"Fault-tolerance and Circuit-rework for Silicon Photonics"

Shayan Mookherjea, Associate Professor, Electrical and Computer Engineering at the University of California, San Diego

February 2nd (Wednesday), 9:00am
Engineering Science Building, Rm 2001

Multi-component on-chip optical networks and systems may be useful for energy-efficient exascale computing. However, unavoidable disorder at the nanometer scale imposes severe constraints on the performance and scalability of silicon photonics. Our group has demonstrated techniques for compensating disorder in as-fabricated devices, and developing large-scale circuits which are disorder-tolerant, and improve performance with scaling up.

We have demonstrated correlated light propagation in record-length 235 coupled ring waveguides (OpEx, 2010, collaboration with IBM Silicon Integrated Nanophotonics group), and have developed novel theoretical insight (OpEx, 2009) and experimental diagnostic methods (OL, 2010, Spotlight in Optics) for multi-component silicon photonic circuits. With collaborators, we have demonstrated nonlinear optics in silicon waveguides at extended (infrared) wavelengths (Nature Photonics, 2010). We have studied the impact of disorder on transport properties, e.g., novel phenomena such as optical localization can be observed in some structures (Nature Photonics, 2008).

Recently, we have demonstrated a “re-working” technology for silicon photonics, allowing post-fabrication set-and-forget tuning of as-fabricated microrings and Mach-Zehnder interferometers to perfect alignment with an ITU-T frequency grid. The trimming may realize substantial energy savings (on the order of Watts) in large-scale silicon photonic circuits, and can also be used for in-the-lab customization of foundry devices.

About Shayan Mookherjea, Associate Professor:

Shayan Mookherjea is Associate Professor of Electrical & Computer Engineering at the University of California, San Diego. He received the BS degree with honors from Caltech (1999), the SM degree from MIT (2000) and the PhD from Caltech (2003) in Electrical Engineering with a minor in Physics. His work is supported by an NSF CAREER award (2007-2012) as well as several other NSF and DoD grants. He has served as Associate Editor of Optics Express, CLEO sub-committee chair for Components, Integration, Interconnects and Signal Processing, and is a member of OSA and a senior member of the IEEE Photonics Society.

Hosted by: Professor John Bowers