Department of Physics, Engineering Physics & Astronomy

Department of Physics, Engineering Physics & Astronomy
Department of Physics, Engineering Physics & Astronomy

Departmental Colloquium - Reconfigurable Photonic Integrated Circuits

Bhavin Shastri,
Associate Research Scholar and Banting Fellow,
Princeton University

Monday July 10th, 2017
11:00 a.m. Stirling A

Abstract:

This talk will describe my recent work to develop reconfigurable photonic integrated circuits for information processing. Driven by incipient limitations in aspects of Moore’s law, there has recently been a renewed investigation of non-von Neumann computer architectures and CMOS-compatible photonic interconnect manufacturing. Neural-inspired architectures decentralize processing—a move that intimately intertwines interconnection with computing—in addition to incorporating time-resolved dynamics, loosely classified as spiking. The coincidence of these technologies has opened vast unexplored opportunities for optics in unconventional circuits and systems.

The first part of the talk will focus on a class of pulsed lasers “spiking lasers” that exhibit excitability and classify as dynamical light-matter processing devices. Using graphene-based excitable lasers, we have demonstrated critical prerequisites for scalable information processing (logic-level restoration, cascadability), in addition to simple neuromorphic processing tasks, including temporal pattern detection and stable recurrent memory. The second part of the talk will cover analog optical networks on chip. Scalable and fully reconfigurable networks of spike primitives can be implemented in the silicon photonic layer of modern hybrid photonic integration platforms, in which spiking lasers in a bonded indium phosphide layer are densely interconnected through a silicon layer. We envision that these chips will be able to support several thousand interconnected photonic spike primitives in near future, enough to implement algorithms for applications such as navigation control on hypersonic aircrafts, and real-time sensing and analysis of the radio spectrum.

Short Bio:

Bhavin Shastri is an Associate Research Scholar and Banting Fellow at Princeton University in Prof. Paul Prucnal's lab. He received his Ph.D. in electrical engineering (photonics) from McGill University, Montreal, Canada, in 2012. Dr. Shastri is a recipient of the Banting Postdoctoral Fellowship from the Government of Canada, the 2012 D. W. Ambridge Prize for the top graduating Ph.D. student, a nomination for the 2012 Canadian Governor General’s Gold Medal, and an IEEE Photonics Society 2011 Graduate Student Fellowship, including the Best Student Paper Awards at the 2010 IEEE Midwest Symposium on Circuits and Systems, the 2004 IEEE Computer Society Lance Stafford Larson Outstanding Student Award, and the 2003 IEEE Canada Life Member Award. Dr. Shastri is a co-author of the book, Neuromorphic Photonics (Taylor & Francis, CRC Press).