Self-calibrating microring synapse with dual-wavelength synchronization
作者机构：Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and TechnologyWuhan 430074China Optics Valley LaboratoryWuhan 430074China Galileo Advanced Technology LabHuawei TechnologiesShenzhen 518129China Institute of Strategic ResearchHuawei TechnologiesShenzhen 518129China
出 版 物：《Photonics Research》 (光子学研究（英文版）)
年 卷 期：2023年第11卷第2期
页 面：347-356页
核心收录：
基 金：National Key Research and Development Program of China(2021YFB2801900,2021YFB2801903) National Natural Science Foundation of China(62075075,62275088,U21A20511) Innovation Project of Optics Valley Laboratory(OVL2021BG001)
主 题：synchronization microring resonator
摘 要：As a resonator-based optical hardware in analog optical computing, a microring synapse can be straightforwardly configured to simulate the connection weights between neurons, but it faces challenges in precision and stability due to cross talk and environmental perturbations. Here, we propose and demonstrate a self-calibration scheme with dual-wavelength synchronization to monitor and calibrate the synaptic weights without interrupting the computation tasks. We design and fabricate an integrated 4 × 4 microring synapse and deploy our self-calibration scheme to validate its effectiveness. The precision and robustness are evaluated in the experiments with favorable performance, achieving 2-bit precision improvement and excellent robustness to environmental temperature fluctuations(the weights can be corrected within 1 s after temperature changes 0.5°C). Moreover, we demonstrate matrix inversion tasks based on Newton iterations beyond 7-bit precision using this microring synapse. Our scheme provides an accurate and real-time weight calibration independently parallel from computations and opens up new perspectives for precision boost solutions to large-scale analog optical computing.
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