针对ROF(光载无线通信)基站需要高功率大带宽光电探测器的问题, 提出π型光电探测器阵列功率合成电路。通过将探测器嵌入在用电感互连的人工传输线上, 即按照阵列式结构将单个π型光电探测器电路组合起来构成所需电路, 实现功率合成, 从而得到高功率大带宽的信号。电路首尾支路级联两个二极管来降低等效结电容以达到电路的最佳阻抗匹配。仿真结果表明, π型光电探测器阵列能在保持大带宽的同时对各级光电二极管功率进行有效地合成, 相比于同级的行波探测阵列合成效率更高。

The high-power high-bandwidth photodetector is required at the base station in the Radio over Fiber (ROF) system. This paper presents a power combining circuit research on PI type photoelectric detector array. The probe is embedded in an inductor connected with artificial transmission lines. In order to obtain high power and large bandwidth signal, each group of unit structure of PI type circuit of photoelectric detector are connected with inductors based on the structure of array structure together to constitute the required structure. In order to achieve the best match, the first and final stage synthetic circuit branches are cascaded with two photodiode to reduce the equivalent capacity of synthetic circuit. Simulation results show that this arrangement can effectively combine multiple RF photocurrents while keeping the large bandwidth. Comparing with traveling wave detector array at the same level, the combining performance of PI type photoelectric detector array is better.