Optoelectronic VLSI in the New Age of "Edge" Computing: From LiFi Networks to Wearables and Beyond

Monday, May 6, 2019
11:00 a.m.
2460 A.V. Williams Building
Kara Stamets
301 405 4471
stametsk@umd.edu

Dr. Valencia Joyner Koomson
Department of Electrical and Computer Engineering, Tufts University

Abstract
It is projected that the number of IoT devices will reach 100 billion within the next decade. This exponential growth in demand for connected sensors and wearable computing has accelerated system-on-chip development. Optoelectronic systems will play a major role in this paradigm shift for both sensing and optical wireless networking due to the RF spectrum crunch. In this talk we will present key breakthroughs in the development of optoelectronic VLSI systems for indoor LiFi networking, funded by the NSF Engineering Research Center on Light Enabled Systems & Applications. A digitally-tuned CMOS LED driver circuit architecture, integrating dimming control and advanced multi-carrier data modulation schemes (e.g. orthogonal frequency division multiplexing), is presented. A 600Mb/s visible light communication link demonstration will be discussed. We will present the first demonstration of a 3D heterogeneously integrated optical MIMO receiver combining tessellated InGaAs photodetector arrays with silicon CMOS readout circuitry operating at bit rates > 50Gb/s. Optical MIMO systems combined with space-time coding yield an increase channel capacity and efficiency, as well as, combat scintillation and alignment requirements for free-space optical (FSO) links. We will conclude the presentation by demonstrating disruptive technology at the intersection of electrical engineering and biomedical sciences. We will present a new invention (US Patent No. 10194806) of a wearable optical sensor for real-time measurement of oxygen metabolism in brain tissue.

Biography
Dr. Valencia Joyner Koomson is an Associate Professor in the Department of Electrical and Computer Engineering at Tufts University. She completed the B.S. and M.Eng. degrees in electrical engineering and computer science at the Massachusetts Institute of Technology (MIT) in 1998 and 1999, respectively. She received the Ph.D. degree in electrical engineering from the University of Cambridge, UK in 2003. Dr. Koomson was awarded a Marshall Scholarship and NSF Graduate Research Fellowship to pursue graduate studies at the University of Cambridge. Prior to joining Tufts, Dr. Koomson held an appointment as a VLSI Research Engineer at the University of Southern California’s Information Sciences Institute (USC/ISI), where she performed research on the design of radiation-hardened analog/mixed signal VLSI systemsin CMOS for military and space applications. She held an adjunct faculty appointment in the Howard University Department of Electrical and Computer Engineering in 2005. She has also held visiting appointments at Boston University and Rensselaer Polytechnic Institute. Her research interests are in the design of silicon-based mixed-mode VLSI systems (analog, digital, RF, optical), analog signal processing circuits, millimeter-wave IC design, and optoelectronic system-on-chip modeling and integration for applications in wireless communication and biomedical imaging. In addition to authoring numerous publications and presentations, Dr. Koomson is a 2010 recipient of the NSF Faculty Early Career Development (CAREER) Award. Her research team received the Ricci Interdisciplinary Prize in 2015 and the Tufts $100K New Ventures Competition – 3rd Place prize in Life Sciences. She is an Associate Editor of IEEE Transactions on Circuits and Systems I and a member of technical program committees within several IEEE societies, including the Circuits and Systems Society, Photonics Society, and Women in Engineering.

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