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Distributed phase-matching measurement for dynamic strain and temperature sensing based on stimulated Brillouin scattering enhanced four-wave mixing 被引量:2
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作者 YUAN WANG PEDRO TOVAR +2 位作者 JUNTONG YANG LIANG CHEN xiaoyi bao 《Photonics Research》 SCIE EI CAS CSCD 2024年第1期141-153,共13页
A Brillouin dynamic grating(BDG) can be used for distributed birefringence measurement in optical fibers,offering high sensitivity and spatial resolution for sensing applications.However,it is quite a challenge to sim... A Brillouin dynamic grating(BDG) can be used for distributed birefringence measurement in optical fibers,offering high sensitivity and spatial resolution for sensing applications.However,it is quite a challenge to simultaneously achieve dynamic measurements with both high accuracy and high spatial resolution.In this work,we propose a sensing mechanism to achieve distributed phase-matching measurement using a chirped pulse as a probe signal.In BDG reflection,the peak reflection corresponds to the highest four-wave mixing(FWM) conversion efficiency,and it requires the Brillouin frequency in the fast and slow axes to be equal,which is called the phase-matching condition.This condition changes at different fiber positions,which requires a range of frequency injection for the probe wave.The proposed method uses a chirped pulse as a probe wave to cover this frequency range associated with distributed birefringence inhomogeneity.This allows us to detect distributed phase matching for birefringence changes that are introduced by temperature and strain variations.Thanks to the single shot and direct time delay measurement capability,the acquisition rate in our system is only limited by the fiber length.Notably,unlike conventional BDG spectrum recovery-based systems,the spatial resolution here is determined by both the frequency chirping rate of the probe pulse and the birefringence profile of the fiber.In the experiments,an acquisition rate of 1 k Hz(up to fiber length limits) and a spatial resolution of 10 cm using a 20 ns probe pulse width are achieved.The minimum detectable temperature and strain variation are 5.6 mK and 0.37 με along a 2 km long polarization-maintaining fiber(PMF). 展开更多
关键词 FIBER SCATTERING POLARIZATION
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Unveiling optical rogue wave behavior with temporally localized structures in Brillouin random fiber laser comb
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作者 Yuxi Pang Qiang Ji +6 位作者 Shaonian Ma Xian Zhao Zengguang Qin Zhaojun Liu Ping Lu xiaoyi bao Yanping Xu 《Advanced Photonics Nexus》 2024年第2期59-74,共16页
The optical rogue wave(RW),known as a short-lived extraordinarily high amplitude dynamics phenomenon with small appearing probabilities,plays an important role in revealing and understanding the fundamental physics of... The optical rogue wave(RW),known as a short-lived extraordinarily high amplitude dynamics phenomenon with small appearing probabilities,plays an important role in revealing and understanding the fundamental physics of nonlinear wave propagations in optical systems.The random fiber laser(RFL),featured with cavity-free and“modeless”structure,has opened up new avenues for fundamental physics research and potential practical applications combining nonlinear optics and laser physics.Here,the extreme event of optical RW induced by noise-driven modulation instability that interacts with the cascaded stimulated Brillouin scattering,the quasi-phase-matched four-wave mixing as well as the random mode resonance process is observed in a Brillouin random fiber laser comb(BRFLC).Temporal and statistical characteristics of the RWs concerning their emergence and evolution are experimentally explored and analyzed.Specifically,temporally localized structures with high intensities including chair-like pulses with a sharp leading edge followed by a trailing plateau appear frequently in the BRFLC output,which can evolve to chair-like RW pulses with adjustable pulse duration and amplitude under controlled conditions.This investigation provides a deep insight into the extreme event of RWs and paves the way for RW manipulation for its generation and elimination in RFLs through adapted laser configuration. 展开更多
关键词 optical rogue wave modulation instability random fiber laser cascaded stimulated Brillouin scattering four-wave mixing temporally localized structure
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Single-shot BOTDA based on an optical chirp chain probe wave for distributed ultrafast measurement 被引量:17
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作者 Dengwang Zhou Yongkang Dong +6 位作者 Benzhang Wang Chao Pang Dexin Ba Hongying Zhang Zhiwei Lu Hui Li xiaoyi bao 《Light(Science & Applications)》 SCIE EI CAS CSCD 2018年第1期718-728,共11页
Brillouin optical time-domain analysis(BOTDA)requires frequency mapping of the Brillouin spectrum to obtain environmental information(e.g.,temperature or strain)over the length of the sensing fiber,with the finite fre... Brillouin optical time-domain analysis(BOTDA)requires frequency mapping of the Brillouin spectrum to obtain environmental information(e.g.,temperature or strain)over the length of the sensing fiber,with the finite frequencysweeping time-limiting applications to only static or slowly varying strain or temperature environments.To solve this problem,we propose the use of an optical chirp chain probe wave to remove the requirement of frequency sweeping for the Brillouin spectrum,which enables distributed ultrafast strain measurement with a single pump pulse.The optical chirp chain is generated using a frequency-agile technique via a fast-frequency-changing microwave,which covers a larger frequency range around the Stokes frequency relative to the pump wave,so that a distributed Brillouin gain spectrum along the fiber is realized.Dynamic strain measurements for periodic mechanical vibration,mechanical shock,and a switch event are demonstrated at sampling rates of 25 kHz,2.5 MHz and 6.25 MHz,respectively.To the best of our knowledge,this is the first demonstration of distributed Brillouin strain sensing with a wide-dynamic range at a sampling rate of up to the MHz level. 展开更多
关键词 OPTICAL PUMP WAVE
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Distributed static and dynamic detection of an acoustic wave in a Brillouin random fiber laser 被引量:2
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作者 ZICHAO ZHOU HAIYANG WANG +2 位作者 YUAN WANG LIANG CHEN xiaoyi bao 《Photonics Research》 SCIE EI CAS CSCD 2021年第5期772-780,共9页
The interaction of random laser and gain medium is important to understand the noise origin in random fiber lasers. Here, using the optical time domain reflectometry method, the time-resolved distributed acoustic wave... The interaction of random laser and gain medium is important to understand the noise origin in random fiber lasers. Here, using the optical time domain reflectometry method, the time-resolved distributed acoustic wave generated by a Brillouin random fiber laser(BRFL) is characterized. The dynamic property of the acoustic wave reflects the gain dynamics of the BRFL. The principle is based on the polarization-decoupled stimulated Brillouin scattering(SBS)-enhanced four-wave mixing process, where the probe light experiences maximum reflection when the phase match condition is satisfied. Static measurements present exponentially depleted Brillouin gain along the gain medium in the BRFL, indicating the localized random SBS frequency change in the maximum local gain region, which varies with time to contribute random laser noise as revealed in the dynamic measurement. The SBS-induced birefringence change in the Brillouin gain fiber is approximately 10^(-7) to 10^(-6). The phase noise of the BRFL is observed directly inside the random laser gain medium for the first time via time and spatially varied acoustic wave intensity. By counting the temporal intensity statistical distribution, optical rogue waves are detected near the lasing threshold of the BRFL. Different temporal intensity statistical distribution at high and low gain positions is found, which is caused by the SBS nonlinear transfer function and localized gain. The distributed characterization methods in the paper provide a new platform to study the interaction of random lasers and gain medium, giving us a new perspective to understand the fundamental physics of the random lasing process and its noise property. 展开更多
关键词 FIBER POLARIZATION RANDOM
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Effects of polarization on stimulated Brillouin scattering in a birefringent optical fiber 被引量:2
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作者 Daisy Williams xiaoyi bao Liang Chen 《Photonics Research》 SCIE EI CAS 2014年第5期126-137,共12页
The most general model of elliptical birefringence in an optical fiber has been developed for a steady-state and transient stimulated Brillouin scattering interaction.The impact of the elliptical birefringence is to i... The most general model of elliptical birefringence in an optical fiber has been developed for a steady-state and transient stimulated Brillouin scattering interaction.The impact of the elliptical birefringence is to induce a Brillouin frequency shift and distort the Brillouin spectrum—which varies with different light polarizations and pulsewidths.The model investigates the effects of birefringence and the corresponding evolution of spectral distortion effects along the fiber,providing a valuable prediction tool for distributed sensing applications. 展开更多
关键词 POLARIZATION FIBER SCATTERING
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Non-destructive and distributed measurement of optical fiber diameter with nanometer resolution based on coherent forward stimulated Brillouin scattering 被引量:3
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作者 Zijie Hua Dexin Ba +4 位作者 Dengwang Zhou Yijia Li Yue Wang xiaoyi bao Yongkang Dong 《Light(Advanced Manufacturing)》 2021年第4期1-12,共12页
Precise control and measurement of the optical fiber diameter are vital for a range of fields,such as ultra-high sensitivity sensing and high-speed optical communication.Nowadays,the measurement of fiber diameter reli... Precise control and measurement of the optical fiber diameter are vital for a range of fields,such as ultra-high sensitivity sensing and high-speed optical communication.Nowadays,the measurement of fiber diameter relies on point measurement schemes such as microscopes,which suffer from a tradeoff between the resolution and field of view.Handling the fiber can irreversibly damage the fiber samples,especially when multi-point measurements are required.To overcome these problems,we have explored a novel technique in which the mechanical properties of fibers are reflected by forward stimulated Brillouin scattering(FSBS),from which the diameters can be demodulated via the acoustic dispersion relation.The distributed FSBS spectra with narrow linewidths were recorded via the optimized optomechanical time-domain analysis system using coherent FSBS,thereby achieving a spatial resolution of 1 m over a fiber length of tens of meters.We successfully obtained the diameter distribution of unjacketed test fibers with diameters of 125μm and 80μm.The diameter accuracy was verified by high-quality scanning electron microscope images.We achieved a diameter resolution of 3.9 nm,virtually independent of the diameter range.To the best of our knowledge,this is the first demonstration of non-destructive and distributed fiber diameter monitoring with nanometer resolution. 展开更多
关键词 fiber SCATTERING resolution
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Improved all-optical OR logic gate based on combined Brillouin gain and loss in an optical fiber 被引量:1
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作者 Daisy Williams xiaoyi bao Liang Chen 《Chinese Optics Letters》 SCIE EI CAS CSCD 2014年第8期68-71,共4页
Improved all-optical OR gates are proposed, using a novel fiber nonlinearity-based technique, based on the principles of combined Brillouin gain and loss in a polarization-maintaining fiber (PMF). Switching contrast... Improved all-optical OR gates are proposed, using a novel fiber nonlinearity-based technique, based on the principles of combined Brillouin gain and loss in a polarization-maintaining fiber (PMF). Switching contrasts are simulated to be between 82.4%-83.6%, for two respective configurations, and switching time is comparable to the phonon relaxation time in stimulated Brillouin scattering (SBS). 展开更多
关键词 NAND ASW Improved all-optical OR logic gate based on combined Brillouin gain and loss in an optical fiber
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Characterization of high nonlinearity in Brillouin amplification in optical fibers with applications in fiber sensing and photonic logic 被引量:1
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作者 Daisy Williams xiaoyi bao Liang Chen 《Photonics Research》 SCIE EI CAS 2014年第1期1-9,共9页
A highly accurate,fully analytic solution for the continuous wave and the probe wave in Brillouin amplification,in lossless optical fibers,is given.It is experimentally confirmed that the reported analytic solution ca... A highly accurate,fully analytic solution for the continuous wave and the probe wave in Brillouin amplification,in lossless optical fibers,is given.It is experimentally confirmed that the reported analytic solution can account for spectral distortion and pump depletion in the parameter space that is relevant to Brillouin fiber sensor applications,as well as applications in photonic logic.The analytic solutions are valid characterizations of Brillouin amplification in both the low and high nonlinearity regime,for short fiber lengths. 展开更多
关键词 fiber optical PUMP
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Investigation of combined Brillouin gain and loss in a birefringent fiber with applications in sensing 被引量:2
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作者 Daisy Williams xiaoyi bao Liang Chen 《Chinese Optics Letters》 SCIE EI CAS CSCD 2014年第12期126-132,共7页
The most general model of elliptical birefringence in an optical fiber is extended to describe a transient Bril-louin interaction including both gain and loss. The effects of elliptical birefringence cause a Brillouin... The most general model of elliptical birefringence in an optical fiber is extended to describe a transient Bril-louin interaction including both gain and loss. The effects of elliptical birefringence cause a Brillouin spectral shape distortion, which is detrimental for fiber sensing techniques. The model investigates the effects of bire- fringence and the corresponding evolution of spectral distortion effects along the fiber, and also investigates regimes where this distortion is minimal. 展开更多
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Dispersion Effects of High-Order-Mode Fiber on Temperature and Axial Strain Discrimination
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作者 Yanping XU Ping LU +3 位作者 Jia SONG Liang CHEN xiaoyi bao Xiaopeng DONG 《Photonic Sensors》 SCIE EI CAS CSCD 2015年第3期224-234,共11页
A new approach utilizing effects of dispersion in the high-order-mode fibers (HOMFs) to effectively discriminate changes in environmental temperature and axial strain is proposed and experimentally demonstrated. Exp... A new approach utilizing effects of dispersion in the high-order-mode fibers (HOMFs) to effectively discriminate changes in environmental temperature and axial strain is proposed and experimentally demonstrated. Experimental characterization of a HOMF-based fiber modal interferometer with a sandwich fiber structure exhibits excellent agreements with numerical simulation results. A Fourier transform method of interferometry in the spatial frequency domain is adopted to distinguish mode coupling between different core-guided modes. Distinct phase sensitivities of multiple dispersion peaks are extracted by employing a novel phase demodulation scheme to realize dual-parameter sensing. 展开更多
关键词 Optical fiber sensor temperature and strain discrimination DISPERSION
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