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ELEE Research Component of PhD Qualifier Exam by Michael John Benker

When: Friday, January 27, 2023
9:00 AM - 11:00 AM
Where: > See description for location
Cost: Free
Description: Topic: Optical Modulator Design on III-V Semiconductor GaAs/AlGaAs Platforms

Location: Lester W. Cory Conference Room, Science & Engineering Building (SENG), Room 213A

Zoom Conference Link:
Meeting ID: 922 4356 8557 Passcode: 297183

This work aims to demonstrate the viability and advantages of GaAs/AlGaAs optical modulator technology within current state of art. The ternary semiconductor AlGaAs offers a promising hybrid of critical modulator performance metrics including optical insertion loss, Vπ, size, high optical power handling, and compatibility with innovation and research processing in semiconductor technology in Massachusetts. Design techniques for GaAs/AlGaAs modulators will be presented, as well as tradeoffs, and optimization methods. Designs for platforms on several Al concentrations in the ternary III-V compound AlGaAs will be presented. Common bulk LiNbO3 modulators are large (typically 100mm), making them impractical for critically low SWaP use cases. LiNbO3 materials are also not compatible with existing semiconductor processing for III-V compounds. InP, on the other hand, is compatible with semiconductor optoelectronics and high-speed electronics manufacturing methods, and offers a small design, however it is not able to accept high optical power (typically only tens of mW), leaving it unviable in applications which use high optical power.

Advisor(s): Dr. Yifei Li, Professor, Department of Electrical & Computer Engineering, UMASS Dartmouth

Committee Members: Dr. Dayalan Kasilingam, Professor, Department of Electrical & Computer Engineering, UMASS Dartmouth; Dr. Mohammad A. Karim, Professor, Department of Electrical & Computer Engineering, UMASS Dartmouth; Dr. Tariq Manzur, Adjunct Professor, Department of Electrical & Computer Engineering, UMASS Dartmouth; Scientist & Engineer, Naval Undersea Warfare Center (NUWC)

NOTE: All ECE Graduate Students are ENCOURAGED to attend. All interested parties are invited to attend. Open to the public.

*For further information, please contact Dr. Yifei Li via email at
Contact: > See Description for contact information
Topical Areas: General Public, University Community, College of Engineering, Electrical and Computer Engineering