Photonic integrated spiking neuron chip based on a self-pulsating DFB laser with a saturable absorber  

作　　者：YUECHUN SHI SHUIYING XIANG XINGXING GUO YAHUI ZHANG HONGJI WANG DIANZHUANG ZHENG YUNA ZHANG YANAN HAN YONG ZHAO XIAOJUN ZHU XIANGFEI CHEN XUN LI YUE HAO 

机构地区：[1]Yongjiang Laboratory,Ningbo 315202,China [2]State Key Laboratory of Integrated Service Networks,State Key Discipline Laboratory of Wide Bandgap Semiconductor Technology,Xidian University,Xi’an 710071,China [3]Key Laboratory of Intelligent Optical Sensing and Manipulation,Ministry of Education,National Laboratory of Solid State Microstructures,College of Engineering and Applied Sciences,Institute of Optical Communication Engineering,Nanjing University,Nanjing 210023,China [4]School of Science,Jiangnan University,Wuxi 214122,China [5]School of Information Science and Technology,Nantong University,Nantong 226019,China [6]Department of Electrical and Computer Engineering,McMaster University,Hamilton,Oantario L8S 4K1,Canada

出　　处：《Photonics Research》2023年第8期1382-1389,共8页光子学研究（英文版）

基　　金：National Key Research and Development Program of China(2021YFB2801900,2021YFB2801902,2021YFB2801904,2018YFE0201200);National Outstanding Youth Science Fund of National Natural Science Foundation of China(62022062);National Natural Science Foundation of China(61974177);Fundamental Research Funds for the Central Universities(QTZX23041)。

摘　　要：We proposed and experimentally demonstrated a simple and novel photonic spiking neuron based on a distributed feedback(DFB)laser chip with an intracavity saturable absorber(SA).The DFB laser with an intracavity SA(DFBSA)contains a gain region and an SA region.The gain region is designed and fabricated by the asymmetric equivalentπ-phase shift based on the reconstruction-equivalent-chirp technique.Under properly injected current in the gain region and reversely biased voltage in the SA region,periodic self-pulsation was experimentally observed due to the Q-switching effect.The self-pulsation frequency increases with the increase of the bias current and is within the range of several gigahertz.When the bias current is below the self-pulsation threshold,neuronlike spiking responses appear when external optical stimulus pulses are injected.Experimental results show that the spike threshold,temporal integration,and refractory period can all be observed in the fabricated DFB-SA chip.To numerically verify the experimental findings,a time-dependent coupled-wave equation model was developed,which described the physics processes inside the gain and SA regions.The numerical results agree well with the experimental measurements.We further experimentally demonstrated that the weighted sum output can readily be encoded into the self-pulsation frequency of the DFB-SA neuron.We also benchmarked the handwritten digit classification task with a simple single-layer fully connected neural network.By using the experimentally measured dependence of the self-pulsation frequency on the bias current in the gain region as an activation function,we can achieve a recognition accuracy of 92.2%,which bridges the gap between the continuous valued artificial neural networks and spike-based neuromorphic networks.To the best of our knowledge,this is the first experimental demonstration of a photonic integrated spiking neuron based on a DFB-SA,which shows great potential to realizing large-scale multiwavelength photonic spiking neural network chi

关 键 词：technique LASER saturable 

分 类 号：TN40[电子电信—微电子学与固体电子学] TN248