High speed and high power polarization insensitive germanium photodetector with lumped structure

被引:23
作者
Chen, Guanyu [1 ,2 ]
Yu, Yu [1 ,2 ]
Xiao, Xi [3 ]
Zhang, Xinliang [1 ,2 ]
机构
[1] Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, Wuhan 430074, Peoples R China
[2] Huazhong Univ Sci & Technol, Sch Optoelect Sci & Engn, Wuhan 430074, Peoples R China
[3] Wuhan Res Inst Posts Telecommun, State Key Lab Opt Commun Technol & Networks, Wuhan 430074, Peoples R China
来源
OPTICS EXPRESS | 2016年 / 24卷 / 09期
基金
中国国家自然科学基金;
关键词
WAVE-GUIDE PHOTODIODE; MICROWAVE PHOTONICS; PERFORMANCE; RESPONSIVITY; DESIGN;
D O I
10.1364/OE.24.010030
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We propose and demonstrate a high speed and high power polarization insensitive germanium photodetector (Ge PD) with lumped structure based on related parallel Ge absorption regions. Two absorption regions are double sides illuminated to optimize the space charge density and the two dimensional (2D) grating coupler is adopted for both coupling and polarization independent operation. Being different from previous reported high power scheme with separate absorption areas, the proposed structure is specifically designed with doubled but related Ge absorption regions, forming the equivalent parallel resistor and thus the parasitic parameter can be engineered to ensure a simultaneous large bandwidth. The bandwidth is measured to be >35 GHz, while the maximum current density is measured to be 1.152 mA/mu m(3). The dark current and the responsivity of the proposed Ge PD are measured to be 1.82 mu A and 1.06 A/W. Modulated signals experimentally validate the high speed operation and doubled power handling capacity for the proposed scheme. Furthermore, the bit error rate results show the superior performance for the proposed Ge PD at high photocurrent. (C) 2016 Optical Society of America
引用
收藏
页码:10030 / 10039
页数:10
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