首次对Ｇｅ０．６Ｓｉ０．４／Ｓｉ应变超晶格光探测器中的光场分布进行了分析和研究，发现这种应变超晶格在总厚度Ｌ＝３４０ｎｍ的情况下，周期数Ｍ≥１５．５才能传输单模光波．另外，还计算了Ｇｅ０．６Ｓｉ０．４／Ｓｉ应变超晶格表面及传播一定距离后的光场分布，发现光在其中传播５００μｍ后已衰减到很小．这些结果对器件的设计具有重要的意义 For the first time, the light field distribution in the Ge0.6Si0.4 / Si strained superlattice photodetector has been analyzed and studied. It is found that the number of cycles M≥15 in the case of L = 340nm total thickness. 5 can transmit single-mode light wave. In addition, the distribution of the light field of the Ge0.6Si0.4 / Si strained superlattice surface and the propagation of a certain distance was also calculated. It was found that the light had attenuated to a very small extent after propagating 500μm. These results are of great importance to the design of the device