High radix, low latency, energy efficient optical switches are essential to sustain the rapid growth in aggregate bandwidth requirements in data centers and high performance computers. Higher port count switches not only permit to interconnect more hosts directly but they also allow more compact topologies involving less links and switches to interconnect large networks. Starting with detailed device models which I have developed and experimentally verified, I analyzed the scalability of silicon photonic microring based switch fabrics with the widely used Benes topology. I was able to estimate the crosstalk and losses of a single chip switch fabric. This allowed me to determine the achievable port count and bandwidth density for these switch fabrics. The surprising conclusion of this was work was that the on-chip waveguide crossings contribute significantly to the scaling of a two dimensional switch fabric
2D switch fabric from double microring switching elements with Benes topology ; top left inset shows picture from a fabricated device; top right - schematics of the operation of the switching element; right inset - picture of a on-chip waveguide crossing; bottom - miltiple crossings model.
I am a scientist and an engineer with wide interests in photonics, optical enineering, deep learning and biology.