Two-pole microring weight banks

Alexander N. Tait, Allie X. Wu, Thomas Ferreira De Lima, Mitchell A. Nahmias, Bhavin J. Shastri, Paul R. Prucnal

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


Weighted addition is an elemental multi-input to single-output operation that can be implemented with high-performance photonic devices. Microring (MRR) weight banks bring programmable weighted addition to silicon photonics. Prior work showed that their channel limits are affected by coherent inter-channel effects that occur uniquely in weight banks. We fabricate two-pole designs that exploit this inter-channel interference in a way that is robust to dynamic tuning and fabrication variation. Scaling analysis predicts a channel count improvement of 3.4-fold, which is substantially greater than predicted by incoherent analysis used in conventional MRR devices. Advances in weight bank design expand the potential of reconfigurable analog photonic networks and multivariate microwave photonics.

Original languageEnglish (US)
Pages (from-to)2276-2279
Number of pages4
JournalOptics Letters
Issue number10
StatePublished - May 15 2018

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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