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arXiv 2012.10594cs.ETcs.LGphysics.optics
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Modeling Silicon-Photonic Neural Networks under Uncertainties

Duke University(杜克大学);Colorado State University(科罗拉多州立大学)

Sanmitra Banerjee, Mahdi Nikdast, Krishnendu Chakrabarty

英文摘要:

Silicon-photonic neural networks (SPNNs) offer substantial improvements in computing speed and energy efficiency compared to their digital electronic counterparts. However, the energy efficiency and accuracy of SPNNs are highly impacted by uncertainties that arise from fabrication-process and thermal variations. In this paper, we present the first comprehensive and hierarchical study on the impact of random uncertainties on the classification accuracy of a Mach-Zehnder Interferometer (MZI)-based SPNN. We show that such impact can vary based on both the location and characteristics (e.g., tuned phase angles) of a non-ideal silicon-photonic device. Simulation results show that in an SPNN with two hidden layers and 1374 tunable-thermal-phase shifters, random uncertainties even in mature fabrication processes can lead to a catastrophic 70% accuracy loss.

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