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2023 Opto-Electronics and Communications Conference, OECC 2023

作者： Cao, Xianyi Long, Jiaxuan Wu, Kan Li, Tianyi Chen, Jianping Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai China

A non-coaxial Lidar system based on lens-assisted beam-steering technology is demonstrated. A coherent random amplitude modulated continuous wave detection method is applied in the Lidar system to enable the capabilit... 详细信息

ISBN: (纸本)9781665462136

关键词： optical radar

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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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A Kind of Low-modal-crosstalk Mode DEMUX for Stable DSP-free IM/DD MDM Transmission

A Kind of Low-modal-crosstalk Mode DEMUX for Stable DSP-free...

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2023 optical Fiber Communications Conference and Exhibition, OFC 2023

作者： Cui, Jian Gao, Yuyang Huang, Shuailuo Yu, Jinyi Shen, Lei Zhang, Lei Yan, Changkun Yang, Liubo Wang, Ruichun He, Yongqi Chen, Zhangyuan Li, Juhao Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks Beijing100871 China YOFC State Key Laboratory of Optical Fiber and Cable Manufacture Technology Wuhan430073 China Peng Cheng Laboratory Shenzhen518055 China

A low-modal-crosstalk 4-LP-mode demultiplexer with orthogonal combiner for degenerate mode reception is designed and fabricated by side-polishing processing, based on which DSP-free IM/DD MDM-WDM transmission over 20-... 详细信息

ISBN: (纸本)9781957171180

关键词： Crosstalk

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A Frequency Shifting Scheme for On-chip optical Frequency Transfer

A Frequency Shifting Scheme for On-chip Optical Frequency Tr...

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2023 Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium, EFTF/IFCS 2023

作者： Qiu, Ziang Hu, Liang Chen, Jianping Wu, Guiling Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication System and Networks Department of Electronic Engineering Shanghai China Shanghai Jiao Tong University Shanghai Key Laboratory of Navigation and Location Based Services Shanghai China

ISBN: (纸本)9798350311426

We report a frequency shifting scheme for on-chip optical frequency transfer with low external circuit requirements. Serrodyne modulation method is used to achieve frequency shifting with high carrier and sideband suppression ratios for optical carriers, and the method is also suitable for a wide range of integrated platforms. We first demonstrate the feasibility of the scheme using a commercial phase modulator, which is able to produce a frequency shift of over 1 MHz, a carrier suppression ratio of over 50 dB, a sideband suppression ratio of over 37 dB and a conversion loss of about 0.08 dB. We also design a phase modulator on thin film lithium niobate platform with a low half wave voltage about 2.18 V, which greatly reduces the requirements of the external circuit voltage for frequency shifting, and can achieve a frequency shift above 1 GHz. Our proposed scheme verifies the feasibility of on-chip frequency shifting with low loss and high suppression ratio, and paves the way for the integration of optical frequency transfer systems. © 2023 IEEE.

关键词： frequency shifting optical frequency transfer phase modulator serrodyne modulatio thin film lithium niobate

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Improve the performance of interferometer with ultra-cold atoms

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Chinese Physics B 2021年第1期30卷 42-55页

作者： Xiangyu Dong Shengjie Jin Hongmian Shui Peng Peng Xiaoji Zhou State Key Laboratory of Advanced Optical Communication Systems and Networks Department of ElectronicsPeking UniversityBeijing 100871China

Ultra-cold atoms provide ideal platforms for *** macroscopic matter-wave property of ultra-cold atoms leads to large coherent length and long coherent time,which enable high accuracy and sensitivity to ***,we review our efforts to improve the performance of the *** demonstrate a shortcut method for manipulating ultra-cold atoms in an optical *** with traditional ones,this shortcut method can reduce the manipulation time by up to three orders of *** construct a matter-wave Ramsey interferometer for trapped motional quantum states and significantly increase its coherence time by one order of magnitude with an echo technique based on this *** have also been made to enhance the resolution by multimode *** of a noise-resilient multi-component interferometer shows that increasing the number of paths could sharpen the peaks in the time-domain interference fringes,which leads to a resolution nearly twice compared with that of a conventional double-path two-mode *** the shortcut method mentioned above,improvement of the momentum resolution could also be fulfilled,which leads to atomic momentum patterns less than 0.6hkL. To identify and remove systematic noises,we introduce the methods based on the principal component analysis (PCA) that reduce the noise in detection close to the 1/√2 of the photon-shot noise and separate and identify or even eliminate ***,we give a proposal to measure precisely the local gravity acceleration within a few centimeters based on our study of ultracold atoms in precision measurements.

关键词： precision measurement ultra-cold atoms atom interferometer gravity measurements

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Accurate and broadband manipulations of harmonic amplitudes and phases to reach 256 QAM millimeter-wave wireless communications by time-domain digital coding metasurface

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National Science Review 2022年第1期9卷 36-46页

作者： Ming Zheng Chen Wankai Tang Jun Yan Dai Jun Chen Ke Lei Zhang Cheng Zhang Jin Yang Lianlin Li Qiang Cheng Shi Jin Tie Jun Cui Institute of Electromagnetic Space Southeast University State Key Laboratory of Terahertz and Millimeter Waves City University of Hong Kong State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronics Peking University National Mobile Communications Research Laboratory Southeast University State Key Laboratory of Millimeter Waves Southeast University Center of Intelligent Metamaterials Pazhou Laboratory

We propose a theoretical mechanism and new coding strategy to realize extremely accurate manipulations of nonlinear electromagnetic harmonics in ultrawide frequency band based on a time-domain digital coding metasurface(TDCM).Using the proposed mechanism and coding strategy,we design and fabricate a millimeter-wave(mmWave) TDCM,which is composed of reprogrammable meta-atoms embedded with positive-intrinsic-negative *** controlling the duty ratios and time delays of the digital coding sequences loaded on a TDCM,experimental results show that both amplitudes and phases of different harmonics can be engineered at will simultaneously and precisely in broad frequency band from 22 to33 GHz,even when the coding states are imperfect,which is in good agreement with theoretical *** on the fabricated high-performance TDCM,we further propose and experimentally realize a large-capacity mmWave wireless communication system,where 256 quadrature amplitude modulation,along with other schemes,is *** new wireless communication system has a much simpler architecture than the currently used mmWave wireless systems,and hence can significantly reduce the hardware *** believe that the proposed method and system architecture can find vast application in future mmWave and terahertz-wave wireless communication and radar systems.

关键词： metasurface time-domain digital coding accurate and broadband harmonic control 256 QAM millimeter-wave wireless communications

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Cloaking in Periodic Epsilon-Near-Zero Waveguide with Smith-Purcell Radiation

Cloaking in Periodic Epsilon-Near-Zero Waveguide with Smith-...

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2024 Cross Strait Radio Science and Wireless Technology Conference, CSRSWTC 2024

作者： Lei, Yu-Lu Yang, Ji-Tao Du, Chao-Hai School of Electronics Peking University Center for Carbon-based Electronics China School of Electronics Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks China

ISBN: (纸本)9798331507794

The challenge of engineering and manipulating the electromagnetic (EM) properties of materials has long been a central focus in materials science and engineering. Among various strategies, materials with near-zero refractive indices have garnered significant interest due to their diverse applications in controlling EM waves. However, few studies have examined the effects of periodic arrangements on these materials. This study investigates the integration of photonic doping within a periodic epsilon-near-zero (ENZ) waveguide to elucidate the unique properties of Smith-Purcell radiation (SPR) at 5.8 GHz. By employing a structure with a relative permittivity of 37, we achieve uniform input signal phases across the ENZ medium and realize cloaking. Our findings reveal a coherent phase relationship between incident and output waves, paving the way for potential cloaking applications that prioritize fabrication simplicity and cost-effectiveness, even in hard-to-reach regimes. This research not only enhances our understanding of periodic ENZ structures but also opens new avenues for innovative applications in electromagnetic wave manipulation. © 2024 IEEE.

关键词： Refractive index

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Efficient FPGA Implementation of Syndrome-Assisted Layered Belief Propagation Decoder for CV-QKD systems 9

Efficient FPGA Implementation of Syndrome-Assisted Layered B...

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9th International Conference on Communication, Image and Signal Processing, CCISP 2024

作者： Chen, Yong Jiang, Xue-Qin Chen, Genlong Huang, Peng Bai, Enjian Hai, Han School of Information Science and Technology Donghua University Shanghai China Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai China

ISBN: (纸本)9798350356656

In this paper, we propose a QC-LDPC decoder architecture with low complexity as well as excellent decoding performance in CV-QKD systems, which employs the syndrome-assisted layered belief propagation decoding algorithm. To minimize the complexity of hardware implementation and resource consumption in iterative decoding, we use fixed-point numbers instead of floating-point numbers to update node messages. Additionally, two-segment nonuniform lookup tables are employed to implement ψ(x) efficiently. Besides, the layered syndrome-assisted early termination (LS-ET) scheme is introduced, resulting in the reduction of the number of decoding iterations while maintaining superior frame error rate (FER) performance. The experimental results indicate that the QC-LDPC decoder implemented on an FPGA is capable of achieving throughput of 50.8 Mbps when the code length is 26112 and code rate is 22/68. © 2024 IEEE.

关键词： BP CV-QKD FPGA QC-LDPC syndrome

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Generation of polarization-multiplexed terahertz orbital angular momentum combs via all-silicon metasurfaces

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Light(advanced Manufacturing) 2024年第3期5卷 120-129页

作者： Ming-Zhe Chong Yiwen Zhou Zong-Kun Zhang Jin Zhao Yue-Yi Zhang Chong-Qi Zhang Xiaofei Zang Chao-Hai Du Pu-Kun Liu Ming-Yao Xia School of Electronics Peking UniversityBeijing 100871China Terahertz Technology Innovation Research Institute and Shanghai Key Lab of Modern Optical SystemUniversity of Shanghai for Science and TechnologyNo.516 Jun Gong RoadShanghai 200093China State Key Laboratory of Advanced Optical Communication Systems and Networks School of ElectronicsPeking UniversityBeijing 100871China

Electromagnetic waves carrying orbital angular momentum(OAM),namely OAM beams,are important in various fields including optics,communications,and quantum ***,most current schemes can only generate single or several simple OAM ***-mode OAM beams are rarely *** paper proposes a scheme to design metasurfaces that can generate multiple polarization-multiplexed OAM modes with equal intervals and intensities(i.e.,OAM combs)working in the terahertz(THz)*** a proof of concept,we first design a metasurface to generate a pair of polarization-multiplexed OAM combs with arbitrary mode ***,another metasurface is proposed to realize a pair of polarization-multiplexed OAM combs with arbitrary locations and intervals in the OAM *** results agree well with full-wave simulations,verifying a great performance of OAM combs *** method may provide a new solution to designing high-capacity THz devices used in multi-mode communication systems.

关键词： Metasurfaces Terahertz Orbital angular momentum comb Polarization multiplexing

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Polarization-Insensitive optical Switch Fabrics and the key Components on the 220-nm SOI Platform

Polarization-Insensitive Optical Switch Fabrics and the Key ...

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2024 Asia Communications and Photonics Conference, ACP 2024 and International Conference on Information Photonics and optical Communications, IPOC 2024

作者： Gao, Wei Lu, Liangjun Su, Jinwei Li, Xin Chen, Jianping Zhou, Linjie State Key Laboratory of-Advanced Optical Communication-Systems and Networks Shanghai Jiao Tong University Shanghai China SJTU-Pinghu Institute of Intelligent-Optoelectronics Zhejiang Pinghu China

We propose innovative polarization-insensitive optical switch fabrics on the 220-nm SOI platform, featuring polarization-insensitive switch elements, polarization-insensitive waveguide crossings, and TE0-TM0 mode exch... 详细信息

ISBN: (纸本)9798350379266

关键词： Thulium alloys

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