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Brillouin random lasing resonance enabled fast light and superluminal propagation in optical fibers

Optics Express 2025年第11期33卷 22497-22510页

作者： Xie, Haoran Xiao, Zhelan Liu, Zhiming Sheng, Liwen Zhan, Li Pang, Fufei Zhang, Liang Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication Shanghai Institute for Advanced Communication and Data Science Shanghai University Shanghai200444 China Ceyear Technologies Co. Ltd. Qingdao266555 China Shandong Electronic Test & Measurement Technology Innovation Center Qingdao266555 China State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China

We proposed and demonstrated fast light and superluminal propagation based on Rayleigh scattering-induced Brillouin random lasing resonance in optical fibers. A theoretical model of the proposed Brillouin superluminal propagation system has been established, detailing the principle of optical group velocity manipulation based on the combination of stimulated Brillouin scattering and Brillouin cross-gain modulation, for the first time to the best of our knowledge. Thanks to the randomly distributed Rayleigh scattering, Brillouin random lasing resonance with a single-longitudinal-mode lasing operation essentially contributes to fast light and superluminal propagation of the pump light signals propagating along a kilometer-long optical fiber. The temporal advancement, group velocity, and group index of sinusoidally modulated pump signals are thoroughly compared in experiments, which agree well with simulations. The dependence of the Brillouin gain fibers on the group velocity as well as the impact of Stokes power under different signal modulation frequencies on the broadening factor are systematically discussed and characterized. Furthermore, the Brillouin random lasing fast-light system is developed to offer a unique time-domain analysis solution for high-sensitivity fiber Bragg grating (FBG) temperature sensing scheme. Scalable sensitivity of the proposed sensing system can be achieved by applying different modulation frequencies. These findings may find wide potential applications in optical signal processing and hyper-sensitive detection. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Stimulated Brillouin scattering

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A Compact Low-crosstalk Silicon Waveguide Array Based on Floquet Theory

A Compact Low-crosstalk Silicon Waveguide Array Based on Flo...

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2024 Conference on Lasers and Electro-Optics/Pacific Rim, CLEO-PR 2024

作者： Chen, Yu Yi, Xiaogen Zhan, Hengjie Qiu, Ciyuan State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai China

We developed a new scheme to suppress the crosstalk between waveguides in a compact half-wavelength pitch silicon waveguide array. In the experimental demonstrations, low crosstalk (CT) of −23 dB is obtained at 1550 n... 详细信息

关键词： optical waveguides

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Smoothed analysis-based noise manipulation for spatial photonic Ising machines

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中国光学快报（英文版） 2025年第3期23卷 109-114页

作者：叶新张文甲何祖源 State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai 200240 China

The photonic Ising machine,a promising non-von Neumann computational paradigm,offers a feasible way to address com-binatorial optimization *** develop a digital noise injection method for spatial photonic Ising machines based on smoothed analysis,where noise level acts as a parameter that quantifies the smoothness *** experiments with 20736-node Max-Cut problems,we establish a stable performance within a smoothness degree of 0.04 to *** noise injection results in a 24％performance enhancement,showing a 73％improvement over heuristic Sahni-Gonzales(SG)***,to address noise-induced instability concerns,we propose an optoelectronic co-optimization method for a more streamlined smoothing method with strong stability.

关键词： photonic Ising machine smoothed analysis optoelectronic co-optimization

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Multi-channel generation of vortex beams with controllable polarization states and orbital angular momentum

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Chinese Physics B 2023年第12期32卷 90-97页

作者：吕子瑶王潘王长顺 State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China School of Data Science The Chinese University of Hong KongShenzhen 518172China

optical vortices with tunable polarization states and topological charges are widely investigated in various physical systems and practical devices for high-capacity optical ***,this kind of structured light beams is usually generated using several polarization and spatial phase devices,which decreases the configurability of optical ***,we have designed a kind of polarized optical multi-vortices generator based on the Stokes-Mueller formalism and cross-phase *** our scheme,multi-channel generation of polarized vortex beams can be realized through a single optical element and a single-input Gaussian *** polarization states and orbital angular momentum of the generated light beams are all-optically ***,the proposed polarized optical multi-vortices generator has also been demonstrated experimentally through one-step holographic recording in an azobenzene liquid-crystalline film and the experimental results agree with theoretical analysis.

关键词： light field modulation holography optical vortex polarization

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Design of Large-Scale OXC for the Next-Generation ROADM 16

Design of Large-Scale OXC for the Next-Generation ROADM

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16th Pacific Rim Conference on Lasers and Electro-Optics, CLEO-PR 2024

作者： Ye, Tong Luo, Jiayi Li, Herui Yao, Yibei Shanghai Jiao Tong University State Key Lab of Advanced Optical Communication Systems and Networks Shanghai China

Using multiple MEMSes sandwiched between two columns of WSSes, this paper designs a low-loss, nonblocking, and scalable OXC that is suitable for the future SDM optical network with a smaller number of wavelengths per ... 详细信息

ISBN: (纸本)9798350372076

关键词： optical fiber communication

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Intelligent indoor metasurface robotics

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National Science Review 2023年第8期10卷 20-32页

作者： Hanting Zhao Shengguo Hu Hongrui Zhang Zhuo Wang Hao Dong Philipp del Hougne Tie Jun Cui Lianlin Li State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Center on Frontiers of Computing Studies School of Computer Science Peking University The French National Centre for Scientific Research(CNRS) University of Rennes State Key Laboratory of Millimeter Waves Southeast University

Intelligent indoor robotics is expected to rapidly gain importance in crucial areas of our modern society such as at-home health care and factories. Yet, existing mobile robots are limited in their ability to perceive and respond to dynamically evolving complex indoor environments because of their inherently limited sensing and computing resources that are, moreover, traded off against their cruise time and payload. To address these formidable challenges, here we propose intelligent indoor metasurface robotics(I2MR),where all sensing and computing are relegated to a centralized robotic brain endowed with microwave perception; and I2MR's limbs(motorized vehicles, airborne drones, etc.) merely execute the wirelessly received instructions from the brain. The key aspect of our concept is the centralized use of a computation-enabled programmable metasurface that can flexibly mold microwave propagation in the indoor wireless environment, including a sensing and localization modality based on configurational diversity and a communication modality to establish a preferential high-capacity wireless link between the I2MR's brain and limbs. The metasurface-enhanced microwave perception is capable of realizing low-latency and high-resolution three-dimensional imaging of humans, even around corners and behind thick concrete walls, which is the basis for action decisions of the I2MR's brain. I2MR is thus endowed with real-time and full-context awareness of its operating indoor environment. We implement, experimentally, a proof-of-principle demonstration at ～2.4 GHz, in which I2MR provides health-care assistance to a human inhabitant. The presented strategy opens a new avenue for the conception of smart and wirelessly networked indoor robotics.

关键词： intelligent metasurfaces intelligent robotics edge devices IoT 6G

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Laser Power Stabilization with a Cesium FADOF

Laser Power Stabilization with a Cesium FADOF

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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： Shi, Hangbo Guan, Xiaolei Wang, Zhiyang Liu, Zijie Qin, Xiaomin Gao, Zhihong Shi, Tiantian Chen, Jingbiao Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Beijing China

ISBN: (纸本)9798350311426

We achieve the stabilization of the laser power using a cesium Faraday anomalous dispersion optical filter (FADOF). We measured the transmission spectrum of the FADOF. In the transition line of 6s2S1/2 F=4→6p2P3/2 for cesium at the wavelength of 852 nm, when the laser frequency is constant, the transmission of FADOF increases rapidly and then decreases as the probe laser intensity increases. The negative correlation between FADOF transmission and laser intensity can be used to stabilize the laser power. Therefore, we tune the laser frequency to the cesium 6s2S1/2 F=4→6p2P3/2 transition line, then the power of the laser passing through the FADOF is expected to be stabilized. This work can be applied to the precision measurement field, such as atomic clocks, atomic gravimeters, atomic magnetometers, etc. © 2023 IEEE.

关键词： FADOF power stabilization

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Radio Frequency Fingerprint Extraction and Identification for Wi-Fi Signals in Noisy Channels

Radio Frequency Fingerprint Extraction and Identification fo...

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2023 IEEE MTT-S International Wireless Symposium, IWS 2023

作者： Huang, Renhui Zhang, Liuming Chai, Zhi Yang, Xuelin Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai China

ISBN: (纸本)9798350336535

A noise-robust radio frequency fingerprint (RFF) extraction and identification scheme is proposed and demonstrated for Wi-Fi device recognition. Specifically, an RFF extractor pre-trained by supervised contrastive learning extracts the distinctive features from the spectrogram, which is produced by Fourier-based sychrosqueezing transform (FSST). Then a neural network-based classifier is adopted for precise device identification with the extracted RFF. Utilizing 11 commercial wireless network interface controllers (WNICs), the experimental results demonstrate the significant performance improvement for noisy channels, with classification accuracy achieving up to 95.7% and 86% when the signal-to-noise ratio (SNR) is 10 and 5 dB, respectively. © 2023 IEEE.

关键词： Signal to noise ratio

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A 780 nm Dual-Frequency Faraday Laser

A 780 nm Dual-Frequency Faraday Laser

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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： Qin, Xiaomin Liu, Zijie Shi, Tiantian Chen, Jingbiao Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Beijing China

ISBN: (纸本)9798350311426

We demonstrate a dual-frequency (DF) Faraday laser operating on 780 nm using an 87Rb Faraday anomalous dispersion optical filter (FADOF) as the frequency selection element. The frequencies of the two modes correspond to the transition of 87Rb 52S1/2 (F=1) to 52P3/2 and 52S1/2 (F=2) to 52P3/2, respectively. The output laser wavelength has good robustness to the laser diode's current and temperature fluctuations. The frequency difference between the two modes is tunable with the temperature of 87Rb vapor cell and cavity length. Besides, the two modes share good coherence with the most probable linewidth of the beat-note spectra being 3 kHz. Such a 780 nm DF Faraday laser can be used in precision measurement, such as, laser frequency stabilization, optical microwave generation, and coherent population trapping (CPT) atomic clocks. © 2023 IEEE.

关键词： dual-frequency laser Faraday anomalous dispersion optical filter (FADOF) Faraday laser

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Frequency Stabilization for the Faraday Laser Operating on Rb 780 nm Transition

Frequency Stabilization for the Faraday Laser Operating on R...

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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： Liu, Zijie Qin, Xiaomin Shi, Tiantian Dang, Anhong Chen, Jingbiao Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Beijing China

ISBN: (纸本)9798350311426

Compared with Faraday anomalous dispersion optical filter, the atom optical filter based on the Voigt effect can generate a stronger and more uniform magnetic field with a compact size of the magnet. The transmission characteristics of the Voigt anomalous dispersion optical filter (VADOF) are further investigated, and a transmission spectrum with ultra-low bandwidth immune to the cell temperature is constructed. Therefore, this optical filter has the potential to perform well in a complex environment, such as outdoor and out space. Importantly, the VADOF could be applied to a diode laser as a frequency-selective element, named "Voigt laser", contributing to better frequency stability. © 2023 IEEE.

关键词： Faraday anomalous dispersion optical filter (FADOF) Faraday laser frequency standard modulation transfer spectroscopy

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