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Characterization and tailoring of statistical properties of erbium-doped random fiber lasers

Chinese Optics Letters 2024年第12期22卷 63-69页

作者： Xingyu Bao Shengtao Lin Jiaojiao Zhang Longqun Ni Yifei Qi Anchi Wan Zinan Wang Key Laboratory of Optical Fiber Sensing and Communications University of Electronic Science and Technology of ChinaChengdu 611731China

Statistical properties of the erbium-doped random fiber laser(ERFL)play an important role in studying its physical attributes and advancing profound ***,there is an obvious need for thorough characterization and effective ***,we investigate the full-bandwidth time-domain statistical properties of ERFL and achieve its tailoring through the aspect of fiber ***,a narrowband ERFL is delicately designed to guarantee full-bandwidth *** intensity probability density function(PDF)employed to analyze time-domain characteristics exhibits an inward deviation from the exponential distribution,indicating that correlations exist among different wavelength ***,the effect of fiber dispersion on the temporal characteristics of ERFL is *** results demonstrate that dispersion accumulation breaks correlations among wavelength components,making its time-domain characteristics closer to the amplified spontaneous emission ***,dispersion compensation makes the PDF distribution converge further,leading to a more stable temporal output compared to the ERFL seed *** work reveals the intrinsic time-domain dynamics of ERFL and provides new insights into tailoring demand-oriented temporal characteristics.

关键词： erbium-doped random fiber laser time-domain statistical properties fiber dispersion

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Temporal-spectral correlation dynamics of Raman random fiber laser

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Science China(Information Sciences) 2025年第4期68卷 166-176页

作者： Longqun NI Yifei QI Xingyu BAO Jing ZHANG Pan WANG Han WU Zinan WANG Key Laboratory of Optical Fiber Sensing and Communications University of Electronic Science and Technology of China College of Electronics and Information Engineering Sichuan University

Raman random fiber laser(RRFL) possesses rich physical properties of spectral, temporal, and spatial domains due to its unique feedback mechanism and complex nonlinear effects. Characterizing and controlling the microscopic evolution dynamics of RRFL are crucial to driving breakthrough advances in fields such as inertial confinement fusion and fundamental physics. In this work, a novel experimental and theoretical analysis of the evolution of the temporal spectral correlations of the RRFL in the transition and steady states is conducted. In the transitional state, the microscopic dynamics of the RRFL excitation process is revealed comprehensively: the temporal-correlation growth curve contrasts with that of resonant-cavity lasers, and the formation and degradation of spectral correlation are observed. In the steady state, the overall spectrum is characterized by partial correlation, and the correlation characteristics of RRFL mainly originate from the spectral random spikes, which offers a novel dimension for the precise control of RRFL correlation. This work provides new insights into underlying physical properties of continuous broadband lasers, offering key guidance for laser design, control, and applications.

关键词： random fiber laser microscopic characteristics temporal-spectral correlation random spikes nonlinear optics

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Free-moving-state microscopic imaging of cerebral oxygenation and hemodynamics with a photoacoustic fiberscope

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Light(Science & Applications) 2024年第1期13卷 33-46页

作者： Xiaoxuan Zhong Yizhi Liang Xiaoyu Wang Haoying Lan Xue Bai Long Jin Bai-Ou Guan Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics TechnologyJinan UniversityGuangzhou510632China

We report the development of a head-mounted photoacoustic fiberscope for cerebral imaging in a freely behaving *** 4.5-gram imaging probe has a 9-µm lateral resolution and 0.2-Hz frame rate over a 1.2-mm wide *** probe can continuously monitor cerebral oxygenation and hemodynamic responses at single-vessel resolution,showing significantly different cerebrovascular responses to external stimuli under anesthesia and in the freely moving *** example,when subjected to high-concentration CO_(2) respiration,enhanced oxygenation to compensate for hypercapnia can be visualized due to cerebral regulation in the freely moving *** studies exhibit significantly weakened compensation capabilities in obese *** new imaging modality can be used for investigating both normal and pathological cerebrovascular functions and shows great promise for studying cerebral activity,disorders and their treatments.

关键词： cerebral anesthesia moving

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Experiments and simulation on the overall DMG of long-haul cascade FM-EDFA systems

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Chinese Optics Letters 2024年第4期22卷 53-59页

作者：江歆睿武保剑严伟文峰邱昆 Key Laboratory of Optical Fiber Sensing and Communications Ministry of EducationUniversity of Electronic Science and Technology of ChinaChengdu 611731China

All-fiber few-mode erbium-doped fiber amplifiers(FM-EDFAs) with isolation and wavelength division multiplexers(IWDMs)have been developed to enable flexible pumping in different directions. The FM-EDFA can achieve >30 d B modal gain with<0.3 d B differential modal gain(DMG). We experimentally simulate the DMG performance of a cascade FM-EDFA system using the equivalent spectrum method. The overall DMG reaches 1.84 d B after 10-stage amplification. We also build a recirculating loop to simulate the system, and the developed FM-EDFA can support transmission up to 3270 km within a 2 d B overall DMG by optimizing the few-mode fiber length in the loop.

关键词： mode division multiplexing few-mode erbium-doped fiber amplifier gain equalization

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Research and analysis of Brillouin distributed sensing system based on quasi-single-mode few-mode fiber

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Optoelectronics Letters 2024年第1期20卷 7-11页

作者： LI Yongqian LIU Zijuan ZHANG Lixin TIAN Min FAN Haijun Department of Electronic and Communication Engineering North China Electric Power UniversityBaoding 071003China Hebei Key Laboratory of Power Internet of Things Technology North China Electric Power UniversityBaoding 071003China Baoding Key Laboratory of Optical Fiber Sensing and Optical Communication Technology North China Electric Power UniversityBaoding 071003China

A distributed fiber sensor was fabricated by splicing two single-mode fibers(SMFs)using the few-mode fiber(FMF)technique.A Brillouin optical time domain analysis(BOTDA)system was developed to measure the sensor’s temperature and bending ***-mode and four-mode step FMFs were combined to splice the few-mode *** results indicate that the temperature response coefficients of the few-mode segment are only slightly higher than those of the connected single-mode segment,measuring at 1.13 MHz/℃and 1.12 MHz/℃,*** minimum bending radius for the sensor is 0.9 cm,and the four-mode bending response curve is superior to that of the two-mode one,proving that 4-SI-FMF offers better bending sensitivity.

关键词： fiber technique mode

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Thermal locking-based optical parametric oscillation: noise suppression in a WGM cavity

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Optics Letters 2025年第11期50卷 3596-3599页

作者： Han, Xinjie Geng, Yong Qiu, Kun Zhou, Heng Key Lab of Optical Fiber Sensing and Communication Networks School of Information and Communication Engineering University of Electronic Science and Technology of China Chengdu611731 China

We propose a frequency stabilization system based on thermal locking, utilizing the thermo-optic effect in a whispering gallery mode (WGM) resonator. By coupling the WGM resonator with an ultra-stable laser, low-frequency noise can be stably suppressed. Additionally, through intracavity optical parametric oscillation, this noise suppression is effectively extended to multiple wavelengths, achieving frequency noise levels of 0.71 Hz2/Hz at 10 Hz and 39 Hz2/Hz at 1 Hz. This approach eliminates conventional proportional-integral-derivative feedback loops, bypasses the optoelectronic conversion, and enables low-frequency thermal noise locking entirely within the optical domain. This method streamlines the system architecture, reduces energy consumption, and offers a robust solution for high-precision frequency stabilization across a broad spectral range. © 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： Femtosecond lasers Frequency combs Laser resonators Laser systems Variable optical attenuators Whispering gallery modes

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Spatiotemporal pulse weaving scalar optical hopfions

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Light(Science & Applications) 2023年第3期12卷 325-326页

作者： Chenhui Li Sicong Wang Xiangping Li Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics TechnologyJinan UniversityGuangzhouChina

Scalar optical hopfions weaved by nested equiphase lines in the shape of a toroidal vortex are theoretically designed and experimentally *** category of hopfions manifesting as a spatiotemporally structured pulse propagating in space-time may enable encoding and transferring optical topological information in an additional(temporal)dimension.

关键词： pulse optical enable

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Influence of laser wavelength instability,polarization fading and phase fluctuation on local heterodyne detection wavelength scanning BOTDR

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Optoelectronics Letters 2023年第4期19卷 200-204页

作者： LI Yongqian WANG Lei FAN Haijun Department of Electronic and Communication Engineering North China Electric Power UniversityBaoding 071003China Hebei Key Laboratory of Power Internet of Things Technology North China Electric Power UniversityBaoding 071003China Baoding Key Laboratory of Optical Fiber Sensing and Optical Communication Technology North China Electric Power UniversityBaoding 071003China

In this paper,the influence of laser wavelength instability,polarization fading and phase fluctuation on local heterodyne detection wavelength scanning Brillouin optical time domain reflectometer(WS-BOTDR)is theoretically analyzed,and a local heterodyne detection WS-BOTDR system is built for experimental *** experimental results show that with the increase of sensing distance,the adverse effect of laser wavelength instability,polarization fading and phase fluctuation on local heterodyne detection WS-BOTDR is gradually aggravated,which will lead to the broadening and distortion of the wavelength power spectrum(WPS),resulting in large errors in demodulated Brillouin central wavelength(BCW)and *** average temperature measurement errors at the positions of 1 km,5 km,9 km non-heating section and 9.45 km heating section are 1.76℃,3.42℃,3.89℃and 4.3℃,respectively.

关键词： polarization BOTDR local

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Analysis of the Influence of fiber Winding on the Performance of Interferometric fiber-Optic Accelerometer based on Spring-mass Structure

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IEEE Sensors Journal 2025年第12期25卷 21370-21376页

作者： Hu, Jincheng Li, Shuangshuang Chen, Fengyi Wang, Ruohui Qiao, Xueguang Northwest University Fiber Optic Sensors Laboratory and School of Physics Xi’an710127 China Universities of Shaanxi Province Xi’an Key Laboratory of Optical Fiber Sensing Technology for Underground Resources Engineering Research Center of Optical Fiber Well Logging Technology for Oil and Gas Resources Xi’an710127 China

In this paper, we theoretically and experimentally analyze the influence of fiber winding on the performance of an interferometric fiber-optic accelerometer. The working principle of the fiber-optic accelerometer, based on a spring-mass structure, is presented. Both theoretical analysis and experimental results indicate that increasing the number of turns in the fiber enhances the sensitivity and the resonant frequency of the sensor simultaneously. The highest sensitivity of the sensor is 112 rad/g, while the resonant frequency is 814 Hz. Additionally, we used finite-element analysis to predict the sensitivity of the multi-layer fiber-winding accelerometer. The error between the sensitivity of the two prototype sensors and the simulated sensitivity is less than 5%. The amplitude-frequency response experiment results show that for a constant sensing fiber length, the resonance frequency of the multi-layer winding accelerometer increases, while the sensitivity decreases compared to the single-layer winding accelerometer. The analysis presented in this paper has guiding significance for the performance optimization of interferometric fiber-optic accelerometers. © 2001-2012 IEEE.

关键词： Accelerometers

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Physical Layer Encryption of OFDM-PON Based on Quantum Noise Stream Cipher with Polar Code

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China communications 2024年第3期21卷 174-188页

作者： Xu Yinbo Gao Mingyi Zhu Huaqing Chen Bowen Xiang Lian Shen Gangxiang Jiangsu Engineering Research Center of Novel Optical Fiber Technology and Communication Network Suzhou Key Laboratory of Advanced Optical Communication Network Technologythe School of Electronic and Information EngineeringSoochow UniversityNo.1 Shizi StreetSuzhou 215006China

Orthogonal frequency division multiplexing passive optical network(OFDM-PON) has superior anti-dispersion property to operate in the C-band of fiber for increased optical power budget. However,the downlink broadcast exposes the physical layer vulnerable to the threat of illegal eavesdropping. Quantum noise stream cipher(QNSC) is a classic physical layer encryption method and well compatible with the OFDM-PON. Meanwhile, it is indispensable to exploit forward error correction(FEC) to control errors in data transmission. However, when QNSC and FEC are jointly coded, the redundant information becomes heavier and thus the code rate of the transmitted signal will be largely reduced. In this work, we propose a physical layer encryption scheme based on polar-code-assisted QNSC. In order to improve the code rate and security of the transmitted signal, we exploit chaotic sequences to yield the redundant bits and utilize the redundant information of the polar code to generate the higher-order encrypted signal in the QNSC scheme with the operation of the *** experimentally demonstrate the encrypted 16/64-QAM, 16/256-QAM, 16/1024-QAM, 16/4096-QAM QNSC signals transmitted over 30-km standard single mode fiber. For the transmitted 16/4096-QAM QNSC signal, compared with the conventional QNSC method, the proposed method increases the code rate from 0.1 to 0.32 with enhanced security.

关键词： physical layer encryption polar code quantum noise stream cipher

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