorber is analyzed. Taking the silicon-based waveguide and the GeSi / Si MQW detector as the analytic object, the optical coupling efficiency and the refractive index Distribution and absorption layer length relationship.