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2024 Conference on Lasers and Electro-Optics, CLEO 2024

作者： Cao, Xianyi Wang, Long Li, Tianyi Cai, Minglu Wu, Guiling Chen, Jianping Wu, Kan Shanghai Institute for Advanced Communication and Data Science State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China

A dual-comb FMCW Lidar with coherent comb stitching (CCS) technique is firstly demonstrated. CCS can simultaneously achieve 65 GHz high frequency sweeping range, millimeter-level ranging resolution and 100 kHz high vo... 详细信息

ISBN: (纸本)9781957171395

关键词： Optical radar

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Monolithic 50 GHz tunable microwave signal generation based on erbium-doped lithium niobate dual lasers

Monolithic 50 GHz tunable microwave signal generation based ...

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2024 Conference on Lasers and Electro-Optics, CLEO 2024

作者： Cai, Minglu Zhang, Xujia Li, Tianyi Shi, Hao Li, Tieying Cao, Xianyi Cui, Zekun Chen, Jianping Wu, Kan Shanghai Institute for Advanced Communication and Data Science State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China

The monolithic erbium-doped lithium niobate lasers can achieve a tunable wavelength range of 56.25 GHz and generate a 50 GHz microwave signal with a side-mode suppression ratio of 35 dB by dual lasers. © Optica P... 详细信息

ISBN: (纸本)9781957171395

关键词： Microwave generation

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Chirp-free hundred-picosecond pulse fiber laser based on carbon nanotubes mode-locker

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Optics Express 2025年第7期33卷 14850-14857页

作者： Li, Weixi Jiang, Kailin Dai, Lilong Huang, Qianqian Zou, Meng Luo, Siyu Chen, Siyu Song, Yingxiong Liu, Yunqi Yan, Zhijun Mou, Chengbo Key Laboratory of Specialty Fiber Optics and Optical Access Networks Shanghai Institute for Advanced Communication and Data Science Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication Shanghai University Shanghai200444 China School of Optical and Electronic Information National Engineering Laboratory for Next Generation Internet Access System Huazhong University of Science and Technology Wuhan430074 China

We demonstrate a narrow bandwidth passively erbium-doped mode-locked fiber laser based on single-wall carbon nanotubes (SWCNTs). The center wavelength is 1546.61 nm. The strong filtering effect and low saturable absorber (SA) modulation depth provide advantages for a long pulse duration of 323 ps. An overall spectral bandwidth of 1.3 GHz (0.01 nm) is measured by the optical heterodyne method, representing the narrowest spectral width based on SWCNT under a single filter structure. The obtained spectral width is very close to the transform-limited bandwidth of 8 pm, indicating that the pulse is chirp-free. Meanwhile, the generation of beat signals reveals the strong coherence between pulses. The repetition frequency of the laser is 7.8 MHz, and the number of longitudinal mode locks is only 166, which is the minimum number of longitudinal mode-locking in passively mode-locked laser based on material SA. At the same time, numerical simulations further support our experimental results and reveal the pulse evolution, providing evidence that SA and filter are the key factors in the generation of chirp-free long pulse. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Saturable absorbers

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All-fiber and self-starting Yb-doped Mamyshev oscillator based on nonlinear polarization evolution

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Chinese Optics Letters 2024年第12期22卷 74-79页

作者： Zecong Li Kai Wang Zinan Huang Qianqian Huang YanlüLin Weixi Li Zhichao Luo Chengbo Mou Key Laboratory of Specialty Fiber Optics and Optical Access Networks Shanghai Institute for Advanced Communication and Data ScienceJoint International Research Laboratory of Specialty Fiber Optics and Advanced CommunicationShanghai UniversityShanghai 200444China Key Laboratory of Space Active Opto-Electronics Technology Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083China Laboratory of Nanophotonic Functional Materials and Devices School of Information and Optoelectronic Science and EngineeringSouth China Normal UniversityGuangzhou 510006China

We experimentally demonstrate a Yb-doped all-fiber mode-locked laser based on the Mamyshev *** entire experimental setup operates only by injecting pump powers and adjusting polarization controllers(PCs),which realizes *** types of pulse patterns are observed at different pump powers and polarization states,including single pulses and up to eight-pulse bound-state *** operating wavelength of single-pulse mode-locking switching between 1072.3and 1043.1 nm can be realized by increasing the pump power while keeping the PCs in a fixed *** design can provide an attractive experimental model for all-fiber and self-starting Mamyshev oscillators.

关键词： Mamyshev oscillator Yb-doped fiber laser pulse dynamic pattern nonlinear polarization evolution

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Lorentz force magnetic field sensor using cladding-etched heterogeneous integrated optical fiber with triple-side nickel cores

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Optics Express 2025年第10期33卷 21678-21691页

作者： Chen, Luo Zhu, Mengshi Wei, Heming Wang, Zhifeng Zhang, Liang Pang, Fufei 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 Shanghai University No. 99 Shangda Road Shanghai200444 China

A Lorentz force magnetic field sensor is demonstrated using a cladding etched heterogeneous integrated optical fiber with triple-side nickel cores (TSNCF). The sensing fiber heterogeneously integrates three nickel side cores in a single-mode fiber. When electric current is injected into the nickel side cores in the presence of orthogonal magnetic fields, the generated Lorentz force causes the vibration of the fiber. By employing a Mach-Zehnder interferometer to detect the resulting phase shift in the optical fiber, the sensor effectively perceives the magnetic field. The results show that TSNCFs with smaller diameters demonstrate higher sensing performance due to lower fiber stiffness. The sensitivity of the 90 µm-TSNCF is 3 times that of a single side nickel core fiber with a 125 µm cladding diameter. The maximum sensitivity of magnetic field intensity achieved in our experiment is 9.91 rad/mT by using the 90µm-TSNCF. This compact, highly sensitive, and corrosion-resistant device holds potential for applications in magnetic field sensing. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Lorentz force

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Low temperature cross-sensitivity vector torsion sensor based on an in-fiber Mach-Zehnder interferometer with helical side-hole fiber

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Optics Express 2025年第10期33卷 20561-20572页

作者： Zhu, Junjie Wen, Jing Wang, Zhifeng Xin, Yue Pang, Fufei Zhu, Mengshi Zhang, Liang Wei, Heming Wen, Jianxiang 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 Shanghai University No. 99 Shangda Road Shanghai200444 China

What we believe to be a novel in-fiber vector torsion sensor based on a Mach-Zehnder interferometer (MZI) constructed using helical side-hole fibers (HSHFs) is proposed. A segment of HSHF is spliced between two single-mode fibers to excite the LP01 and LP11 modes supported by the HSHF, generating intermodal interference and forming the MZI structure. Owing to the helical side-hole configuration, the interference patterns of the LP01 and LP11 modes rotate with the applied torsion angle. A theoretical model for torsion sensing reveals that the light intensity at the resonant dip of the interference patterns varies periodically with the increasing torsion angle. In contrast, the wavelength shift of the resonant dip exhibits a linear relationship with the torsion angle, enabling precise torsion measurement. Experimental results confirm the validation of the model, showing torsion sensitivities of 2.13 dB/(rad/m) and 0.282 nm/(rad/m) for intensity and wavelength responses, respectively. Furthermore, the proposed torsion sensor shows minimal crosstalk to temperature and axial strain thanks to the interference between the two core modes. Additionally, introducing the helical structure during fiber drawing simplifies processing and preserves strength, providing a wide measurement range. The proposed HSHF-MZI torsion sensor exhibits high sensitivity, low temperature and strain crosstalk, and the ability to detect the torsion direction, making it a promising candidate for applications in structural health monitoring and engineering measurements. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Mach-Zehnder interferometers

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In-depth development of temperature insensitive refractive index Fabry-Perot optical sensor 2

In-depth development of temperature insensitive refractive i...

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2nd International Conference on Optical communication and Optical Information Processing, OCOIP 2024

作者： Gao, Yuda Luo, Yanhua Institute of Fiber Optics 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

ISBN: (数字)9781510688995

ISBN: (纸本)9781510688988

Sensors based on optical fiber interference structures offer benefits such as high sensitivity, simple fabrication and good compatibility, and are widely used in fields like biological monitoring, chemical engineering, and environmental monitoring. However, these sensors often face unavoidable cross-sensitivity issues between temperature and refractive index. Therefore, developing a new optical fiber refractive index sensor that is insensitive to temperature and has a broad refractive index measurement range remains a significant research issue. In this work, proposing a temperature-insensitive refractive index sensor featuring a two-stage Fabry-Perot (F-P) cavity made from single-mode fiber (SMF), capillary fiber (CF), and no core fiber (NCF) based on the principle of mode interference. The research experimentally investigates the sensor's sensitivity to temperature and refractive index. Results indicate that the sensor's amplitude correlates linearly with the refractive index in both optical and Fourier domains, covering a refractive index range of 1.3164 to 1.4215. In the Fourier domains, sensitivities of - 0.7184/refractive index unit (RIU) and - 0.2672/RIU are recorded at two distinct positions, respectively. A direct relationship between the amplitude and the refractive index is established. Additionally, the proposed sensor is almost insensitive to temperature in both the wavelength and Fourier domains. At the same time, experimental validation using water, ethanol, isopropanol, and glycerin solutions with varying refractive indexes, yielding results that align well with the established refractive index relationship. © 2025 SPIE.

关键词： Fabry-Perot interferometers

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Characteristics of Forward Stimulated Brillouin Scattering Temperature Sensor Based on Single Mode PbS-doped Optical Fiber 4

Characteristics of Forward Stimulated Brillouin Scattering T...

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4th International Computational Imaging Conference, CITA 2024

作者： Chen, Yu Li, Yichun Zhang, Liang Dong, Yanhua Dong, Qianni Wen, Jianxiang Zhu, Mengshi Wei, Heming Pang, Fufei 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 Shanghai University Shanghai200444 China

ISBN: (纸本)9781510688834

Forward stimulated Brillouin scattering (FSBS) has garnered increasing attention owing to its ability to sense the surrounding environment through photon-phonon interaction between optical waves and guided transverse acoustic resonances. Compared to conventional standard single mode fibers (SSMFs), the utilization of specialty fibers with diverse fiber core/cladding geometries (e.g., thin-diameter fibers, large effective area fibers, few mode fibers, and photonic crystal fibers) offers striking opportunities to enhance the FSBS interaction and diversify its functionality. In this work, temperature sensing characteristics of FSBS in single mode PbS-nanoparticle-doped optical fiber (PbSF) have been experimentally investigated. A piece of home-made single mode PbSF fiber with enlarged refractive index difference between the fiber cladding and PbS nanoparticles doped fiber core is fabricated, exhibiting a mode field diameter of 7.9 μm which hence allows for intensified optical field confinement with respect to conventional SSMFs. Results show that the intensity of high order FSBS resonant peaks of PbSF is greater than that of SSMF by more than ten-fold enhancement. By increasing and decreasing the ambient temperature, it is confirmed that the PbSF-based FSBS sensor exhibits a temperature sensitivity of 78.38 kHz/℃ at the highest 19th order of FSBS acoustic resonance. In our experiments, a minimum temperature resolution of 0.20 ℃ at the 15th order of acoustic resonance was detected. These findings indicate that the utilization of PbSF, instead of SSMF, as the sensing element in FSBS-based sensors would be beneficial to achieve high-performance temperature measurement. © 2025 SPIE.

关键词： Stimulated Brillouin scattering

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A Continual Encrypted Traffic Classification Algorithm Based on WGAN 3

A Continual Encrypted Traffic Classification Algorithm Based...

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3rd International Seminar on Artificial Intelligence, Networking, and Information Technology, AINIT 2022

作者： Ma, Xiuli Zhu, Wenbin Jin, Yanliang Gao, Yuan Shanghai Institute for Advanced Communication and Data Science Shanghai University Shanghai China Shanghai University Shanghai China

ISBN: (数字)9781510662971

ISBN: (纸本)9781510662964

With the constant updating of applications and the emergence of various encryption technologies, a large amount of new encrypted network traffic is generated every day. Therefore, it is a challenging task to achieve continual learning of encrypted traffic. Existing encrypted traffic classification techniques can only handle a fixed number of traffic classes, which is not applicable to real network environments. In this paper, we proposed a continual encrypted traffic classification method based on WGAN, called CETC. The method takes advantage of the powerful data generation capabilities of WGAN to model the data distribution of encrypted traffic. When learning from a new traffic class, the samples from the old class is generated by WGAN to train the new classifier. We use the ISCX VPN-nonVPN dataset to test the performance of CETC. Experimental results show that WGAN can generate high-quality samples of encrypted traffic and the accuracy of CETC is higher than 93%. With its efficient and continual learning capability, CETC can be applied to various encrypted traffic detection and management systems. © 2023 SPIE.

关键词： Cryptography

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A Digital Twin and Consensus Empowered Cooperative Control Framework for Platoon-Based Autonomous Driving

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清华大学学报自然科学版（英文版） 2025年第3期30卷 1096-1111页

作者： Jiayu Cao Supeng Leng Kai Xiong Xiaosha Chen School of Information and Communication Engineering University of Electronic Science and Technology of ChinaChengdu 611731China Shenzhen Institute for Advanced Study University of Electronic Science and Technology of ChinaShenzhen 518110China College of Computer Science and Technology and also with College of Data Science Taiyuan University of TechnologyTaiyuan 030024China

Platoon-based autonomous driving is indispensable for traffic automation,but it confronts substantial constraints in rugged terrains with unreliable links and scarce communication *** paper proposes a novel hierarchical Digital Twin(DT)and consensus empowered cooperative control framework for safe driving in harsh ***,leveraging intra-platoon information exchange,one platoon-level DT is constructed on the leader and multiple vehicle-level DTs are distributed among platoon *** leader first makes critical platoon-driving decisions based on the platoon-level ***,considering the impact of unreliable links on the platoon-level DT accuracy and the consequent risk of unsafe decision-making,a distributed consensus scheme is proposed to negotiate critical decisions *** successful negotiation,vehicles proceed to execute critical decisions,relying on their vehicle-level ***,a Space-Air-Ground-Integrated-Network(SAGIN)enabled information exchange is utilized to update the platoon-level DT for subsequent safe decision-making in scenarios with unreliable links,no roadside units,and obstructed ***,based on this framework,an adaptive platooning scheme is designed to minimize total delay and ensure driving *** results indicate that our proposed scheme improves driving safety by 21.1％and reduces total delay by 24.2％in harsh areas compared with existing approaches.

关键词： platoon autonomous driving distributed consensus digital twin space-air-ground integrated network

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