新型行波光电探测器阵列的设计与仿真

Design and simulation of novel travelling wave photodetector array

为解决传统行波光电探测器阵列仅能提高输出功率却不能同时提高工作带宽的问题,借鉴椭圆函数低通滤波器的设计原理,提出了一种高性能行波光电探测器阵列新结构。即将两个光电二极管级联后与待设计的滤波电路进行组合形成单个阵列单元,然后把单个阵列单元进行有效级联构成新型行波光电探测器阵列。文章对比分析了新旧行波光电探测器阵列在工作带宽、合成效率、回波损耗3个方面的性能情况。实验结果表明,新型行波光电探测器阵列在合成射频信号输出功率的同时,工作带宽提高至62.5 GHz,是传统行波光电探测器阵列工作带宽的2倍,并且降低了寄生参数带来的影响,性能更加优越。此外,新型行波光电探测器阵列的设计方法可以根据实际设计需求进行调整,设计步骤简练,满足各种工作方式的光电转换需求。

For the status quo of tradition traveling wave detector array which can increase output power but can′t improve work bandwidth,Drawing on the design principle of elliptic function low pass filter,The article proposes a new structure of high performance traveling wave photoelectric detector array.Two photodiodes are cascaded and combined with the filter circuit to be designed to form a single array unit,then a single array element is effectively cascaded to form a novel traveling wave photoelectric detector array.Besides,the article compares and analyzes the performance of the novel and old traveling wave photodetector arrays in terms of working bandwidth,synthesis efficiency and return loss.Experimental results show that novel travelling wave photoelectric detector array increases the working bandwidth to 62.5 GHz while synthesizing RF signal output power,this is twice the operating bandwidth of the conventional traveling wave photoelectric detector array,Besides,Pairwise distribution of inductance and capacitance is also very beneficial to reduce the impact of parasitic parameters,the performance of the whole circuit is superior.In addition,Design scheme of novel travelling wave photodetector array can be adjusted according to the actual design requirements,the design steps are concise and meet the photoelectric conversion needs of various working methods.