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Accelerating the Thermal Response of a III-V/Si3N4 Hybrid External Cavity Laser with Electronic-Photonic Co-Design

Journal of Lightwave Technology 2025年第10期43卷 4871-4880页

作者： Han, keyi Lu, Liangjun Guo, Yuyao Li, Xinhang Xu, Weihan Chen, Jianpin Zhou, Linjie Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication Systems and Networks The Shanghai Institute for Advanced Communication and Data Science Shanghai Key Lab of Navigation and Location Services Department of Electronic Engineering Shanghai200240 China SJTU-Pinghu Institute of Intelligent Optoelectronics Pinghu314200 China

We propose an electronic-photonic (EP) co-designed scheme to enhance the modulation speed of thermo-optic (TO) phase shifters. We establish a small signal analysis model to optimize the TO phase shifter by compensating its thermal-response-limited low-pass behavior with an electric high-pass equalization circuit, thus expanding the modulation bandwidth. To prove its potential, we demonstrate an EP-converged frequency-modulated continuous-wave (FMCW) laser comprising an InP/Si3N4 hybrid integrated external cavity laser (ECL) driving with an electric equalization circuit. The small signal bandwidth of the TO phase shifter inside the laser cavity is enhanced from 10 kHz to 360 kHz with the equalization circuit. By driving the TO phase shifter, we generate an FMCW signal with a chirp bandwidth of 943 MHz at a repetition rate of 100 kHz. The residual nonlinearity of the frequency chirp is reduced to 0.72% thanks to the pre-distortion technique, enabling a ranging precision of 8.1 cm over a 20 m distance. © 2025 IEEE.

关键词： Pulse repetition rate

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Imaging through Scattering Media via Optronic Convolutional Neural Network 4

Imaging through Scattering Media via Optronic Convolutional ...

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4th International Computational Imaging Conference, CITA 2024

作者： Tu, Luofei Huang, Zicheng Ma, Jiahui Guo, Zhishun Gao, Yesheng State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University 800 Dongchuan Road Shanghai200240 China

ISBN: (纸本)9781510688834

With the growing influence of machine learning, it brings benefits to the inverse problem of imaging through scattering media in computational imaging. This study introduces an innovative opto-electronic fully convolutional neural network (OP-FCNN) designed to enhance speckle reconstruction with reduced computational complexity. By integrating lens groups and spatial light modulators, the OP-FCNN performs essential functions like convolution and sampling in the optical domain, drastically lowering the computational demands compared to traditional digital methods. This approach not only improves imaging performance but also offers scalability and adaptability for various datasets. The findings indicate that the OP-FCNN represents a promising advancement toward efficient all-optical imaging systems through scattering media. © 2025 SPIE.

关键词： Imaging systems

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Silicon 3D-integrated 2 × 2 × 106.25 Gbps parallel multimode transmitter

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Optics Letters 2025年第9期50卷 2888-2891页

作者： Ran, Shihuan Sun, Yao Miao, Ting Chu, Bohan Li, Yu Chen, Jianping Zhou, Linjie State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China SJTU-Pinghu Institute of Intelligent Optoelectronics Pinghu314200 China

Mode division multiplexing (MDM) has garnered significant attention for its potential to enhance communication capacity. In this paper, we present for the first time, to the best of our knowledge, a 3D-integrated parallel multimode transmitter, featuring two multimode fibers, with both TE0 and TE1 modes transmitted for data multiplexing. Each channel exhibits an electro-optic (EO) bandwidth of ∼45 GHz, enabling a total transmission of 2 × 2 × 106.25 Gbps upon four-level pulse amplitude modulation (PAM-4). © 2025 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.

关键词： Bandwidth

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Electromagnetic metamaterial agent

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Light(Science & Applications) 2025年第1期14卷 118-130页

作者： Shengguo Hu Mingyi Li Jiawen Xu Hongrui Zhang Shanghang Zhang Tie Jun Cui Philipp del Hougne Lianlin Li State Key Laboratory of Advanced Optical Communication Systems and Networks School of ElectronicsPeking UniversityBeijing100871China National Key Laboratory for Multimedia Information Processing School of Computer SciencePeking UniversityBeijing100871China State Key Laboratory of Millimeter Waves Southeast UniversityNanjing210096China Pazhou Laboratory(Huangpu) GuangzhouGuangdong510555China Univ Rennes CNRSIETR-UMR 6164F-35000RennesFrance

Metamaterials have revolutionized wave control;in the last two decades,they evolved from passive devices via programmable devices to sensor-endowed self-adaptive devices realizing a user-specified *** deep-learning techniques play an increasingly important role in metamaterial inverse design,measurement post-processing and end-to-end optimization,their role is ultimately still limited to approximating specific mathematical relations;the metamaterial is still limited to serving as proxy of a human operator,realizing a predefined ***,we propose and experimentally prototype a paradigm shift toward a metamaterial agent(coined metaAgent)endowed with reasoning and cognitive capabilities enabling the autonomous planning and successful execution of diverse long-horizon tasks,including electromagnetic(EM)field manipulations and interactions with robots and *** recently released foundation models,metaAgent reasons in high-level natural language,acting upon diverse prompts from an evolving complex ***,metaAgent's cerebrum performs high-level task planning in natural language via a multi-agent discussion mechanism,where agents are domain experts in sensing,planning,grounding,and *** response to live environmental feedback within a real-world setting emulating an ambient-assisted living context(including human requests in natural language),our metaAgent prototype self-organizes a hierarchy of EM manipulation tasks in conjunction with commanding a *** masters foundational EM manipulation skills related to wireless communications and sensing,and it memorizes and learns from past experience based on human feedback.

关键词： agent prompt reasoning

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Integrated spatial photonic XY Ising sampler based on a high-uniformity 1 × 8 multi-mode interferometer

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Photonics Research 2025年第5期13卷 1419-1427页

作者： Ye, Xin Zhang, Wenjia He, Zuyuan State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai200240 China

Spatial photonic Ising machines, as emerging artificial intelligence hardware solutions by leveraging unique physical phenomena, have shown promising results in solving large-scale combinatorial problems. However, spatial light modulator enabled Ising machines still remain bulky, are very power demanding, and have poor stability. In this study, we propose an integrated XY Ising sampler based on a highly uniform multimode interferometer and a phase shifter array, enabling the minimization of both discrete and continuous spin Hamiltonians. We elucidate the performance of this computing platform in achieving fully programmable spin couplings and external magnetic fields. Additionally, we successfully demonstrate the weighted full-rank Ising model with a linear dependence of 0.82 and weighted MaxCut problem solving with the proposed sampler. Our results illustrate that the developed structure has significant potential for larger-scale, reduced power consumption and increased operational speed, positioning it as a versatile platform for commercially viable high-performance samplers of combinatorial optimization problems. © 2025 Chinese Laser Press.

关键词： Ising model

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Performance assessment of octagonal layout based integrated photonic reservoir computing for optical channel equalization

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Optics Express 2025年第7期33卷 15814-15826页

作者： Zuo, Xiaoyan Pei, Li Bai, Bing Bai, Bowen Hu, Zhouyi Wang, Jianshuai Qu, Qi Dong, Fei Institute of Lightwave Technology Beijing Jiaotong University Ministry of Education Key Laboratory of All-Optical Networks and Modern Communication Networks Beijing100044 China Technology Co. Ltd. China State Key Laboratory of Advanced Optical Communications System and Networks School of Electronics Peking University Beijing100871 China Beijing Aerospace Institute for Metrology and Measurement Technology Beijing100076 China

Compared to electronic equalizers, the equalizers based on integrated photonic reservoir computing exhibit the advantages of large bandwidth, short latency, and low power consumption. The existing rectangular reservoir layout employs internal nodes as input and output nodes, leading to inadequate signal exchange and extra noise due to waveguide crossing. We proposed an optical channel equalizer based on an octagonal reservoir layout and verified its equalization ability. The system-level simulation of the proposed layout is conducted to investigate the impact of layout shape, node quantity, input and output port number, and weight algorithm on channel equalization performance in a 25Gbaud 4-level pulse amplitude modulation optical communication system. Results indicate that, within a transmission distance of 5-30 km, the bit error rate (BER) of the equalized signal in the proposed octagonal layout is lower than that of a rectangular layout with the same number of nodes. Specifically, at 5 km, the octagonal layout’s BER is 5 and 10 orders of magnitude lower than the rectangular layout and the feedforward equalizer, respectively. Meanwhile, the best readout algorithm, K-nearest neighbor regression, achieves an equalized BER of 7.012 × 10−14 © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Pulse amplitude modulation

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Simultaneous quantum and classical communication protocol via orthogonal polarization multiplexing 4

Simultaneous quantum and classical communication protocol vi...

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4th International Computational Imaging Conference, CITA 2024

作者： Tan, Zicong Tan, Piao Wang, Tao Zeng, Guihua State Key Laboratory of Advanced Optical Communication Systems and Networks Center of Quantum Sensing and Information Processing Shanghai Jiao Tong University Shanghai200240 China Hefei National Laboratory Hefei230088 China

ISBN: (纸本)9781510688834

Classical communication and quantum key distribution (QKD) share similarities in signal modulation, transmission, and reception, providing a foundation for their integration. This paper proposes a novel protocol for simultaneous quantum and classical communication in short-distance Continuous-Variable QKD (CV-QKD). The protocol employs polarization-state encoding of classical information with weak coherent states, allowing for the concurrent transmission of quantum and classical data without the need for classical optical pulses. A noise model is established to analyze the system's excess noise under varying modulation variances, along with the performance of both classical and quantum communication. Simulation results indicate that our proposed protocol can achieve a secure key rate of no less than 1.05 Mbps over a distance of 20 km. © 2025 SPIE.

关键词： Quantum communication

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Single-atomic-ensemble dual-wavelength optical frequency standard

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Photonics Research 2025年第3期13卷 721-727页

作者： JIE MIAO JINGMING CHEN DESHUI YU QIAOHUI YANG DUO PAN JINGBIAO CHEN State Key Laboratory of Advanced Optical Communication Systems and Networks Institute of Quantum ElectronicsSchool of ElectronicsPeking University National Time Service Center Chinese Academy of Sciences Hefei National Laboratory

We demonstrate a dual-wavelength optical frequency standard based on the dual-optical-transition modulation transfer spectroscopy (DOT-MTS) between different quantum transitions of the rubidium D1 (795 nm) and D2(780 nm) lines. In a single rubidium atomic ensemble, modulation frequency sidebands from the 780 nm pump beam are simultaneously transferred to both the 780 and 795 nm probe lasers. The DOT-MTS enables the simultaneous stabilization of 780 and 795 nm lasers on a single vapor cell. Both lasers exhibit a frequency instability in the low 10-14range at 1 s of averaging, as estimated from the residual error signal. A theoretical model is developed based on the V-type atomic level structure to illustrate the dual-wavelength spectroscopy. This approach can be extended to develop a multi-wavelength optical frequency standard within a single atomic ensemble, broadening its applicability in fields such as precision metrology, Rydberg atoms, wavelength standards,optical networks, and beyond.

关键词： Frequency modulation Laser beams Modulation spectroscopy optical clocks optical networks Tunable diode lasers

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Observing non-Hermiticity induced chirality breaking in a synthetic Hall ladder

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Light(Science & Applications) 2025年第1期14卷 280-290页

作者： Rui Ye Yanyan He Guangzhen Li Luojia Wang Xiaoxiong Wu Xin Qiao Yuanlin Zheng Liang Jin Da-Wei Wang Luqi Yuan Xianfeng Chen State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai200240China School of Physics Nankai UniversityTianjin300071China Zhejiang Key Laboratory of Micro-Nano Quantum Chips and Quantum Control School of Physicsand State Key Laboratory for Extreme Photonics and InstrumentationZhejiang UniversityHangzhou310027China Shanghai Research Center for Quantum Sciences Shanghai201315China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal UniversityJinan250358China

Non-Hermitian topological photonics plays a key role in bridging topological matter with gain and loss engineering in *** we report the experimental observation of the break of chiral currents in a Hall ladder from the non-Hermiticity by constructing synthetic frequency dimension in two rings,where currents on both legs of the ladder co-propagate in the same *** origin of such phenomena is resulted from the interplay between the effective magnetic flux and the on-site gain and *** non-Hermitian co-propagating currents exhibit characteristics of unidirectional frequency conversion in both rings,and moreover,different from the counterpart in Hermitian systems,can provide a method to probe the signatures of the non-Hermitian skin effect from steady-state bulk *** model is further extended to models including next-nearest-neighbor couplings,pointing to a way for observing the non-Hermitian signature with higher winding number,and provides a new control knob for light manipulation with the topological dissipation engineering.

关键词： ladder topological signature

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Waveguide superlattices with artificial gauge field toward colorless and low-crosstalk ultrahigh-density photonic integration

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advanced Photonics 2025年第1期7卷 14-22页

作者： Xuelin Zhang Jiangbing Du Ke Xu Zuyuan He Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication Systems and NetworksShanghaiChina Harbin Institute of Technology(Shenzhen) Department of Electronic and Information EngineeringShenzhenChina

Dense waveguides are the basic building blocks for photonic integrated circuits(PICs).Due to the rapidly increasing scale of PIC chips,high-density integration of waveguide arrays working with low crosstalk over broadband wavelength range is highly ***,the subwavelength regime of such structures has not been adequately explored in *** propose a waveguide superlattice design leveraging the artificial gauge field mechanism,corresponding to the quantum analog of field-induced n-"photon"resonances in semiconductor *** approach experimentally achieves-24 dB crosstalk suppression with an ultrabroad transmission bandwidth more than 500 nm for dual polarizations on the Si_3N_4 *** fabricated waveguide superlattices support high-speed signal transmission of 112 Gbit/s with high-fidelity signal-to-noise ratio profiles and bit error *** design,featuring a silica upper cladding,is compatible with standard metal back-end-of-the-line *** on such a fundamental structure,which is readily transferable to other platforms,passive and active devices over versatile platforms can be realized with a significantly shrunk on-chip footprint,thus it holds great promise for significant reduction of the power consumption and cost in PICs.

关键词： silicon nitride waveguides waveguide superlattice artificial gauge field

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