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5th China and International Young Scientist Terahertz Conference, YTHZ 2024

作者： Li, Si-Qi Zhang, Feng Zhang, Yue-Yi Lei, Yu-Lu Yang, Ji-Tao Du, Chao-Hai State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing100871 China

ISBN: (纸本)9789819737857

Quasi-bound states in the continuum (quasi-BICs) of localized spoof surface plasmons (LSSPs) have high quality factors (Q-factors) because of low radiation loss. In this paper, permittivity-asymmetric quasi-BICs of LSSPs are proposed. The unit cell of the metasurface contains a circular grating and two dielectric sheets. The quasi-BICs of the LSSPs are realized by breaking the symmetry of the permittivity of the dielectric sheets. This paper provides a new way to construct the quasi-BICs of the LSSPs. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Permittivity

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Maniputing Brillouin Scattering on Chip Using Suspended Anti-resonant Acoustic Waveguides

Maniputing Brillouin Scattering on Chip Using Suspended Anti...

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CLEO: Science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

作者： Lei, Peng Xu, Mingyu Bai, Yunhui Chen, Zhangyuan Xie, Xiaopeng State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing100871 China

Inspired by the anti-resonant properties of hollow-core fibers, we introduce suspended anti-resonant acoustic waveguides for on-chip phonon confinement and selection. It enables record-breaking achievements in forward... 详细信息

关键词： Brillouin scattering

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Maniputing Brillouin Scattering on Chip Using Suspended Anti-resonant Acoustic Waveguides

Maniputing Brillouin Scattering on Chip Using Suspended Anti...

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2024 Conference on Lasers and Electro-Optics, CLEO 2024

ISBN: (纸本)9781957171395

关键词： Brillouin scattering

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Compensation of Scale Factor Error for Open-loop Fiber Optic Gyroscopes

Compensation of Scale Factor Error for Open-loop Fiber Optic...

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CLEO: Science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

作者： Zhu, Lanxin Huang, Huimin Cao, Xinyu Chen, Yanjun Li, Zhengbin State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing100871 China

Theoretical analysis of the scale factor nonlinearity (SFN) in open-loop fiber optic gyroscopes is conducted. A k-factor compensation method is introduced, effectively reducing SFN to 2.5 ppm over the range of -300 to... 详细信息

关键词： Gyroscopes

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Slow Light Enhanced On-chip Stimulated Brillouin Scattering

Slow Light Enhanced On-chip Stimulated Brillouin Scattering

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CLEO: Science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

作者： Xu, Mingyu Lei, Peng Bai, Yunhui Chen, Zhangyuan Xie, Xiaopeng State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing100871 China

We report slow-light enhancement of stimulated Brillouin scattering on SOI for the fisrt time. With suspended Bragg grating structure, the device achieve a 2.1-fold of Brillouin gain coeffiecient. © Optica Publis... 详细信息

ISBN: (纸本)9781957171395

关键词： Stimulated Brillouin scattering

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Sensitivity-enhanced fiber optic gyroscope for rotational seismology

Sensitivity-enhanced fiber optic gyroscope for rotational se...

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2023 advanced Fiber Laser Conference, AFL 2023

作者： Wang, Wenbo Zhu, Lanxin He, Yan Chen, Yanjun Huang, Huimin Cao, Xinyu Shi, Fangshuo Li, Zhengbin State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing100871 China

ISBN: (纸本)9781510677661

The measurement of rotational components in seismic waves holds significant importance in various fields, including seismic early warning, subsurface structure inversion, and the study of Earth's internal dynamic processes. The interferometric fiber optic gyroscope (IFOG) is a kind of sensor that measures the rotational velocity of an object based on the Sagnac effect. In this study, a synchronous four-state modulation scheme based on a light source sharing configuration is employed to suppress RIN. Moreover, this work extensively investigates the impact of shot noise and Johnson-Nyquist noise. By adjusting the modulation depths of the two minimum configurations, the influence of shot noise and Johnson-Nyquist noise is well-handled while achieving RIN suppression. Furthermore, this scheme avoids introducing any external feedback, thereby preventing a decrease in sensitivity caused by the dead zone issue. In a test on detecting the rotation rate of the Earth, a self-noise level of 55 nrad/s/Hz1/2 and an angular random walk of 1.5 × 10-4 deg/h1/2 are achieved with an enclosed area of only 25.5 m2. Compared to the minimum configuration using the conventional phase generated carrier algorithm, the scheme realizes a 20-fold reduction in self-noise and an 18-fold reduction in angular random walk. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Seismology

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Performance Improvement of Adaptive N-Square PS-QAM Based on LUT for Flexible Coherent PON

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Journal of Lightwave Technology 2025年第12期43卷 5569-5578页

作者： Lin, Gengming Zhu, Yixiao Yan, Zijun Cheng, Ziyu Zhuge, Qunbi Hu, Weisheng Shanghai Jiao Tong University State Key Lab of Advanced Optical Communication Systems and Networks School of Electronic Information and Electrical Engineering Department of Electronic Engineering Shanghai200240 China

Flexible coherent passive optical network (PON) is recognized as an advanced capacity optimization strategy for beyond 100G PON due to its flexibility and adaptability, which are pivotal for the evolution of high-capacity optical access networks. In this study, we propose an adaptive N-square QAM scheme compatible with probabilistic shaping (PS), enabling a more continuous variation of shaping entropy compared to standard 2M-QAM shaping scheme and improved frequency offset estimation (FOE) accuracy in blind 4th-power Fast-Fourier-transform (FFT) algorithm. In experimental demonstrations, dynamic-range and data-rate product (DRDRP) of uniform N2-QAM surpasses that of uniform 2M-QAM by 86 dB·Gbps. The DRDRP of PS N2-QAM also outperforms that of PS 2N-QAM by around 41 dB·Gbps. The development of PON optimization scheme for multi-carrier transmission is achieved through the generation of a look-up table (LUT) based on channel signal-to-noise ratio (SNR) conditions. The feasibility of the LUT is demonstrated under different super-Gaussian filter parameter settings at the back-to-back (B2B) scenario. After 20-km standard single-mode fiber (SSMF) transmission, the normalized generalized mutual information (NGMI) is greater than 0.985 across four subcarriers with varying received optical power (ROP) from -16 to -11 dBm. © 2025 IEEE.

关键词： Single mode fibers

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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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Near-Far Field Beamforming for Holographic Multiple-Input Multiple-Output

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Journal of communications and Information networks 2023年第2期8卷 99-110页

作者： Yutong Zhang Boya Di Hongliang Zhang Lingyang Song State Key Laboratory of Advanced Optical Communication Systems and Networks School of ElectronicsPeking UniversityBeijing 100871China School of Electronic and Computer Engineering Peking University Shenzhen Graduate SchoolShenzhen 518055China

Recently,holographic multiple-input multiple-output(HMIMO)has motivated its potential use to support high-capacity data transmission with spatially quasi-continuous *** a practical instance of HMIMO,reconfigurable refractive surfaces(RRSs)equipped with numerous metamaterial elements are utilized as antennas by refracting incident signals from signal *** this paper,we investigate a multi-user communication system with an RRS deployed as the base station(BS)’s transmit *** mitigate the high overhead of accurate channel state information(CSI)acquisition,the codebook design and beam training are employed to perform *** the large scale of RRS,users are likely to be randomly distributed in both the near and far fields around the BS,which is unknown in *** considering radiation characteristics in both fields,a near-far field codebook is designed to be applicable to all users,regardless of their *** reduce overhead,a multi-user beam training is proposed to serve all users simultaneously by enhancing each codeword capable of covering multiple *** a general case that includes users in both fields,simulation results indicate that,without prior knowledge of user distribution,the proposed scheme outperforms state-of-the-art ones in terms of sum rate and overhead.

关键词： near-far field codebook design RRSs multi-user beam training

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

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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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