基于偏振动力学的全光储备池计算系统  

All-optical reservoir computing system based on polarization dynamics

作　　者：方捻[1] 钱若兰 王帅[1] Fang Nian;Qian Ruo-Lan;Wang Shuai(Key Laboratory of Specialty Fiber Optics and Optical Access Networks,Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学,特种光纤与光接入网重点实验室,特种光纤与先进通信国际合作联合实验室,上海200444

出　　处：《物理学报》2023年第21期225-235,共11页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:62075123);高等学校学科创新引智计划(111)(批准号:D20031)资助的课题.

摘　　要：在半导体光放大器光纤环形激光器的基础上,提出一种基于偏振动力学的全光储备池计算系统.实验分析了该激光器的偏振动力学状态响应的影响因素,且结合储备池基本属性确定了系统参数的选取范围.通过处理Santa Fe时间序列预测任务和多波形识别任务来评估该储备池计算系统的网络性能.在合适的系统参数下,仅用30个虚节点,时间序列预测任务的归一化均方误差可低至0.0058,识别任务的识别率可高达100%.实验结果表明,该偏振动力学储备池计算系统具有良好的预测性能和分类能力,且与已有的基于该环形激光器的强度动力学储备池计算系统的性能相当.该工作为光储备池计算神经网络的研究提供了新的思路.当其偏振动力学和强度动力学一起使用时,该系统有望实现两个任务的并行处理.Reservoir computing(RC)is a simplified recurrent neural network and can be implemented by using a nonlinear system with delay feedback,thus it is called delay-based RC.Various nonlinear nodes and feedback loop structures have been proposed.Most of existing researches are based on the dynamical responses in intensity of the nonlinear systems.There are also a photoelectric RC system based on wavelength dynamics and an all-optical RC based on the phase dynamics of a semiconductor laser with optical feedback,as well as socalled polarization dynamics of a vertical cavity surface emitting laser(VCSEL).However,these VCSEL-RCs actually are based on the intensity dynamics of two mutually orthogonal polarization modes,or polarizationresolved intensity dynamics.The RC based on rich dynamical responses in polarization has not yet been found.A semiconductor optical amplifier(SOA)fiber ring laser can produce rich dynamical states in polarization,and is used in optical chaotic secure communication and distributed optical fiber sensing.To further expand the application of polarization dynamics of the SOA fiber ring laser and open up a new direction for the research of optical RC neural network,an all-optical RC system based on polarization dynamics of the ring laser is proposed.The ring laser is used as the reservoir,and the SOA as the nonlinear node.After the input signal is masked according to a synchronization scheme,it is injected into the reservoir by intensity modulation for a continuous wave generated by a superluminescent light emitting diode(SLED).The dynamical response in polarization of the ring laser is detected by a polarizer and a photodetector.The influences of the SOA operation current,output power of the SLED and attenuation of a variable optical attenuator(VOA)in the fiber loop on the polarization dynamic characteristic(mainly referring to the output degree of polarization)of the laser are analyzed experimentally.The fading memory and nonlinear response of the RC system based on the polarization dynamic respons

关 键 词：储备池计算 偏振动力学 光纤环形激光器 半导体光放大器 

分 类 号：TN248[电子电信—物理电子学] TP183[自动化与计算机技术—控制理论与控制工程]