叉状光电探测器阵列电极的设计与优化  

Design and Optimization of Forked Photodiode Array Electrodes

作　　者：焦泓玮 黄永清[1] 赵康[1] 段晓峰[1] 刘凯[1] 任晓敏[1] JIAO Hong-wei;HUANG Yong-qing;ZHAO Kang;DUAN Xiao-feng;LIU Kai;REN Xiao-min(State Key Laboratory of Information Photonics and Optical Communications,Beijing University of Posts and Telecommunications,Beijing 100876,China)

机构地区：[1]北京邮电大学信息光子学与光通信国家重点实验室

出　　处：《光子学报》2019年第11期170-176,共7页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.61574019,61674018,61674020);信息光子学与光通信国家重点实验室基金;高等学校博士学科点专项科研基金(No.20130005130001)~~

摘　　要：针对行波光电探测器阵列(TW-PDA)的传输时延导致各路电信号在输出终端产生相位失配,影响整体频率响应的问题,提出了一种叉状光电探测器阵列(F-PDA)的电极结构.该电极采用对称连接结构代替TW-PDA的逐级连接结构的方法,使得各路光电探测器单元与信号输出终端的距离保持一致,从而克服传统结构中由于传输时延带来的一系列问题.电极的结构参数经HFSS进行设计并优化后,在100 GHz内的最大插入损耗不超过1.5 dB,特征阻抗稳定于50Ω左右.实验结果表明,制备的TW-PDA在40 GHz下的插入损耗约2.5 dB,3 dB带宽约6.9 GHz;而F-PDA对应的测试结果分别约1.36 dB以及13.8 GHz.相比而言,本文提出的结构存在明显的性能提升.A Forked Photodiode Array(F-PDA)electrodes were presented to address the issues brought by transmission delay of traditional Traveling-Wave Phohodiode Array(TW-PDA),which cause phase-mismatches of electrical signals and affect the overall frequency response.This design overcomes the problems cited above by using a symmetric-connected structure instead of the cascade-connected structure of TW-PDA to ensure that the terminal pad is equidistant from each unit.The structural parameter of F-PDA is simulated and optimized by using simulation software HFSS.In the simulation,the characteristic impedance is kept at about 50Ωand the insertion loss is less than 1.5 dB within the boundary of 100 GHz.Traditional and forked structures were fabricated and tested in experiment.The results show that the forked structure has a better performance compared with the traditional structure.At 40 GHz,the later has an insertion loss of 2.5 dB and a 3 dB bandwidth of 6.9 GHz,correspondingly,the properties of the former are 1.36 dB and 13.8 GHz.

关 键 词：光电探测器阵列 电极 共面波导 插入损耗 光载无线 

分 类 号：TN29[电子电信—物理电子学]