Design of High-Speed UTC-PD With Optimization of Its Electron Transit Performance and Parasitic Capacitance

An 1500nm thick collector layer is adopted in the uni-travelling-carrier photodiode (UTC-PD) to reduce the PD's capacitance, while the PD's diameter is set to be 20μm for better saturation performance and optical coupling characteristic of a signal from a single mode fiber. By optimizing b...

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Bibliographic Details
Published inIEEE photonics journal Vol. 15; no. 1; pp. 1 - 10
Main Authors Dong, Xiaowen, Liu, Kai, Huang, Yongqing, Duan, Xiaofeng, Wang, Qi, Ren, Xiaomin
Format Journal Article
LanguageEnglish
Published Piscataway IEEE 01.02.2023
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Capacitance
Design optimization
Drift
Electric fields
electron transit performance
High speed
high-speed UTC-PD with a diameter of 20 μm
high-speed UTC-PD with a diameter of 20μm
Luminous intensity
Negative differential mobility model
Optical coupling
Optical fibers
Parasitics (electronics)
Photodiodes
Saturation
Universal time
Velocity
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Summary:An 1500nm thick collector layer is adopted in the uni-travelling-carrier photodiode (UTC-PD) to reduce the PD's capacitance, while the PD's diameter is set to be 20μm for better saturation performance and optical coupling characteristic of a signal from a single mode fiber. By optimizing biasing voltage and input light intensity, the electric field intensity in the collector layer would be controlled to make the photo-generated electron in the UTC-PD transiting at around its peak drift velocity in the collector layer and at the same time to make the UTC-PD obtaining it minimum capacitance. Together with the optimization of the doping distribution in UTC-PD's cliff layer and its collector layer, the UTC-PD's high-speed performance and saturation performance can be further improved. An optimized 20μm diameter UTC-PD with a simulated 106GHz 3dB bandwidth and 21.02dBm output RF power at 25GHz is designed. It proposes a discussion to realize high speed, high saturation performance UTC-PD together with high coupling efficiency from a single mode optical fiber by bringing the electric field determined drift velocity performance of its uni-traveling- carrier, the electron, into full play.
ISSN:1943-0655
1943-0647
DOI:10.1109/JPHOT.2023.3234063