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Bandwidth improvement of high power uni-traveling-carrier photodiodes by reducing the series resistance and capacitance |
Li Jin (李进), Xiong Bing (熊兵), Sun Chang-Zheng (孙长征), Luo Yi (罗毅), Wang Jian (王健), Hao Zhi-Biao (郝智彪), Han Yan-Jun (韩彦军), Wang Lai (汪莱), Li Hong-Tao (李洪涛) |
Tsinghua National Laboratory for Information Science and Technology/State Key Laboratory on Integrated Optoelectronics, Department of Electronic Engineering, Tsinghua University, Beijing 100084, China |
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Abstract A backside illuminated mesa-structure InGaAs/InP modified uni-traveling-carrier photodiode (MUTC-PD) with wide bandwidth and high saturation power is fabricated and investigated. The device structure is optimized to reduce the capacitance and resistance. For the 22-μm-diameter device, the maximum responsivity at 1.55 μm is 0.5 A/W, and the 3-dB cutoff frequency reaches up to 28 GHz. The output photocurrent at the 1-dB compression point is measured to be 54 mA at 25 GHz, with a corresponding output radio frequency (RF) power of up to 15.5 dBm. The saturation characteristics of the MUTC-PD are also verified by the electric field simulation, and electric field collapse is found to be the cause of the saturation phenomenon.
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Received: 01 February 2015
Revised: 25 March 2015
Accepted manuscript online:
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PACS:
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85.60.Gz
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(Photodetectors (including infrared and CCD detectors))
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78.55.Cr
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(III-V semiconductors)
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85.30.De
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(Semiconductor-device characterization, design, and modeling)
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Fund: Project supported by the National Basic Research Program of China (Grant Nos. 2012CB315605 and 2014CB340002), the National Natural Science Foundation of China (Grant Nos. 61176015, 61176059, 61210014, 61321004, and 61307024), and the Open Fund of State Key Laboratory on Integrated Optoelectronics, China (Grant Nos. IOSKL2012KF08 and IOSKL2014KF09). |
Corresponding Authors:
Xiong Bing, Luo Yi
E-mail: bxiong@tsinghua.edu.cn;luoy@tsinghua.edu.cn
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Cite this article:
Li Jin (李进), Xiong Bing (熊兵), Sun Chang-Zheng (孙长征), Luo Yi (罗毅), Wang Jian (王健), Hao Zhi-Biao (郝智彪), Han Yan-Jun (韩彦军), Wang Lai (汪莱), Li Hong-Tao (李洪涛) Bandwidth improvement of high power uni-traveling-carrier photodiodes by reducing the series resistance and capacitance 2015 Chin. Phys. B 24 078503
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