Fig. 3 Synaptic weighting and plasticity.

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Presentation transcript:

Fig. 3 Synaptic weighting and plasticity. Synaptic weighting and plasticity. (A) Demonstration of differential synaptic weighting of the device in Fig. 1 during switching between the crystalline and amorphous states of GST islands with the relative transmission change (ΔT/T0) recorded. Each weight can be reached with the same number of pulses (50 ns at 243 pJ, 1 MHz) from any previous weight. (B) Repeatability of the weighting over multiple cycles. Inset: Statistical analysis of the change in readout for weight “0,” “1,” and “4.” The pulse applied here was 50 ns at 320 pJ, slightly larger than that in (A). (C) Five weights of the photonic synapse are obtained with switching at optical pulse energy (404.5 pJ, 50 ns). The dashed blue (yellow) boxes correspond to the first (last) weighting cycle. The upward and downward arrows in the boxes are the weighting directions. (D) Photonic synaptic weight (ΔT/T0) as a function of optical pulse numbers. The left (right) panel corresponds to the data of the dashed blue (yellow) box in (C). The solid triangles (hollow boxes) are the data from the upward (downward) weighting direction. The dashed lines are the exponential fittings of the data with detailed fitting parameters elucidated in table S2. Zengguang Cheng et al. Sci Adv 2017;3:e1700160 Copyright © 2017 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY).