Photonic neural networks have garnered significant attention in recent years due to their ultra-high computational speed,broad bandwidth,and parallel processing capabilities.However,compared to conventional electronic...Photonic neural networks have garnered significant attention in recent years due to their ultra-high computational speed,broad bandwidth,and parallel processing capabilities.However,compared to conventional electronic nonlinear activa-tion function(NAF),progress on efficient and easily implementable optical nonlinear activation function(ONAF)was barely reported.To address this issue,we proposed a programmable,low-loss ONAF device based on a silicon micro-ring resonator capped with the Antimony selenide(Sb_(2)Se_(3))thin films,and with indium tin oxide(ITO)used as the microheater.Leveraging our self-developed phase-transformation kinetic and optical models,we successfully simulated the phase-transition behavior of Sb_(2)Se_(3)and three different ONAFs—ELU,ReLU,and radial basis function(RBF)were achieved according to discernible optical responses of proposed devices under different phase-change extents.Classification results from the Fashion MNIST dataset demonstrated that these ONAFs can be considered as appropriate substitutes for traditional NAF.This indicated the bright prospect of the proposed device for nonlinear activation function in future photonic neural networks.展开更多
Quantum photonic integrated circuits offer enhanced stability and scalability for quantum communications,sensing, and computing. Transverse modes in multimode waveguides enable high-dimensional scalability and versati...Quantum photonic integrated circuits offer enhanced stability and scalability for quantum communications,sensing, and computing. Transverse modes in multimode waveguides enable high-dimensional scalability and versatile photon manipulation, but practical adoption requires compact and fabrication-tolerant quantum interference devices. Here, we present an ultra-compact taper-stepped beamsplitter that enables quantum interference between photon pairs in different transverse modes, and cascade it to realize NOON state interferometry. We experimentally achieve high visibilities of 93.9% for HOM interference and 86.5% for NOON state interference,demonstrating that efficient mode interference with active tuning can be realized on this platform.展开更多
研究了光电探测器(PD)的结构、性能以及后续放大电路,实现了塑料光纤通信的高速单片集成光接收芯片。首先,根据工艺流程和参数,采用器件模拟软件对PD结构进行了建模,并对其光谱响应度和结电容进行了理论推导及仿真。基于Cadence/spectr...研究了光电探测器(PD)的结构、性能以及后续放大电路,实现了塑料光纤通信的高速单片集成光接收芯片。首先,根据工艺流程和参数,采用器件模拟软件对PD结构进行了建模,并对其光谱响应度和结电容进行了理论推导及仿真。基于Cadence/spectre软件和仿真得到的PD参数对由跨阻放大器、限幅放大器和输出缓冲电路组成的后续放大电路进行了协同设计。采用0.5μm BCD(Bipolar,CMOS and DMOS)工艺对单个PD以及PD和后续放大电路单片集成电路进行了流片、封装和测试。结果表明:PD的光谱响应曲线的峰值波长和仿真结果较一致,约为700nm,PD结构更适合短波长探测;PD的结电容随着反向电压的增大而减小,结电容越大,光接收芯片的带宽越小;对于650nm的入射光,在小于10-9的误码率条件下,光接收机的灵敏度为-14dBm;最后得到了150Mb/s速率的清晰眼图。实验结果显示,设计的高速单片集成光接收机可以应用于百兆速率光纤入户通信系统。展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.62104114,62404111)Natural Science Foundation of Jiangsu Province(Grant Nos.BK20240635,BZ2021031)+4 种基金Opening Project of Advanced Integrated Circuit Package and Testing Research Center of Jiangsu Province(Grant No.NTIKFJJ202303)Natural Science Foundation of the Jiangsu Higher Education Institutions of China(Grant No.24KJB510025)Natural Science Research Start-up Foundation of Recruiting Talents of Nanjing University of Posts and Telecommunications(Grant Nos.NY223157,NY223156)Natural Science Foundation of Nanjing University of Posts and Telecommunications(Grant No.NY224140)Project funded by China Postdoctoral Science Foundation(Grant No.2023M732916).
文摘Photonic neural networks have garnered significant attention in recent years due to their ultra-high computational speed,broad bandwidth,and parallel processing capabilities.However,compared to conventional electronic nonlinear activa-tion function(NAF),progress on efficient and easily implementable optical nonlinear activation function(ONAF)was barely reported.To address this issue,we proposed a programmable,low-loss ONAF device based on a silicon micro-ring resonator capped with the Antimony selenide(Sb_(2)Se_(3))thin films,and with indium tin oxide(ITO)used as the microheater.Leveraging our self-developed phase-transformation kinetic and optical models,we successfully simulated the phase-transition behavior of Sb_(2)Se_(3)and three different ONAFs—ELU,ReLU,and radial basis function(RBF)were achieved according to discernible optical responses of proposed devices under different phase-change extents.Classification results from the Fashion MNIST dataset demonstrated that these ONAFs can be considered as appropriate substitutes for traditional NAF.This indicated the bright prospect of the proposed device for nonlinear activation function in future photonic neural networks.
基金supported by the National Key Research and Development Program of China (Grant No.2022YFB2803100)the National Major Scientific Research Instrument Development Project(Grant No.22127901)+6 种基金the National Natural Science Foundation of China (Grant No.62305367)the Shanghai Natural Science Foundation (Grant No.25ZR1401379)the Natural Science Foundation of Zhejiang Province,China (Grant No.LZ24F050001)the Innovation Program for Quantum Science and Technology (Grant Nos.2021ZD0301500 and 2021ZD0303200)the National Natural Science Foundation of China (Grant Nos.T2325022,U23A2074,62061160487,and 62275240)the CAS Project for Young Scientists in Basic Research(Grant No.YSBR-049)the Fundamental Research Funds for the Central Universities。
文摘Quantum photonic integrated circuits offer enhanced stability and scalability for quantum communications,sensing, and computing. Transverse modes in multimode waveguides enable high-dimensional scalability and versatile photon manipulation, but practical adoption requires compact and fabrication-tolerant quantum interference devices. Here, we present an ultra-compact taper-stepped beamsplitter that enables quantum interference between photon pairs in different transverse modes, and cascade it to realize NOON state interferometry. We experimentally achieve high visibilities of 93.9% for HOM interference and 86.5% for NOON state interference,demonstrating that efficient mode interference with active tuning can be realized on this platform.
文摘研究了光电探测器(PD)的结构、性能以及后续放大电路,实现了塑料光纤通信的高速单片集成光接收芯片。首先,根据工艺流程和参数,采用器件模拟软件对PD结构进行了建模,并对其光谱响应度和结电容进行了理论推导及仿真。基于Cadence/spectre软件和仿真得到的PD参数对由跨阻放大器、限幅放大器和输出缓冲电路组成的后续放大电路进行了协同设计。采用0.5μm BCD(Bipolar,CMOS and DMOS)工艺对单个PD以及PD和后续放大电路单片集成电路进行了流片、封装和测试。结果表明:PD的光谱响应曲线的峰值波长和仿真结果较一致,约为700nm,PD结构更适合短波长探测;PD的结电容随着反向电压的增大而减小,结电容越大,光接收芯片的带宽越小;对于650nm的入射光,在小于10-9的误码率条件下,光接收机的灵敏度为-14dBm;最后得到了150Mb/s速率的清晰眼图。实验结果显示,设计的高速单片集成光接收机可以应用于百兆速率光纤入户通信系统。
