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Ultrafast soliton dynamics from an all-fiber self-starting thulium-doped Mamyshev oscillator

Optics Letters 2025年第3期50卷 1025-1028页

作者： Shi, Zhifeng Sun, Shijie Wang, Qingbo Liu, Yan-Ge Wang, Zhi Wang, Pan Institute of Modern Optics Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Nankai University Tianjin300350 China

The generation of high-performance pulses in the 2 µm wavelength range has been widely considered. A Mamyshev oscillator featuring cascaded spectral broadening and offset spectral filtering is an excellent platform for generating high-energy femtosecond pulses. In order to make up for the shortcomings of complex structure and unsuitability for practical use, in this Letter, we present an experimental investigation of an all-fiber thulium-doped Mamyshev oscillator that enables self-starting operation and generates high-performance pulses. The oscillator emits pulses with energy of up to 7.5 nJ, which can be compressed to 350 fs. Furthermore, we investigate the nonlinear dynamics of the multi-pulse state, such as soliton molecules and high-order harmonic mode-locking. The oscillator generates 130th order harmonic mode-locking that corresponds to the repetition rate of 588 MHz, and the signal-to-noise ratio exceeds 60 dB. © 2025 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.

关键词： Pulse repetition rate

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Laser image refractive index sensor based on the combination of a coreless optical fiber and a digital camera

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optoelectronics Letters 2025年第2期21卷 65-68页

作者： GUO Jingzhong LAN Feng CHEN Xiang LIU Haifeng Xi’an Institute of Space Radio Technology Xi’an 710100China Key Laboratory of Optoelectronic Sensor and Sensing Network Technology College of Electronic Information and Optical EngineeringNankai UniversityTianjin 300350China

As a laser passes through a scattering medium,the light interacts with the irregular reflections within the medium,resulting in light scattering and the formation of *** this paper,an image sensor based on the combination of a coreless optical fiber and a digital camera is proposed for liquid refractive index sensing *** coreless fiber is used as a sensing unit,and the change in the speckle pattern is measured using the digital correlation method to detect the magnitude of the liquid's refractive *** experimental results indicate that the laser image sensing technique is capable of effectively distinguishing liquid samples with refractive indices ranging from 1.332 8 to1.390 8,with a sensing sensitivity of-1.306 ***,the laser image sensing technique,with its advantages of high experimental reproducibility,simple system design,remote over-control,holds great research significance and potential application in laser communication and sensor integration.

关键词： fiber scattering optical

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Design of improved error-rate sliding window decoder for SC-LDPC codes: reliable termination and channel value reuse

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optoelectronics Letters 2025年第4期21卷 212-217页

作者： JIA Xishan LI Jining YAO Yuan WANG Yifan LIU Bo XU Degang School of Precision Instruments and Opto-electronics Engineering Tianjin UniversityTianjin 300072China Key Laboratory of Optoelectronics Information Technology(Ministry of Education) Tianjin UniversityTianjin 300072China Institute of Modern Optics College of Electronic Information and Optical EngineeringNankai UniversityTianjin 300350China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin 300350China

In this paper,an improved error-rate sliding window decoder is proposed for spatially coupled low-density parity-check(SC-LDPC)*** the conventional sliding window decoder,the message retention mechanism causes unreliable messages along the edges of belief propagation(BP)decoding in the current window to be kept for subsequent window *** improve the reliability of the retained messages during the window transition,a reliable termination method is embedded,where the retained messages undergo more reliable parity ***,decoding failure is unavoidable and even causes error propagation when the number of errors exceeds the error-correcting capability of the *** mitigate this problem,a channel value reuse mechanism is designed,where the received channel values are utilized to reinitialize the ***,considering the complexity and performance of decoding,a feasible sliding optimized window decoding(SOWD)scheme is ***,simulation results confirm the superior performance of the proposed SOWD scheme in both the waterfall and error floor *** work has great potential in the applications of wireless optical communication and fiber optic communication.

关键词： reliable termination message retention mechanism reliable termination method sliding window decoderthe error rate sliding window decoder belief propagation bp decoding retained messages

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CRS-based Joint CFO and Channel Estimation using Deep Learning in OFDM-based Vehicular Communication Systems

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IEEE Transactions on Wireless Communications 2025年第5期24卷 3882-3893页

作者： Wu, Hong Chen, Zhuo Liu, Zhiang Geng, Xue Zhao, Yingxin Liu, Zhiyang Nankai University College of Electronic Information and Optical Engineering Tianjin300350 China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin300350 China Nankai University Engineering Research Center of Thin Film Optoelectronics Technology Ministry of Education Tianjin300350 China Nankai University Institute of Robotics and Automatic Information Systems College of Artificial Intelligence Tianjin Key Laboratory of Intelligent Robotics Tianjin300350 China

Vehicular communication in high mobility environments has been widely explored in recent years. However, due to the existence of carrier frequency offset (CFO) and dynamic channel, the performance of vehicular communication systems over fast time-varying scenes drops severely. To address this problem, in this paper, we propose a simple and effective CRS-based joint CFO and channel estimation baseline method using deep learning (DL) for orthogonal frequency division multiplexing (OFDM) systems. Concretely, we construct a joint neural network (NN) architecture consisting of a CFO estimation network (CFOENet) based on fully connected layers and a channel estimation network (CENet) composed of convolutional layers. The proposed NN architecture can fully exploit the correlation of the cell reference signal (CRS), while learning the CFO characteristics and channel state information (CSI) changes simultaneously, which highly improves the pilot usage efficiency. We conduct adequate simulation experiments, and the results demonstrate that the proposed DL-based scheme can achieve better performance in terms of CFO estimation, channel estimation and overall system performance than conventional methods, while our method has stronger robustness and generalization ability under various channel conditions. The proposed joint CFO and channel estimation scheme has great potential in the field of the Internet of Vehicles. © 2002-2012 IEEE.

关键词： Frequency allocation

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Characterization of Photonic Temperature sensors by Comparative Human Body Measurements Using Waveguide Bragg Grating and Microring Resonator-Based sensors

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IEEE sensors Journal 2025年第9期25卷 15005-15012页

作者： Li, Xiaolin Li, Hongqiang Xie, Fanglin Han, Ming Zhang, Lizhen Zhang, Shanshan Li, Enbang Tiangong University Tianjin Key Laboratory of Optoelectronic Detection Technology and Systems School of Electronics and Information Engineering Tianjin300387 China Tiangong University Shaoxing Keqiao Institute Zhejiang Shaoxing312030 China Tiangong University Engineering Teaching Practice Training Center Tianjin300387 China Nankai University Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Institute of Modern Optics Tianjin300071 China University of Wollongong Centre for Medical Radiation Physics School of Physics Faculty of Engineering and Information Sciences WollongongNSW2522 Australia

Human body temperature is an important indicator of physical health. Waveguide Bragg grating (WBG)- and microring resonator (MRR)-based polymer optical waveguide temperature sensors provide alternative methods for monitoring the human body temperature. In this study, optical waveguide temperature sensors, with a combination of polymethylmethacrylate (PMMA) and polydimethylsiloxane (PDMS) for the formation of waveguide structures, are designed and fabricated via a polymer-based fabrication process to achieve real-time temperature measurements in situ. We experimentally characterized and compared the sensor thermal properties within the temperature range of 35 °C–40 °C. Based on the results from our study, the WBG and MRR temperature sensors had high-sensitivity properties. The temperature sensitivity coefficient of the WBG temperature sensor was −177.6 pm/°C and that of the MRR temperature sensor was −0.03035 mW/°C. The error of these two temperature sensors did not exceed 0.1 °C. These sensors show great promise as basic sensing elements in optical waveguide sensor applications for the early detection and monitoring of heat-related illnesses. © 2001-2012 IEEE.

关键词： Optical waveguides

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Outage Performance Analysis for RIS-Enabling Full-Duplex Cellular Symbiotic Radio network

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IEEE Transactions on Vehicular technology 2025年

作者： Liang, Zhanqian Han, Shiying Liang, Ying-Chang Nankai University Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology College of Electronic Information and Optical Engineering Tianjin300350 China University of Electronic Science and Technology of China Center for Intelligent Networking and Communications Chengdu611731 China

Aiming at breaking through the transmission distance limitation faced by symbiotic radio, in this correspondence, reconfigurable intelligent surface (RIS) is introduced to enable symbiotic transmission within cellular range. To avoid high-cost channel estimation, the phase shifting of the RIS is designed only based on the channel state information of the cascaded backscatter channel which is easy to obtain. Outage probabilities of the backscatter device (BD) and the ambient transmission, both in parasitic and commensal modes, are derived based on Lyapunov's theorem and Hermite-Gauss quadrature. Simulation results illustrate that the BD outage performance is highly sensitive to the number of RIS reflection elements (N) both in parasitic and commensal modes. When N is sufficiently large, its further increment has little impact on the outage probability of the ambient system, although the phase shift is designed merely to enhance the BD transmission. It also offers a guideline in coordinating N with the ambient transmit power to balance between the outage performance of the ambient system and that of the backscatter system. © 1967-2012 IEEE.

关键词： Cellular radio systems

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Robust Design of Aerial Reconfigurable Intelligent Surface-Enabled URLLC Systems with Hardware Impairments

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IEEE Transactions on Vehicular technology 2025年

作者： Chen, Yongzhi Song, Xiaoyang Wu, Hong Zhao, Yingxin Liu, Zhiyang College of Electronic Information and Optical Engineering Nankai University Tianjin300350 China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin300350 China Changguang Jizhi Optics Technology Co. Ltd. Jilin Province Changchun China

Ultra-Reliable Low-Latency Communication (URLLC) has imposed significant challenges on the Internet of Things (IoT) networks due to its stringent Quality of Service (QoS) requirements, especially in practical scenarios with unfavorable propagation environments and non-ideal hardware. As a promising technology in future communication systems, reconfigurable intelligent surface (RIS) has been expected to improve the system performance by reconfiguring the propagation environment. In this paper, we investigate a practical aerial RIS-assisted URLLC system in the presence of transceiver hardware impairments where the RIS is mounted on an unmanned aerial vehicle (UAV). We aim to maximize the weighted sum spectral efficiency (WSSE) by jointly optimizing the transmit power, the passive beamforming, and the UAV's location. As the primal problem is non-convex with coupled variables, the problem is first reformulated by using fractional programming (FP), and decomposed to subproblems with decoupled variables. An alternative optimization (AO) algorithm is then proposed to jointly optimize the passive beamforming, the position of UAV, and transmit power at the IoT devices. Simulation results verify that the proposed robust design can significantly improve the WSSE performance compared to the conventional non-robust scheme. And we reveal hardware impairments at the IoT devices have more impact on WSSE than the control center (CC). © 2025 IEEE.

关键词： Resource allocation

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Terahertz metalenses for needle beam generation through coherent polarization multiplexing

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Chinese Optics Letters 2025年第2期 151-155页

作者：关胜男程洁嵘徐海峰李帆常胜江 Institute of Modern Optics Nankai University Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology

Lenses with desired depth of focus have crucial applications in imaging systems. However, there is little theoretical guidance to extend the depth of focus beyond numerical optimization. The on-demand construction of the Jones matrix using the composite metasurface brings a powerful tool for polarization-multiplexed functionalities. Here, based on polarizationmultiplexed focusing in four linear polarization channels, we propose a straightforward method to extend the depth of focus based on the coherent superposition of each linear polarization channel. The metalens shows long and uniform needle beam focusing with a depth of focus of 46λ in circularly polarized excitation in the experiment, which offers a promising tool to tailor the terahertz focal spot for imaging applications.

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A Non-Amplification, Low Detection Limit in Situ Detection Strategy for Mir-451 Based on Dark-Field Scattering Spectral Analysis

SSRN

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SSRN 2025年

作者： Zi, Xingyu Cheng, Hongen Wang, Jianqi Liu, Kuilin Liu, Guohua College of Electronic Information and Optical Engineering Nankai University Tianjin300350 China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin300350 China Engineering Research Center of Thin Film Optoelectronics Technology Ministry of Education Nankai University Tianjin300350 China

Effective non-invasive early screening methods for colorectal cancer are crucial for reducing mortality rates in patients with colorectal cancer. Since microRNA(miRNA) dysregulation has been confirmed to be closely associated with colorectal cancer, high-sensitivity and accurate quantitative miRNA detection methods are regarded as effective tools for early diagnosis. In this study, we report a non-amplification-based in Situ miRNA detection strategy using localized surface plasmon resonance (LSPR) technology, where gold nanoparticles (AuNPs) immobilized on a microfluidic chip act as biosensors and ssDNA probes are employed for specific detection. Using dark-field microscopy to analyze the spectra of individual AuNPs, we achieved detection of miR-451 with a detection limit of 56 fM. This strategy amplifies the detection signal through in situ detection, avoiding the need for sample amplification. We suggest that this detection strategy can be effectively applied to miRNA detection and absolute quantification in fecal or blood samples, potentially offering a promising alternative to current miRNA detection methods. © 2025, The Authors. All rights reserved.

关键词： Surface plasmon resonance

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Terahertz Nonvolatile Vectorial Holography With Random Repetitive Encryption and Nonreciprocal Janus Imaging Based on Magnetic Heterogeneous Integrated Metasurface

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Laser and Photonics Reviews 2025年

作者： Wang, Hao Fan, Fei Li, Pengxuan Xue, Qiang Tan, Zhiyu Zhao, Dan Zhao, Huijun Yang, Qinghui Wen, Qiye Chang, Shengjiang Institute of Modern Optics Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology Nankai University Tianjin300350 China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin300350 China School of Electronic Science and Engineering University of Electronic Science and Technology of China Chengdu610054 China School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology Shanghai200093 China

Vectorial holography expands the information dimensionalities of the image, manifesting significant value in applications such as optical encryption, and polarization multiplexing. To address challenges like erasable storage, secret key leakage, and echo noise, a dynamic terahertz vectorial holography is demonstrated based on magnetic heterogeneous integrated metasurfaces with nonvolatility and nonreciprocity, whose polarization states vary continuously along the latitude of the whole Poincare Sphere with the experimental polarization ellipticity angles in the image covering −0.23π–0.21π rad, and can be stored or erased through nonvolatile magnetic rotation. This allows for the encryption with a random dynamic polarization secret key that can be regenerated indefinitely, greatly eliminating the risk of key leakage. The crosstalk between the orthogonal polarization states in the encryption is less than 0.0056. Meanwhile, leveraging the magneto-optical nonreciprocity, the metasurface functions as a Janus hologram with one-way isolation between forward and backward illumination, of which the image area proportion of over 5 dB isolation reaches 89%, effectively eliminating echo noise and further improving the anti-interference. This work addresses the gaps in terahertz dynamic vectorial holography, realizes the nonvolatile and nonreciprocal polarization information processing, and mitigates risks of secret key leakage and echo interference. © 2025 Wiley-VCH GmbH.

关键词： Magnetic leakage

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