集成光子储备池的可调谐光滤波器  

Tunable optical filter with integrated photonic reservoir computing

作　　者：李文璐 裴丽[1,2] 白冰 左晓燕 王建帅[1,2] 郑晶晶[1,2] 李晶[1,2] 宁提纲[1,2] Li Wenlu;Pei Li;Bai Bing;Zuo Xiaoyan;Wang Jianshuai;Zheng Jingjing;Li Jing;Ning Tigang(Key Laboratory of All-Optical Network and Advanced Telecommunication Network,Ministry of Education,Beijing Jiaotong University,Beijing 100044,China;Institute of Lightwave Technology,Beijing Jiaotong University,Beijing 100044,China;Photocounts Co.,Ltd.,Beijing 100080,China)

机构地区：[1]北京交通大学全光网络与现代通信网教育部重点实验室,北京100044 [2]北京交通大学光波技术研究所,北京100044 [3]光子算数(北京)科技有限责任公司,北京100080

出　　处：《红外与激光工程》2023年第9期262-272,共11页Infrared and Laser Engineering

基　　金：国家自然科学基金项目(62235003)。

摘　　要：为了适应滤波、波分复用等不同的应用场景,光子滤波器需要具备可调谐以及滤波形状可变的功能。提出一种集成光子储备池结构的新型可调谐光滤波器。该结构由输入层、储层、读出层三部分组成,输入层由2×1多模干涉仪组成,储层由定向耦合器以及波导组成,按螺旋拓扑规律相互连接组成梅花型网格,匹配粒子群寻优算法进行全光域训练,利用读出层的热光调制器和相移器对光信号的幅度和相位进行调整,实现无限冲激响应型与有限冲激响应型可调谐光滤波器。以无限冲激响应型光滤波器仿真结果为例,分析其自由光谱范围与储层中波导长度的关系,以及定向耦合器分光比对透射端透过率的影响。通过设置储层中波导的相位在0~3/2π范围内变化,实现了光滤波器中心波长在一个自由光谱范围(1.18 nm)内的连续可调。该滤波器采用集成光子储备池与粒子群算法结合方案设计,无需考虑储层光网络传输路径的权重配置,仅对读出层权重进行训练,大大简化了网络训练过程。同时,该滤波器具有尺寸小、功耗低、灵活性高、算法可控滤波参数的优势,广泛应用于集成微波光子学和光通信领域中。Objective A tunable optical filter is the key component in the optical communication systems and optical processing systems.By tuning the central wavelength,it can be used to choose a signal with arbitrary wavelength according to the practical requirement.However,due to the high loss and large size,optical filter based on discrete devices cannot meet the requirements of some photonic signal processor.Recently,based on Mach-Zehnder interferometers network and ring-assisted Mach-Zehnder interferometer,some research groups have proposed integrated optical filter.However,this type of optical filter has the disadvantages of being difficult to train and having a single waveform,which restricts its application in the fields of multi-purpose adaptive signal processing.For improving the flexibility of optical filter,a novel tunable optical filter with an integrated photonic reservoir computing(RC)is proposed.Since the filtering properties can be controlled by intelligence algorithm,this optical filter,which improves the flexibility in applications,can be widely applied in optical cross interconnection system and microwave photon signal shaping.Methods Firstly,the structure of integrated photonic RC is constructed in detail,and scattering matrix theory is used to analyze the transmission function of integrated photonic RC.Then,the simulated transmission spectra of the reservoir are carried out by simulation software.Particle swarm optimization(PSO)algorithm is matched for training reservoir transmission spectra in optical domain to find optimal weights.Based on thermo-optical effects,optical weights are implemented by optical modulators(OMs).During training the weights in readout layer,OMs are used to adjust the amplitudes and phases of the optical signal.Using this integrated photonic RC chip,the infinite(IIR)and finite(FIR)impulse response optical filters are realized.Finally,by adjusting the parameters of waveguide(WG)and directional coupler(DC)in the reservoir,the filtering properties is studied.Results and Discussions

关 键 词：集成光学 可调谐光滤波器 光子储备池 粒子群算法 

分 类 号：TN256[电子电信—物理电子学]