A5033233282- Advanced Fiber Optic Sensors
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Optical Network Technologies
- Semiconductor Lasers and Optical Devices
- Advanced Photonic Communication Systems
- Analytical Chemistry and Sensors
- Mechanical and Optical Resonators
- Optical Wireless Communication Technologies
- Neural Networks and Reservoir Computing
- PAPR reduction in OFDM
- ZnO doping and properties
- Gas Sensing Nanomaterials and Sensors
- Optical Coherence Tomography Applications
- Advanced Optical Network Technologies
- Advanced Optical Sensing Technologies
- Advanced Photocatalysis Techniques
- Advanced Wireless Communication Techniques
- TiO2 Photocatalysis and Solar Cells
- Error Correcting Code Techniques
- Advanced Wireless Communication Technologies
- Advanced Memory and Neural Computing
- HVDC Systems and Fault Protection
- Conducting polymers and applications
- Spectroscopy Techniques in Biomedical and Chemical Research
Suzhou University of Science and Technology
2025
Suzhou City University
2025
Beijing University of Posts and Telecommunications
2012-2024
Changchun University of Science and Technology
2024
State Key Laboratory of Information Photonics and Optical Communications
2012-2024
Tsinghua University
2013-2024
Sun Yat-sen University
2023
Huazhong Agricultural University
2023
Citrus Research Institute
2023
Charité - Universitätsmedizin Berlin
2023
The distributed fibre sensing technology based on backward stimulated Brillouin scattering (BSBS) is experiencing a rapid development. However, all reported implementations of sensors until today are restricted to detecting physical parameters inside the core. On contrary, forward (FSBS), due its resonating transverse acoustic waves, being studied recently facilitate innovative detections in surroundings, opening domains that impossible with BSBS. Nevertheless, co-propagating behaviour pump...
Abstract Distributed optical fibre sensors deliver a map of physical quantity along an fibre, providing unique solution for health monitoring targeted structures. Considerable developments over recent years have pushed conventional distributed towards their ultimate performance, while any significant improvement demands substantial hardware overhead. Here, technique is proposed, encoding the interrogating light signal by single-sequence aperiodic code and spatially resolving information...
Systematic errors induced by distortions in the pump pulse of conventional Brillouin distributed fiber sensors are thoroughly investigated. Experimental results, supported a theoretical analysis, demonstrate that two probe sidebands standard optical time-domain analyzers provide non-zero net gain on pulse, inducing severe when scanning pump-probe frequency offset, especially at high power levels. Compared to impact non-local effects reported state-of-the-art, measurements here indicate for...
Commonly, the frequency shift of back-reflection spectra is key parameter to measure quantitatively local temperature or strain changes in frequency-scanned Rayleigh-based distributed fiber sensors. Cross correlation most common method estimate shift; however, large errors may take place, particularly when introduced by change applied beyond spectral width main peak. This fact substantially limits reliability system, and therefore requires careful analysis possible solutions. In this paper,...
FPGA can allow designers to produce hardware functions quickly in accordance with requirements. Because of its flexibility and parallel processing ability. It has been widely used image, signal other fields. Image saturation is an important standard describe image quality, which affects the color brightness visual perception image. At same time, enhancement, it part enhancing effects improving quality. Combined above two points, high-speed capability be carry out complex achieve purpose...
Targeted covalent inhibitors (TCIs) play an essential role in the fields of kinase research and drug discovery. Most existing TCIs are however cysteine‐ or lysine‐reactive, thus severely limiting their potential applications. New types capable covalently targeting other nucleophilic amino acids that readily available proteins urgently needed. We report herein a glyoxal‐based, arginine‐reactive strategy to generate potent selective small‐molecule Mcl‐1 (an important anti‐apoptotic protein) by...
The performance of post-processing techniques carried out on the Brillouin gain spectrum to estimate frequency shift (BFS) in standard distributed sensors is evaluated. Curve fitting methods with functions such as polynomial and Lorentzian, well correlation Lorentzian Cross-correlation Cross Reference Plot Analysis (CRPA), are considered for analysis. procedures key parameters each technique optimized, terms BFS uncertainty, offset error processing time compared by numerical simulations...
The performance of unipolar unicolor coded Brillouin optical time-domain analysis (BOTDA) is evaluated based on both Simplex and Golay codes.Four major detrimental factors that limit the system performance, including decoded-gain trace distortion, coding pulse power non-uniformity, polarization pulling higher-order non-local effects, are thoroughly investigated.Through theoretical an experimental validations, solutions optimal design conditions for BOTDA clearly established.First, a...
In this paper, a highly-sensitive distributed shape sensor based on multicore fiber (MCF) and phase-sensitive optical time-domain reflectometry (φ-OTDR) is proposed experimentally demonstrated. The implemented system features high strain sensitivity (down to ∼0.3 µɛ) over 24 m-long MCF with spatial resolution of 10 cm. results demonstrate good repeatability the relative curvature bend orientation measurements. Changes in are successfully retrieved, showing detectable displacements free...
The signal-to-noise ratio (SNR) of Brillouin optical time-domain analyzers (BOTDA) is modelled and experimentally validated, using direct detection with without the use pre-amplification. behavior SNR as a function gain probe power reaching photo analyzed in depth this developed model checked two photodetectors different specifications. It proves that pre-amplification associated to good-quality photodetector well-matched post-processing filtering can secure highest for direct-detection...
Distributed measurement of forward stimulated Brillouin scattering (FSBS) attracted substantial attention for its ability to probe media surrounding optical fibers. Currently, all techniques extract the information from FSBS-induced local energy transfer among distinct tones, this being fundamentally sensitive intensity perturbations imposed by nonlinear effects. Instead, here we propose FSBS measuring frequency shift a short pulse subject phase chirp modulation caused harmonic oscillation....
The robustness of bipolar pulse coding against pump depletion issues in Brillouin distributed fiber sensors is theoretically and experimentally investigated.The presented analysis points out that the effectiveness sensing can be highly affected by power unbalance between -1's + 1's elements resulting from amplification coded pulses.In order to increase those detrimental effects alleviate probe limitation imposed depletion, a technique using three-tone proposed.Experimental results...
A Brillouin optical time-domain analysis (BOTDA) method based on a closed-loop control system is proposed to track fast variations of the frequency shift along sensing fiber.While eliminates gain spectral scanning, exact distributed profile retrieved directly from output controller with no need postprocessing.Moreover, as operating being continuously updated follow change, an unlimited temperature or strain measurement range can be achieved.Both theoretical and experimental results validate...
The benefits and limitations inherent to the 2D postprocessing of measurements from Brillouin optical time-domain analyzers are investigated a fundamental point view. In preliminary step, impact curve fitting on precision estimated frequency shift is analyzed, enabling fair comparison between representative noise-reduction algorithms studied in this article. performances terms signal-to-noise ratio, experimental uncertainty σ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...
A Brillouin optical time-domain analysis (BOTDA) scheme based on hybrid amplification, consisting of a distributed Raman amplification and lumped provided by remotely pumped Erbium-doped fibers, is proposed thoroughly studied, enabling longest sensing distance among existing repeaterless techniques. First, the criteria for optimizing powers entering fiber are defined. Then, walk-off effect in forward associated self-phase modulation pointed out analyzed to describe BOTDA pulse distortion its...
A distributed and dynamic strain sensing system based on frequency-scanning phase-sensitive optical time domain reflectometry is proposed demonstrated. By utilizing an RF pulse scheme with a fast arbitrary waveform generator, train of pulses covering large range different frequencies, short width, high extinction ratio generated. Also, Rayleigh-enhanced fiber used to eliminate the need for averaging, allowing single-shot operation. Using direct detection harnessing dedicated least mean...
In this paper, a long-distance distributed pressure sensing system based on special fiber and using frequency-scanned phase-sensitive optical time-domain reflectometry is proposed. The shows high sensitivity (159 MHz/bar) low loss (3 dB/km) owing to its simple structure made of two large air holes in the cladding. response orthogonal polarization axes explored distinctively. Distributed over long range (720 m) spatial resolution (5 cm) demonstrated, resulting 14,400 resolved points with...
A novel, to the best of our knowledge, postprocessing technique is proposed extract with a flexible and variable spatial resolution information from Brillouin optical time-domain analyzers, obtained using pulse longer than acoustic settling time. The negative impact transient effect suppressed, enabling response proportional gain spectrum keeping its natural linewidth. This leads better overall sensing performance, in particular for submetric resolutions, no compromises on range measurement
The real-time CCDM and inverse were realized in an FPGA. DM achieved a throughput of 16.8GBaud supported on-line reconfiguration to realize different entropies with fine granularity.
Noise models for both single-pulse and coded Brillouin optical time-domain analyzers (BOTDA) are established to quantify the actual signal-to-noise ratio (SNR) enhancement provided by pulse coding at any fiber position in operating condition. Simulation experimental results show that polarization noise spontaneous scattering (SpBS) signal beating could highly penalize performance of coded-BOTDA, depending on code type interrogated position. The also serve as a useful tool optimize SNR...