Development of high-speed pin photodiode and vertical-cavity surface-emitting laser for extended-reach optical communications
Wu, Dufei
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https://hdl.handle.net/2142/120338
Description
Title
Development of high-speed pin photodiode and vertical-cavity surface-emitting laser for extended-reach optical communications
Author(s)
Wu, Dufei
Issue Date
2023-02-22
Director of Research (if dissertation) or Advisor (if thesis)
Feng, Milton
Doctoral Committee Chair(s)
Feng, Milton
Committee Member(s)
Dragic, Peter D
Goddard, Lynford L
Jin, Jianming
Department of Study
Electrical & Computer Eng
Discipline
Electrical & Computer Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Semiconductor, Laser, Photodiode, Fabrication, Microwave, Data Communication
Abstract
Semiconductor optical devices such as GaAs photodiodes and VCSELs have been widely deployed in data centers for optical communications due to their low cost and high-reliability features. They are crucial in implementing high-speed optical data links for data transmission.
The PIN photodiode (PD) commonly serves as the receiver device in optical communications. With low leakage current, they can achieve high sensitivity and low noise. Design considerations of the PDs mainly focus on the intrinsic absorption layer and physical device structure to achieve high responsivity and bandwidth. This work discusses fabrication and process optimization to achieve enhanced device performance. A small-signal model is also established to verify and predict PD performance and assist the design process.
The vertical-cavity surface-emitting laser (VCSEL) is a semiconductor laser that emits modulated optical signals for low-loss transmission over optical channels. The transmission distance of VCSELs is typically limited to below 100m due to its multimode nature. In this work, it will be demonstrated that mode control may be achieved with a modified aperture and reflective DBR mirror design. The subject of this work is the process development, fabrication, and characterization of IMSF VCSELs to perform single-model operations. The small-signal & large-signal testing will be discussed. And finally, the recombination process enhancement will be demonstrated by combining the microwave modeling and measurement of VCSELs to point out potential further applications in a cryogenic environment.
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