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arXiv 2024年

作者： Chen, Ziyang Yu, Dongrui Lu, Ganbin Zhang, Yufei Yu, Song Luo, Bin Guo, Hong State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Center for Quantum Information Technology Peking University Beijing100871 China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing100876 China

The large-scale clock network is the key ingredient to obtain high precision in many scenarios, from fundamental research to cutting-edge applications. The advantage of the time synchronization among microwave clocks is their cost, size, and accessibility. Here, we demonstrate a femtosecond-level time synchronization of microwave clocks through a commercial link of 205.86 km via dual-comb-enhanced optical two-way time transfer, which achieves a 6.23-fs residual time deviation between synchronized timescales at 1 s and an instability below 6 × 10−18 at 10,000 s. Further, the high-precision time synchronization of microwave clocks significantly enhances the probe ability of subtle reciprocity changes of fiber to the sub-picosecond level. This work provides a path toward secure fiber time-frequency networks to support future microwave-clock-based precise timing and sensing systems. © 2024, CC BY.

关键词： Fiber to the x

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Inline-Amplification-Free Time Transfer Utilizing Waveform-Resolved Single-Photon Detection

arXiv

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arXiv 2024年

作者： Zhang, Yufei Chen, Ziyang Luo, Bin Guo, Hong State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Center for Quantum Information Technology Peking University Beijing100871 China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing100876 China

High-precision time transfer over a long haul of fiber plays a significant role in many fields. The core method, namely cascading relay nodes for the compensation of signal attenuation and dispersion, is however insufficient to deal with crucial point-to-point transfer scenarios, such as harsh environments with extremely deficient infrastructure and emergency conditions. In long-distance signal transmission without any inline amplifiers, the high loss of the optical fiber link becomes the primary limiting factor, and direct use of traditional photodetectors at the receiving end will bring about a significant drop in the stability of detected signals. Here we propose a waveform-resolved single photon detection technique and experimentally perform tomography on the weak transferred signal with an average photon number of just 0.617 per pulse. By adopting this technique, we achieve the time deviation of 95.68 ps and 192.58 ps at 200 km and 300 km respectively at an averaging time of 1 s, overcoming the technical lower bound induced by traditional photodetectors. This work lays the foundation for through-type time transfer with high precision in those significant inline-amplification-free scenarios. © 2024, CC BY.

关键词： Photodetectors

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Eliminating Correlation on a Continuous Variable Source Independent Quantum Random Number Generator with Finite Bandwidth

Eliminating Correlation on a Continuous Variable Source Inde...

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Asia communications and Photonics Conference and Exhibition (ACP)

作者： Han Zhou Xiangyu Wang Ziyang Chen Song Yu State Key Laboratory of Information Photonics and Optical Communications School of Electronic Engineering Beijing University of Posts and Telecommunications Beijing China State Key Laboratory of Advanced Optical Communication Systems and Networks and School of Electronics and Center for Quantum Information Peking University Beijing China

This paper proposes a security protocol based on continuous-variable source-independent quantum random number generator, which analyzes the data correlations caused by the finite bandwidth of the detector.

ISBN: (数字)9798350379266

ISBN: (纸本)9798350379273

关键词： Correlation Protocols Asia Bandwidth Detectors Generators optical fiber communication Security Photonics Quantum communication

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Single-end hybrid Rayleigh Brillouin and Raman distributed fibre-optic sensing system

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Light(advanced Manufacturing) 2023年第3期4卷 171-180页

作者： Linjing Huang Xinyu Fan Haijun He Lianshan Yan Zuyuan He State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic EngineeringShanghai Jiao Tong University800 Dongchuan RoadShanghai 200240China Center for Information Photonics&Communications School of Information Science and TechnologySouthwest Jiaotong UniversityChengduSichuan 611756China Peng Cheng Laboratory ShenzhenGuangdong 518055China

Backscattered lightwaves from an optical fibre are used to realise distributed fibre optic sensing(DFOS)systems for measuring various ***,Brillouin,and Raman backscattering provide different sensitivities to different measurands and have garnered the attention of researchers.A system combining the three principles above can effectively separate the measured strain and temperature completely as well as provide measurements of both dynamic and static ***,the combined system is extremely complicated if the three systems are independent of each ***,we propose a single-end hybrid DFOS system that uses two successive pulses to realise the Brillouin amplification of Rayleigh backscattering lightwaves for combining Rayleigh and Brillouin systems.A 3-bit pulse-coding method is employed to demodulate the Raman scattering of the two pulses to integrate Raman optical time-domain reflectometry into the hybrid *** this hybrid scheme,a simultaneous measurement of multiple parameters is realised,and a favourable measurement accuracy is achieved.

关键词： Rayleigh backscattering Brillouin backscattering Raman backscattering Distributed fiber-optic sensing system

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Sensitivity-tunable Glucose Sensor Based on Tilted Fiber Bragg Gratings

Sensitivity-tunable Glucose Sensor Based on Tilted Fiber Bra...

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2024 Photonics and Electromagnetics Research Symposium, PIERS 2024

作者： Dai, Ruichen Xu, Feng Cao, Jie Wang, Xin Ding, Mengjiao Zhao, Yunhe Shanghai Maritime University College of Information Engineering Shanghai201306 China Shanghai Maritime University Department of Physical Education Shanghai201306 China Shanghai Maritime University Institute of Logistics Science and Engineering Shanghai201306 China Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai200240 China

ISBN: (纸本)9798350375909

In this work, we proposed a glucose sensor formed by tilted fiber Bragg gratings (TFBGs). As tilt angles increases, the bandwidth of the mode region excited by the SMF-TFBG gradually enlarges with the increment of the tilt angle and the wavelength of TFBGs shifts to shorter wavelength overall. TFBGs with different tilt angles for glucose concentration measurement have been investigated and analyzed experimentally. When the concentration of glucose solution increases, the cut-off mode shifts to a longer wavelength. In addition, the glucose concentration sensitivities of the device depend on tilt angles of TFBG. We studied the glucose sensitivity of 6°, 8°, and 10° tilted fiber Bragg gratings (TFBGs), with the 10° achieving a maximum sensitivity of 80.71pm/(mg/ml). That means TFBGs with a large angle has a potential application for glucose concentration measurement in the fields of chemical and biomedical sensing. © 2024 IEEE.

关键词： Glucose sensors

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A Hybrid optical Fiber Interferometer Based on Capillary and Three-core Fiber for Refractive Index Detection

A Hybrid Optical Fiber Interferometer Based on Capillary and...

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2024 Photonics and Electromagnetics Research Symposium, PIERS 2024

作者： Cao, Jie Xu, Feng Dai, Ruichen Ding, Mengjiao Zhao, Yunhe Shanghai Maritime University College of Information Engineering Shanghai201306 China Shanghai Maritime University Physical Education Department Shanghai201306 China Shanghai Maritime University Institute of Logistics Science and Engineering Shanghai201306 China Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai200240 China

ISBN: (纸本)9798350375909

In this paper, we proposed and experimentally investigated a hybrid optical fiber interferometer consisting of three-core fiber (TCF) and capillary fiber (CF) for refractive index (RI) detection. The hybrid fiber structure forms from a section of 2 mm TCF fused between two sections of 2 mm CF, in which two single-mode fibers (SMFs) act as lead-in and lead-out fibers, namely, an SMF-CF-TCF-CF-SMF (SCTCS) structure. The sensing part of the structure is only 6 mm in length. The RI sensitivity is measured to be 392.8 nm/RIU and 1844.5 nm/RIU in the region of 1.333-1.4385 and 1.442-1.457, respectively. Moreover, the proposed sensor shows thermal stability against temperature variations. Therefore, the device has good prospects for development in RI measurement in complicated environmental monitoring. © 2024 IEEE.

关键词： Single mode fibers

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Enhanced Frequency Conversion in Parity-Time Symmetry Line

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Physical Review Letters 2024年第25期132卷 256902-256902页

作者： Jiankun Hou Jiefu Zhu Ruixin Ma Boyi Xue Yicheng Zhu Jintian Lin Xiaoshun Jiang Yuanlin Zheng Xianfeng Chen Ya Cheng Li Ge Wenjie Wan State Key Laboratory of Advanced Optical Communication Systems and Networks University of Michigan-Shanghai Jiao Tong University Joint Institute Department of Physics and Astronomy State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-Intense Laser Science National Laboratory of Solid-State Microstructures College of Engineering and Applied Science and School of Physics

Non-Hermitian degeneracies reveal intriguing and nontrivial behaviors in open physical systems. Examples like parity-time (PT) symmetry breaking, topological encircling chirality, and enhanced sensing near an exceptional point (EP) are often associated with the abrupt nature of the phase transition around these degeneracies. Here we experimentally observe a cavity-enhanced second-harmonic frequency (SHG) conversion on a PT symmetry line, i.e., a set consisting of open-ended isofrequency or isoloss lines, both terminated at EPs on the Riemann surface in parameter space. The enhancement factor can reach as high as 300, depending on the crossing point whether in the symmetry or the broken phase of the PT line. Moreover, such enhancement of SHG enables sensitive distance sensing with a nanometer resolution. Our works may pave the way for practical applications in sensing, frequency conversion, and coherent wave control.

关键词： Critical phenomena PT-symmetric quantum mechanics Phase transitions Microcavity & microdisk lasers Non-Hermitian systems

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Robust continuous-variable quantum key distribution in the finite-size regime

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Photonics Research 2024年第11期12卷 2549-2558页

作者： YUEHAN XU TAO WANG XIAOJUAN LIAO YINGMING ZHOU PENG HUANG GUIHUA ZENG State Key Laboratory of Advanced Optical Communication Systems and Networks Center of Quantum Sensing and Information ProcessingShanghai Jiao Tong UniversityShanghai 200240China Shanghai Research Center for Quantum Sciences Shanghai 201315China Hefei National Laboratory Hefei 230088China Shanghai XT Quantech Co. Ltd.Shanghai 200241China

Quantum key distribution(QKD)has been proven to be theoretically unconditionally ***,any theoretical security proof relies on certain *** QKD,the assumption in the theoretical proof is that the security of the protocol is considered under the asymptotic case where Alice and Bob exchange an infinite number of *** the continuous-variable QKD(CV-QKD),the finite-size effect imposes higher requirements on block size and excess noise ***,the local local oscillator(LLO)CV-QKD system cannot be considered time-invariant under long blocks,especially in cases of environmental ***,we propose an LLO CV-QKD scheme with time-variant parameter estimation and *** first establish an LLO CV-QKD theoretical model under the temporal modes of continuous-mode ***,a robust method is used to compensate for arbitrary frequency shift and arbitrary phase drift in CV-QKD systems with longer blocks,which cannot be achieved under traditional time-invariant parameter ***,the digital signal processing method predicated on high-speed reference pilots can achieve a time complexity of O*** the experiment,the frequency shift is up to 89.05 MHz/s and phase drift is up to 3.036 Mrad/s using a piezoelectric transducer(PZT)to simulate the turbulences in the practical *** a signal-to-interference ratio(SIR)of−51.67 dB,we achieve a secret key rate(SKR)of 0.29 Mbits/s with an attenuation of 16 dB or a standard fiber of 80 *** work paves the way for future long-distance field-test experiments in the finite-size regime.

关键词： finite proof size

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Comb-based photonic neural population for parallel and nonlinear processing

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Photonics Research 2022年第1期10卷 174-182页

作者： BOWEN MA JUNFENG ZHANG WEIWEN ZOU State Key Laboratory of Advanced Optical Communication Systems and Networks Intelligent Microwave Lightwave Integration Innovation Center(imLic)Department of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China

It is believed that neural information representation and processing relies on the neural population instead of a single *** neuromorphic photonics,photonic neurons in the form of nonlinear responses have been extensively studied in single devices and temporal ***,to construct a photonic neural population(PNP),the process of scaling up and massive interconnections remain challenging considering the physical complexity and response ***,we propose a comb-based PNP interconnected by carrier coupling with superior *** unique properties of neural population are theoretically and experimentally demonstrated in the comb-based PNP,including nonlinear response curves and population activities coding.A classification task of three input patterns with dual radio-frequency(RF) tones is successfully implemented in a time-efficient manner,which allows the comb-based PNP to make effective use of the ultra-broad bandwidth of photonics for parallel and nonlinear processing.

关键词： nonlinear scaling neural

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Butler Matrix Enabled Multi-Beam optical Phased Array for Two-Dimensional Beam-Steering 27

Butler Matrix Enabled Multi-Beam Optical Phased Array for Tw...

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27th OptoElectronics and communications Conference/International Conference on Photonics in Switching and Computing, OECC/PSC 2022

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

We demonstrate a multi-beam optical phased array based on a 4×4 Butler matrix. The device shows the capability of two-dimensional multi-beam steering with a pm 30^{circ}×8^{circ} field-of-view through a shar... 详细信息

ISBN: (数字)9784885523366

ISBN: (纸本)9784885523366

关键词： Beamforming

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