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| 1 | Compact, submilliwatt, 2 × 2 silicon thermo-optic switch based on photonic crystal nanobeam cavities显示文摘We propose and experimentally demonstrate a 2×2 thermo-optic(TO) crossbar switch implemented by dual photonic crystal nanobeam(PCN)cavities within a silicon-on-insulator(SOI)platform.By thermally tuning the refractive index of silicon,the resonance wavelength of the PCN cavities can be red-shifted.With the help of the ultrasmall mode volumes of the PCN cavities,only~0.16 mW power is needed to change the switching state.With a spectral passband of 0.09 nm at the 1583.75 nm operation wavelength,the insertion loss(IL)and crosstalk(CT)performances were measured as IL(bar)=-0.2 dB,CT(bar)=-15 dB,IL(cross)=-1.5 dB,and CT(cross)=-15 dB.Furthermore,the thermal tuning efficiency of the fabricated device is as high as1.23 nm/mW. | HUANYING ZHOU CIYUAN QIU XINHONG JIANG QINGMING ZHU YU HE YONG ZHANG YIKAI SU RICHARD SOREF | 2017 | Photonics Research2017，5，2： | 8 |
| 2 | On-chip silicon photonic 2 × 2 mode-and polarization-selective switch with low inter-modal crosstalk显示文摘Mode-and polarization-division multiplexing offer new dimensions to increase the transmission capacity of optical communications. Selective switches are key components in reconfigurable optical network nodes. An on-chip silicon 2 × 2 mode-and polarization-selective switch that can route four data channels on two modes and two polarizations simultaneously is proposed and experimentally demonstrated for the first time, to the best of our knowledge. The overall insertion losses are lower than 8.6 d B. To reduce the inter-modal crosstalk, polarization beam splitters are added to filter the undesired polarizations or modes. The measured inter-modal andintra-modal crosstalk values are below-23.2 and-22.8 d B for all the channels, respectively. | YONG ZHANG YU HE QINGMING ZHU CIYUAN QIU YIKAI SU | 2017 | Photonics Research2017，5，5： | 7 |
| 3 | Recent advances of heterogeneously integrated Ⅲ–Ⅴ laser on Si显示文摘Due to the indirect bandgap nature,the widely used silicon CMOS is very inefficient at light emitting.The integration of silicon lasers is deemed as the‘Mount Everest’for the full take-up of Si photonics.The major challenge has been the materials dissimilarity caused impaired device performance.We present a brief overview of the recent advances of integratedⅢ-Ⅴlaser on Si.We will then focus on the heterogeneous direct/adhesive bonding enabling methods and associated light coupling structures.A selected review of recent representative novel heterogeneously integrated Si lasers for emerging applications like spectroscopy,sensing,metrology and microwave photonics will be presented,including DFB laser array,ultra-dense comb lasers and nanolasers.Finally,the challenges and opportunities of heterogeneous integration approach are discussed. | Xuhan Guo An He Yikai Su | 2019 | Journal of Semiconductors2019，40，10： | 3 |
| 4 | A flexible multi-16QAM transmitter based on cascaded dual-parallel Mach-Zehnder modulator and phase modulator显示文摘In this paper,we propose a novel and flexible 16-quadrature amplitude modulation(16QAM) transmitter based on cascaded dual-parallel Mach-Zehnder modulator(DPMZM) and phase modulator(PM).The proposed transmitter is able to generate three types of 16QAM signals:square 16QAM,star 16QAM and four-amplitude-four-phase-16-QAM(FAFP-16QAM).The feasibility of the transmitter is verified through experiment,20-Gb/s eye diagrams of the 16QAM signals are obtained.In order to evaluate the performances of the 16QAM signals,simulations are also conducted using VPI Transmission Maker,clear constellations of 40-Gb/s 16QAM signals are achieved by coherent detection. | ZHANG Liang HU XiaoFeng CAO Pan ZHUANG ZhiMing JIANG XinHong SU YiKai | 2013 | Chinese Science Bulletin2013，58，7： | 3 |
| 5 | Multi-channel 28-GHz millimeter-wave signal generation on a silicon photonic chip with automated polarization control显示文摘We propose and experimentally demonstrate an integrated silicon photonic scheme to generate multi-channel millimeter-wave(MMW) signals for 5 G multi-user applications. The fabricated silicon photonic chip has a footprint of 1.1 × 2.1 mm^2 and integrates 7 independent channels each having on-chip polarization control and heterodyne mixing functions. 7 channels of4-Gb/s QPSK baseband signals are delivered via a 2-km multi-core fiber(MCF) and coupled into the chip with a local oscillator(LO) light. The polarization state of each signal light is automatically adjusted and aligned with that of the LO light, and then 7 channels of 28-GHz MMW carrying 4-Gb/s QPSK signals are generated by optical heterodyne beating. Automated polarizationcontrol function of each channel is also demonstrated with ~7-ms tuning time and ~27-dB extinction ratio. | Ruiyuan Cao Yu He Qingming Zhu Jingchi Li Shaohua An Yong Zhang Yikai Su | 2019 | Journal of Semiconductors2019，40，5： | 2 |
| 6 | Metamaterial-enabled arbitrary on-chip spatial mode manipulation显示文摘On-chip spatial mode operation,represented as mode-division multiplexing(MDM),can support high-capacity data communications and promise superior performance in various systems and numerous applications from optical sensing to nonlinear and quantum optics.However,the scalability of state-of-the-art mode manipulation techniques is significantly hindered not only by the particular mode-order-oriented design strategy but also by the inherent limitations of possibly achievable mode orders.Recently,metamaterials capable of providing subwavelength-scale control of optical wavefronts have emerged as an attractive alternative to manipulate guided modes with compact footprints and broadband functionalities.Herein,we propose a universal yet efficient design framework based on the topological metamaterial building block(BB),enabling the excitation of arbitrary high-order spatial modes in silicon waveguides.By simply programming the layout of multiple fully etched dielectric metamaterial perturbations with predefined mathematical formulas,arbitrary high-order mode conversion and mode exchange can be simultaneously realized with uniform and competitive performance.The extraordinary scalability of the metamaterial BB frame is experimentally benchmarked by a record high-order mode operator up to the twentieth.As a proof of conceptual application,an 8-mode MDM data transmission of 28-GBaud 16-QAM optical signals is also verified with an aggregate data rate of 813 Gb/s(7%FEC).This user-friendly metamaterial BB concept marks a quintessential breakthrough for comprehensive manipulation of spatial light on-chip by breaking the long-standing shackles on the scalability,which may open up fascinating opportunities for complex photonic functionalities previously inaccessible. | Jinlong Xiang Zhiyuan Tao Xingfeng Li Yaotian Zhao Yu He Xuhan Guo Yikai Su | 2022 | Light(Science & Applications)2022，11，7： | 2 |
| 7 | Non-blocking 2×2 switching unit based on nested silicon microring resonators with high extinction ratios and low crosstalks显示文摘In this paper,we propose and demonstrate a2 9 2 optical Benes switching unit based on two nested silicon microring resonators(MRRs)monolithically integrated on a silicon-on-insulator(SOI)wafer.High extinction ratios(ERs)of about 44.7/38.0 dB and low crosstalk values of about-37.5/-45.2 dB at cross/bar states are obtained with the fabricated device.The operation principle is theoretically studied and the switching function is verified by system demonstration experiments with 10 and12.5 Gb/s non-return-to-zero(NRZ)signals.The switching speed on the order of gigahertz based on free carrier effect in silicon is also experimentally demonstrated. | Jiayang Wu Xinhong Jiang Ting Pan Pan Cao Liang Zhang Xiaofeng Hu Yikai Su | 2014 | Chinese Science Bulletin2014，59，22： | 2 |
| 8 | All-optical silicon microring spiking neuron显示文摘With the rapid development of artificial intelligence and machine learning, brain-inspired neuromorphic photonics has emerged as an extremely attractive computing paradigm, promising orders-of-magnitude higher computing speed and energy efficiency compared to its electronic counterparts. Tremendous efforts have been devoted to photonic hardware implementations of mimicking the nonlinear neuron-like spiking response and the linear synapse-like weighting functionality. Here, we systematically characterize the spiking dynamics of a passive silicon microring neuron. The research of self-pulsation and excitability reveals that the silicon microring can function as an all-optical class Ⅱ resonate-and-fire neuron. The typical refractory period has been successfully suppressed by configuring the pump power above the perturbation power, hence allowing the microring neuron to operate with a speed up to roughly sub-gigahertz. Additionally, temporal integration and controllable inhibition regimes are experimentally demonstrated for the first time, to the best of our knowledge. Our experimental verification is obtained with a commercial CMOS platform, hence offering great potential for large-scale neuromorphic photonics integration. | Jinlong Xiang Yujia Zhang Yaotian Zhao Xuhan Guo Yikai Su | 2022 | Photonics Research2022，10，4： | 2 |
| 9 | High-efficiency and broadband four-wave mixing in a silicon-graphene strip waveguide with a windowed silica top layer显示文摘We experimentally demonstrate high-efficiency and broadband four-wave mixing in a silicon-graphene strip waveguide. A four-wave mixing conversion efficiency of -38.7 d B and a 3-dB conversion bandwidth of 35 nm are achieved in the silicon-graphene strip waveguide with an optimized light-graphene interaction length of 60 μm. The interaction length is controlled by a windowed area of silica layer on the silicon waveguide.Numerical simulations and experimental studies are carried out and show a nonlinear parameter γGOSas large as 10~4 W^(-1)· m^(-1). | YUXING YANG ZHENZHEN XU XINHONG JIANG YU HE XUHAN GUO YONG ZHANG CIYUAN QIU YIKAI SU | 2018 | Photonics Research2018，6，10： | 2 |
| 10 | Genetic architecture of maize yield traits dissected by QTL mapping and GWAS in maize显示文摘The study of yield traits can reveal the genetic architecture of grain yield for improving maize production.In this study, an association panel comprising 362 inbred lines and a recombinant inbred line population derived from X178 × 9782 were used to identify candidate genes for nine yield traits. High-priority overlap(HPO) genes, which are genes prioritized in a genome-wide association study(GWAS), were investigated using coexpression networks. The GWAS identified 51 environmentally stable SNPs in two environments and 36 pleiotropic SNPs, including three SNPs with both attributes. Seven hotspots containing 41 trait-associated SNPs were identified on six chromosomes by permutation. Pyramiding of superior alleles showed a highly positive effect on all traits, and the phenotypic values of ear diameter and ear weight consistently corresponded with the number of superior alleles in tropical and temperate germplasm. A total of 61 HPO genes were detected after trait-associated SNPs were combined with the coexpression networks. Linkage mapping identified 16 environmentally stable and 16 pleiotropic QTL.Seven SNPs that were located in QTL intervals were assigned as consensus SNPs for the yield traits.Among the candidate genes predicted by our study, some genes were confirmed to function in seed development. The gene Zm00001 d016656 encoding a serine/threonine protein kinase was associated with five different traits across multiple environments. Some genes were uniquely expressed in specific tissues and at certain stages of seed development. These findings will provide genetic information and resources for molecular breeding of maize grain yield. | Xiao Zhang Zhiyong Ren Bowen Luo Haixu Zhong Peng Ma Hongkai Zhang Hongmei Hu Yikai Wang Haiying Zhang Dan Liu Ling Wu Zhi Nie Yonghui Zhu Wenzhu He Suzhi Zhang Shunzong Su Yaou Shen Shibin Gao | 2022 | The Crop Journal2022，10，2： | 2 |
| 11 | On-chip silicon polarization and mode handling devices显示文摘 | Yong ZHANG Yu HE Qingming ZHU Xinhong JIANG Xuhan Guo Ciyuan QIU Yikai SU | 2018 | Frontiers of Optoelectronics2018，11，1： | 1 |
| 12 | Compact on-chip 1×2 wavelength selective switch based on silicon microring resonator with nested pairs of subrings显示文摘We propose and experimentally demonstrate compact on-chip 1×2 wavelength selective switches(WSSs) based on silicon microring resonators(MRRs) with nested pairs of subrings(NPSs). Owing to the resonance splitting induced by the inner NPSs, the proposed devices are capable of performing selective channel routing at certain resonance wavelengths of the outer MRRs. System demonstration of dynamic channel routing using fabricated devices with one and two NPSs is carried out for 10 Gb∕s non-return-to-zero signal. The experimental results verify the effectiveness of the fabricated devices as compact on-chip WSSs. | Jiayang Wu Pan Cao Ting Pan Yuxing Yang Ciyuan Qiu Christine Tremblay Yikai Su | 2015 | Photonics Research2015，3，1： | 1 |
| 13 | Ultracompact bandwidth-tunable filter based on subwavelength grating-assisted contra-directional couplers显示文摘An ultracompact,bandwidth-tunable filter has been demonstrated using a silicon-on-insulator(SOI)wafer.The device is based on cascaded grating-assisted contra-directional couplers(GACDCs).It also involves the use of a subwavelength grating(SWG)structure.By heating one of the heaters on GACDCs,a bandwidth tunability of~6 nm is achieved.Owing to the benefit of having a large coupling coefficient between SWG and strip waveguides,the length of the coupling region is only 100 pm.Moreover,the combination of the curved SWG and the tapered strip waveguides effectively suppresses the sidelobes.The filter possesses features of simultaneous wavelength tuning with no free spectral range(FSR)limitation.A maximum bandwidth of 10 nm was experimentally measured with a high out-of-band contrast of 25 dB.Similarly,the minimum bandwidth recorded is 4 nm with an out-of-band contrast of 15 dB. | Kangnian WANG Yuan WANG Xuhan GUO Yong ZHANG An HE Yikai SU | 2021 | Frontiers of Optoelectronics2021，14，3： | 1 |
| 14 | Modeling of quasi-grating sidewall corrugation in SOI microring add-drop filters显示文摘 | Tao Wang Ziyang Zhang Fangfei Liu Ye Tong Jing Wang Yue Tian Min Qiu Yikai Su | 2009 | Optics Communications2009，，17： | 1 |
| 15 | Coupled mode theory analysis of mode-splitting in coupled cavity sys- tem显示文摘 | Li Qiang Wang Tao Su Yikai | 2010 | Opt Express2010，18，8： | 1 |
| 16 | Compact all-optical differential-equation solver based on silicon microring resonator显示文摘我们建议并且数字地表明 ultrafast 即时平常的微分方程(颂诗) 计算基于一个硅 microring 共鸣器在光地里联合起来,在象一个光时间的微分器的批评联合区域操作。作为一个信号处理系统的基本积木,一个消减器和 splitter 在建议结构被包括。这个计划在 silicon-on-insulator (SOI ) 上以高速度,紧缩的尺寸和集成被展示晶片。这个计算单位的尺寸仅仅是 35 m ???? 綔 ? 钋 ?? 亘 ? 疞? 鞬蒠鞪? 趬嶰? 椿 ???? m 吗?? | Liyang LU Jiayang WU Tao WANG Yikai SU | 2012 | Frontiers of Optoelectronics2012，5，1： | 1 |
| 17 | Demonstration and scalability analysis of all-optical virtual private network in multiple passive optical networks using ASK/ FSK format显示文摘 | Tian Yue Ye Tong Su Yikai | 2007 | IEEE Photon Technol Lett2007，19，20： | 1 |
| 18 | Ultracompact topological photonic switch based on valley-vortex-enhanced high-efficiency phases shift显示文摘Topologically protected edge states based on valley photonic crystals(VPCs)have been widely studied,from theoretical verifcation to technical applications.However,research on integrated tuneable topological devices is still lacking.Here,we study the phase-shifting theory of topological edge modes based on a VPC structure.Benefiting from the phase vortex formed by the VPC structure,the optical path of the topological edge mode in the propagation direction is approximately two-fold that of the conventional optical mode in a strip waveguide.In experiments,we show a 1.57-fold improvement inπ-phase tuning efficiency.By leveraging the highefficiency phase-shifting properties and the sharp-turn features of the topological waveguide,we demonstrate an ultracompact 1×2 thermo-optic topological switch(TOTS)operating at telecommunication wavelengths.A switching power of 18.2 mW is needed with an ultracompact device footprint of 25.66×28.3μm in the wavelength range of 1530-1582 nm.To the best of our knowledge,this topological photonic switch is the smallest switch of any dielectric or semiconductor 1×2/2×2 broadband optical switches,including thermo-optic and electro-optic switches.In addition,a high-speed transmission experiment employing the proposed TOTS is carried out to demonstrate the robust transmission of high-speed data.Our work reveals the phase shifting mechanism of valley edge modes,which may enable diverse topological functional devices in many fields,such as optical communications,nanophotonics,and quantum information processing. | Hongwei Wang Gujing Tang Yu He Zhen Wang Xingfeng Li Lu Sun Yong Zhang Luqi Yuan Jianwen Dong Yikai Su | 2022 | Light(Science & Applications)2022，11，11： | 1 |
| 19 | A WDM passive optical net- work enabling multicasting with color-free ONUs显示文摘 | TIAN Yue CHANG Qingjiang SU Yikai | 2008 | Optics Express2008，16，10： | 1 |
| 20 | Wide dynamic range 10Gb/s DPSK packet receiver using optical limiting amplifiers 显示文摘 | Yikai Su | 2004 | IEEE Photonics Technology Letters2004，16，1： | 1 |
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