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随着光纤通信技术的发展,高量子效率、高速响应光电探测器在长距离高速光纤通信系统中的作用尤显突出。利用传输矩阵法(TMM)对新型双吸收层光电探测器(RCE-PINIP)的量子效率进行了理论计算,然后对其进行了相应的理论仿真。结果显示,在50～800nm厚度范围内,随着双吸收层厚度逐渐变大,RCE-PINIP模型的量子效率会出现多个峰值,量子效率的峰值先增大到最大值,在两个单吸收层厚度同为325nm时,量子效率达到98.6%,然后峰值逐渐递减。在两个单吸收层厚度分别固定为325nm时,量子效率随另一个单吸收层厚度的变化关系几乎相同。针对这个RCE-PINIP模型结构,通过对两个单吸收层厚度分别进行优化,得到了一个能实现高量子效率的优化结构模型。
With the development of optical fiber communication technology, the role of high quantum efficiency and high-speed photodetector in the long-distance and high-speed optical fiber communication system is especially prominent. The quantum efficiency of the new dual-absorption-layer photodetector (RCE-PINIP) is theoretically calculated by the transfer matrix method (TMM), and then the corresponding theoretical simulation is carried out. The results show that the quantum efficiency of the RCE-PINIP model will have multiple peaks and the peak of quantum efficiency will first increase to the maximum value as the thickness of double absorption layer becomes larger in the range of 50-800 nm. The same layer thickness of 325nm, the quantum efficiency of 98.6%, and then the peak gradually decreased. When the thickness of the two single absorption layers is respectively fixed at 325 nm, the quantum efficiency changes almost in the same way as the thickness of the other single absorption layer. According to the RCE-PINIP model structure, an optimized structure model with high quantum efficiency is obtained by optimizing the thickness of two single absorption layers respectively.