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An adjustment-free laser resonator based on micron-scale corner cube array

Chinese Physics B 2025年第3期34卷 382-387页

作者： Pengyuan Chang Xinrong Huang Caolei Fu Aiping Liu Duo Pan Zhiyang Wang Jingbiao Chen Institute of Quantum Information and Technology Nanjing University of Posts and TelecommunicationsNanjing 210003China State Key Laboratory of Advanced Optical Communication Systems and Networks Institute of Quantum ElectronicsSchool of ElectronicsPeking UniversityBeijing 100087China Hefei National Laboratory Hefei 230088China

The topic of improving the mechanical stability of external cavity diode lasers(ECDLs)has recently attracted widespread attention and *** use of corner-cube-array(CCA)-based resonators provides a potential solution for this purpose,although continuous oscillation at super large incident angle remains *** this work,we employ the CCA resonator to generate continuous oscillation within±20°angular misalignment of cavity mirror in *** the basis of retroreflection theory,the retroreflectivity of a CCA is analyzed by using optical simulation ***,the experiment verifies the advantage of using a CCA over a plane mirror in laser resonator,thereby providing a promising approach for *** threshold characteristic curves measured at different incident angles in the experiment verify that the CCA possesses an obvious anti-angle misalignment *** research introduces an alternative solution of using CCA resonator instead of parallel plane cavity,thereby realizing an adjustment-free ECDL with enhanced mechanical stability.

关键词： laser resonant cavity corner cube array external cavity diode laser threshold curve

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Non-Ambiguous Microwave Frequency Measurement based on Triple Electro-Optic Frequency Comb

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IEEE Photonics Technology Letters 2025年第14期37卷 749-752页

作者： Yuan, Zhengchao Fan, Xinyu Sun, Peiyuan Wan, Yangyang Xu, Bingxin He, Zuyuan Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai200240 China Max-Planck Institute of Quantum Optics Hans-Kopfermann-Straβe 1 Garching85748 Germany

optical frequency comb serves as precise rulers in physical quantity measurements, using the Vernier measurement principle by configuring a multi-comb system. We propose a non-ambiguous microwave frequency measurement system based on triple comb generated by electro-optic modulation. The triple combs with slightly different repetition rates sample the unknown microwave signal. Utilizing mathematical principles of non-ambiguous measurement, the system achieves high-precision static signal measurements and real-time dynamic signal tracking. Limited by the modulation bandwidth of modulator, the system attains a detection range from 0 to 30 GHz. Leveraging the electro-optic comb’s flexibility, optical comb repetition rates can be tailored to receiver bandwidths. The dynamic range of microwave signal power is from -30 dBm to -10 dBm. In instantaneous frequency measurement of dynamic signal, errorfree measurement can be achieved at a resolution of 1 MHz. The spectral stability of the triple combs based on electro-optic modulation is not affected by temperature and vibration, which ensures that the microwave frequency measurement has a high robustness in a variety of measurement environments. © 1989-2012 IEEE.

关键词： Microwave measurement

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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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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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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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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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Direct detection with an optimal transfer function:toward the electrical spectral efficiency of coherent homodyne detection

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Opto-Electronic Science 2025年第2期4卷 1-15页

作者： Xingfeng Li Jingchi Li Xiong Ni Hudi Liu Qunbi Zhuge Haoshuo Chen William Shieh Yikai Su State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China Nokia Bell Labs 600 Mountain AveMurray HillNJ 07974USA School of Engineering Westlake UniversityHangzhou 310030China

Complex-valued double-sideband direct detection(DD)can reconstruct the optical field and achieve a high electrical spectral efficiency(ESE)comparable to that of a coherent homodyne receiver,and DD does not require a costly local oscillator ***,a fundamental question remains if there is an optimal DD receiver structure with the simplest design to approach the performance of the coherent homodyne *** study derives the optimal DD receiver structure with an optimal transfer function to recover a quadrature amplitude modulation(QAM)signal with a near-zero guard band at the central frequency of the *** derive the theoretical ESE limit for various detection schemes by invoking Shannon’s *** proposed scheme is closest to coherent homodyne detection in terms of the theoretical ESE *** leveraging a WaveShaper to construct the optimal transfer function,we conduct a proof-of-concept experiment to transmit a net 228.85-Gb/s 64-QAM signal over an 80-km single-mode fiber with a net ESE of 8.76 b/s/*** the best of our knowledge,this study reports the highest net ESE per polarization per wavelength for DD transmission beyond 40-km single-mode *** a comprehensive metric,denoted as 2ESE×Reach,we achieve the highest 2ESE×Reach per polarization per wavelength for DD transmission.

关键词： optical communication direct detection optical field recovery electrical spectral efficiency

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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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Self-Correcting Beam Training Scheme for Metasurface Enabled XL-MIMO with Hardware Limitations

Self-Correcting Beam Training Scheme for Metasurface Enabled...

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IEEE Conference on Wireless communications and Networking

作者： Zhihan Chen Shupei Zhang Shaohua Yue Boya Di State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing China

ISBN: (数字)9798350368369

ISBN: (纸本)9798350368376

Reconfigurable intelligent surfaces (RISs) are considered as an efficient solution for the implementation of extremely large-scale MIMO (XL-MIMO). To mitigate the complexity of channel information acquisition, beam training is identified as an effective solution by selecting the optimal beam from a predefined codebook. However, practical hardware limitations of RIS result in the overlap of codeword coverage, i.e., non-orthogonal beams, which degrades the accuracy of optimal beam selection. In this paper, we propose a self-correcting hierarchical beam training scheme, where beam training is designed as a sequential process based on a tailored long short-term memory network. Received powers of sequentially selected multi-layer codewords are integrated to construct quasi-orthogonality for optimizing the beam selection. Beam training is thus reformulated as a sequential codeword classification problem. A codeword priority adjustment procedure is then designed to prevent the beam selection from looping among layers according to the visit frequency to each codeword of the current selection path. Simulation results show that our proposed method outperforms existing beam training approaches in terms of beam selection accuracy and sum rate in the presence of hardware limitations.

关键词： Training Deep learning Accuracy communication systems Simulation Reconfigurable intelligent surfaces Metasurfaces Hardware Complexity theory Long short term memory

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