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Compact 517 MHz soliton mode-locked Er-doped fiber ring laser

Photonics Research 2016年第1期4卷 27-29页

作者： Jian Zhang Ziyun Kong Yizhou Liu Aimin Wang Zhigang Zhang State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Engineering and Computer Science Peking University

We report on a compact passive mode-locked Er:fiber ring laser operated at the fundamental repetition rate of 517 MHz, which we believe is the highest fundamental repetition rate ever reported in a ring cavity fiber *** key technique is the employment of two innovative high-power wavelength domain multiplexer collimators with all gain fiber cavity suited for the high power(up to 2 W) pumping. The laser is featured with a direct chirpfree output pulse, which is 97 fs without extracavity compression at an average output power of 90 mW.

关键词： mode rate Compact 517 MHz soliton mode-locked Er-doped fiber ring laser ring

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SPP-MIM Hybridization Meta-Films for High-Sensitivity and High-Stability Biosensing at optical Fiber End-Facets

SSRN

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SSRN 2025年

作者： He, Chenjia Sun, Xiaqing Zhong, Hao Meng, Qing-Feng Zhou, Xuetong Liu, Sihang Zheng, Li Kong, Xiangyang Chen, Shengfu Yang, Tian State Key Laboratory of Advanced Optical Communication Systems and Networks Key Laboratory for Thin Film and Microfabrication The Ministry of Education School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai200240 China School of Material Science and Engineering Shanghai Jiao Tong University Shanghai200240 China State Key Laboratory of Materials for Integrated Circuits Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai200050 China Key Laboratory of Biomass Chemical Engineering College of Chemical and Biological Engineering Zhejiang University Hangzhou310027 China

The specific optical dispersion of metal-insulator-metal (MIM) waveguide allows the hybridization of surface plasmon polaritons (SPPs) and the waveguide, which is not possible with dielectric waveguides. SPP-MIM hybridization creates such a meta-film that integrates the previously incompatible respective merits of SPR and LSPR, including a flat biosensing interface, a high surface sensitivity and efficient coupling with spatially confined illumination. On the other hand, to achieve stable and reproducible performance is one of the greatest but unresolved challenges for nanophotonic biosensors. Yet the underlying mechanism of instability is not well understood. We conclude, from a literature survey, that the stability of biosensing performance is strongly correlated with the flatness of the physical sensing interface. A nanostructured interface, at least, would introduce surface gas nanobubbles to interfere with the interactions between analytes in the solution and ligands on the solid substrate. Hence, the SPP-MIM meta-film provides a capable solution for sealing photonic nanostructures under a flat and stable biosensing interface. We embed the meta-film with a plasmonic crystal cavity and integrate it on a single-mode fiber's end-facet to detect biomolecular interactions. This device demonstrates highly reproducible sensorgrams and convincing detection of biotinylated proteins at down to 30 fM, with the sensorgrams following the Langmuir model. Having both high sensitivity and high stability, our device proposal provides an unprecedentedly comprehensive solution for optical fiber-tip plasmonic devices. It has immediate application values for biomolecular interaction analysis and drug discovery. © 2025, The Authors. All rights reserved.

关键词： MIM devices

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Beam Pattern Modulation Embedded Hybrid Transceiver Optimization for Integrated Sensing and communication

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IEEE Transactions on Wireless communications 2025年

作者： Liu, Boxun Gao, Shijian Yang, Zonghui Cheng, Xiang Yang, Liuqing Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Beijing100871 China Internet of Things Thrust Guangzhou511400 China Internet of Things Thrust Intelligent Transportation Thrust Guangzhou511400 China The Hong Kong University of Science and Technology Department of Electronic and Computer Engineering Department of Civil and Environmental Engineering SAR Hong Kong Hong Kong

Integrated sensing and communication (ISAC) emerges as a promising technology for 6G, particularly in the millimeter-wave (mmWave) band. However, the widely utilized hybrid architecture in mmWave systems compromises multiplexing gain due to the constraints of limited radio-frequency (RF) chains. Moreover, additional sensing functionalities exacerbate the impairment of spectrum efficiency (SE). In this paper, we present an optimized beam pattern modulation-embedded ISAC (BPM-ISAC) transceiver design, which spares one RF chain for sensing and uses the remaining ones for communication. To compensate for the reduced SE, index modulation across communication beams is applied. We formulate an optimization problem aimed at minimizing the mean squared error (MSE) of the sensing beampattern, subject to a symbol MSE constraint. This problem is then solved by sequentially optimizing the analog and digital parts. Both the multi-aperture structure (MAS) and the multi-beam structure (MBS) are considered in the analog part. We conduct theoretical analysis on the asymptotic pairwise error probability (APEP) and the Cramér-Rao bound (CRB) of direction of arrival (DoA) estimation. Numerical simulations validate the overall enhanced ISAC performance over existing alternatives. © 2025 IEEE. All rights reserved.

关键词： Mean square error

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A 300-MHz Bandwidth Balanced Homodyne Detector for Continuous Variable Quantum key Distribution

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Chinese Physics Letters 2013年第11期30卷 117-119页

作者： HUANG Duan FANG Jian WANG Chao HUANG Peng ZENG Gui-Hua State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiaotong UniversityShanghai 200240

In Gaussian-modulated coherent-state quantum key distribution,the measurement of quadratures of coherent states is performed by using a homodyne ***,conventional detectors usually suffer from narrow *** present a method to design a high-speed shot-noise-limited balanced homodyne detector.A 300-MHz bandwidth detector is experimentally tested and the level of shot noise is 14 dB higher than the electronic *** results show that a detector with this method is potential to design a GHz bandwidth detector for continuous variable quantum key distribution at a low level of ratio of shot noise to electronic noise.

关键词： coherent quantum narrow

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Thulium-Doped Fiber Amplifier for Blue Light Signal Amplification

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China communications 2019年第5期16卷 181-188页

作者： Muhammad Hanif Ahmed Khan Khushik Chun Jiang State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University

Fluoride-based thulium-doped visible light fiber amplifier(TmVLFA), which can be used to amplify the blue light signal for a visible light communication(VLC) system,is theoretically demonstrated for the first time according to the best of our knowledge. The transition rate equations and power propagation equations are solved to predict the dependence of the gain and noise figure on fiber parameters. The numerical results show that with the pump wavelength 1150 nm and pump power 800 mW, 2.75 m long thulium-doped fiber can amplify blue light(480 nm) signal up to 33.3 dB, and the noise figure is in the range from 3.0 to 3.5 dB. The model and numerical results encourage the use of fiber amplifier in VLC system for blue light amplification to extend the range of VLC.

关键词： Tm-doped visible light fiber amplifier visible light communication fiber amplifier gain noise figure

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Optimized Second Harmonic Generation of Femtosecond Pulse by Phase-Blanking Effect in Aperiodically optical Superlattice

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Chinese Physics Letters 2008年第4期25卷 1297-1300页

作者：孔艳陈险峰夏宇兴 Department of Physics The State Key Laboratory on Fiber Optic Local Area Communication Networks and Advanced Optical Communication System Shanghai Jiao Tong University Shanghai 200240

In order to minimize the effect of the unconsidered frequency components on the generated compression pulse, the phasing-blanking effect is taken into account of designing the one^dimensionai aperiodic domain reversal structure. Hierarchic genetic algorithm for the design of a domain reversal grating to modulate the spectrum and phase of the generated SH pulse simultaneously are presented. Our simulation shows that the quality of an output pulse is fairly improved.

关键词： MATCHING GRATINGS LITHIUM-NIOBATE COMPRESSION

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Heptagonal core anti-resonant hollow-core fiber for laser beam mode shapers

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Chinese Optics Letters 2025年第4期23卷 040607-040607页

作者： Wang, Yang Zhang, Xiaobei Chen, Wei Zhang, Qi Yang, Yong Li, Maochun Yan, Miao Wang, Tingyun 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 School of Communication and Information Engineering Shanghai University Shanghai200444 China Laboratory of Science and Technology on Marine Navigation and Control China State Shipbuilding Corporation Tianjin300131 China

We report a novel anti-resonant hollow-core fiber (ARF) with a heptagonal core surrounded by connected cladding tubes, which is employed as a laser beam mode shaper. Cladding nodes are formed between each pair of adjacent cladding tubes, which efficiently enhances the mode coupling, thus significantly suppressing higher-order modes (HOMs) within a short fiber length. Numerical investigation and simulation for variations in the curvature of each node are conducted, through which an optimized structure of cladding nodes is obtained. Experimental results demonstrate that for a 1-m-long ARF-based mode shaper, the output beam quality M2 is enabled, and the near-diffraction-limit beam quality is 1.03. The ARF presents a maximum average transmission power of 600 mW, achieving a total coupling efficiency of approximately 85%. Moreover, it is maintained for one hour without inducing any damage while maintaining beam quality. These results highlight the great potential of the mode shaper in applications such as laser surgery, precision welding, and laser writing. © 2025 Chinese Optics Letters.

关键词： Laser beams

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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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All-fiber high-resolution computational spectropolarimeter based on speckle pattern

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Chinese Optics Letters 2024年第12期22卷 95-100页

作者： Qianyu Zhou Yangyang Wan Xinyu Fan Zuyuan He State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong UniversityShanghai 200240China

The lightwave field possesses several dimensional properties,including amplitude,spectrum,phase,and *** measurements of lightwaves have diverse applications ranging from remote sensing to analytical ***,achieving high-resolution simultaneous multi-dimensional measurement of lightwaves remains *** this work,we demonstrate an all-fiber spectropolarimeter based on a speckle pattern obtained from the end of a multi-mode *** proposed system simultaneously achieves a spectral resolution of 100 pm and a polarization resolution of *** polarization measurement errors for three Stokes parameters are 3.37%,1.01%,and 0.84%,respectively,with a mean squared error of 5.3×10^(-5).This work provides novel potential for high-resolution and accurate multi-dimensional lightwave field measurements.

关键词： spectropolarimeter speckle pattern multi-mode fiber

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Design of an augmented reality display based on polarization grating

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Chinese Physics B 2019年第7期28卷 216-221页

作者： Renjie Xia Changshun Wang Yujia Pan Tianyu Chen Ziyao Lyu Lili Sun State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and AstronomyShanghai Jiao Tong University

A new optical system for an augmented reality(AR) display is proposed in this *** optical system mainly includes a ray deflector, coupling input grating, optical waveguide, and coupling output *** the ray deflector and the coupling input grating are designed based on the diffraction characteristics of the polarization grating, and the coupling output grating is the Bragg reflection *** with other AR schemes, this AR optical system not only reduces the number of projections from two to one, but also improves the efficiency of light coupling into the optical *** energy loss is reduced by utilizing the single-order diffraction characteristics of the polarization grating in its coupling input *** light deflector uses the polarization selectivity of the polarization grating and the characteristics of the rotating light of the twisted nematic liquid crystal layer to realize beam *** working principle of the optical system is experimentally and theoretically demonstrated.

关键词： augmented reality polarization grating azo liquid crystal

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