A5013238882- Advanced Fiber Optic Sensors
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Optical Network Technologies
- Semiconductor Lasers and Optical Devices
- Mechanical and Optical Resonators
- Advanced Photonic Communication Systems
- Photonic Crystal and Fiber Optics
- Optical Coherence Tomography Applications
- Analytical Chemistry and Sensors
- Photoacoustic and Ultrasonic Imaging
- Advanced Optical Network Technologies
- Advanced Optical Sensing Technologies
- Advanced Surface Polishing Techniques
- Seismic Waves and Analysis
- Optical Wireless Communication Technologies
- Advanced machining processes and optimization
- Synthetic Organic Chemistry Methods
- Organometallic Complex Synthesis and Catalysis
- Spectroscopy and Laser Applications
- Geophysics and Sensor Technology
- Adhesion, Friction, and Surface Interactions
- Icing and De-icing Technologies
- Spectroscopy Techniques in Biomedical and Chemical Research
- Advanced MEMS and NEMS Technologies
Federico Santa María Technical University
2009-2025
Guangzhou University
2018-2022
École Polytechnique Fédérale de Lausanne
2012-2021
Guangzhou Experimental Station
2021
Universidad Técnica Federico Santa María
2021
Tel Aviv University
2019
Universidad de Alcalá
2019
Bar-Ilan University
2019
Sensors (United States)
2018
Nanjing University
2018
A thorough analysis of the key factors impacting on performance Brillouin distributed optical fiber sensors is presented. An analytical expression derived to estimate error determination peak gain frequency, based for first time real experimental conditions. This experimentally validated, and describes how this frequency uncertainty depends measurement parameters, such as linewidth, scanning step signal-to-noise ratio. Based model leading considering limitations imposed by nonlinear effects...
Abstract Distributed optical fibre sensors possess the unique capability of measuring spatial and temporal map environmental quantities that can be great interest for several field applications. Although existing methods performance enhancement have enabled important progresses in field, they do not take full advantage all information present measured data, still giving room substantial improvement over state-of-the-art. Here we propose experimentally demonstrate an approach exploits high...
Sinc-shaped Nyquist pulses possess a rectangular spectrum, enabling data to be encoded in minimum spectral bandwidth and satisfying by essence the criterion of zero inter-symbol interference (ISI). This property makes them very attractive for communication systems since transmission rates can maximized while usage is minimized. However, most pulse-shaping methods reported so far have remained rather complex none has led ideal sinc pulses. Here method produce sinc-shaped high quality proposed...
A theoretical and experimental study on the response of Brillouin scattering in multi-core optical fibers (MCF) under different curving conditions is presented. Results demonstrate that frequency shift off-center cores MCF highly bending-dependent, showing a linear dependence fiber curvature. This feature here exploited to develop new kind distributed sensor, which provides measurements profile mapping longitudinal shape. Using conventional time-domain analysis with differential pulse-width...
Continuous, real-time monitoring of surface seismic activity around the globe is great interest for acquiring new insight into global tomography analyses and recognition patterns leading to potentially hazardous situations. The already-existing telecommunication fiber optic network arises as an ideal solution this application, owing its ubiquity capacity optical fibers perform distributed, highly sensitive vibrations at relatively low cost (ultra-high density point sensors available with...
In this Letter, we propose the use of optical pulse coding techniques for long-range distributed sensors based on Brillouin time-domain analysis (BOTDA). Compared to conventional BOTDA sensors, provides a significant sensing-range enhancement, allowing temperature and strain measurements with 1 m spatial resolution over 50 km standard single-mode fiber, an accuracy 2.2 degrees C/44 muepsilon, respectively.
Distributed fiber sensing possesses the unique ability to measure distributed profile of an environmental quantity along many tens kilometers with spatial resolutions in meter or even centimeter scale. This feature enables sensors provide a large number resolved points using single optical fiber. However, current systems, this has remained constrained few hundreds thousands due finite signal-to-noise ratio (SNR) measurements, which imposes significant challenges development more performing...
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...
Modulation instability is thoroughly investigated and a simple analytical model for its power critically modifying the wave properties in terms of system parameters derived experimentally validated. The differences on modulation gain spectrum lossless lossy optical fibers are analyzed based theoretical models numerical simulations. In particular impact background noise behavior studied analytically verified by measurements proposed validated monitoring propagation along an fiber using...
The real remoteness of a distributed optical fiber sensor based on Brillouin time-domain analysis is considerably extended in this paper using seeded second-order Raman amplification and pulse coding. presented the experimental results demonstrate that proper optimization both methods combined with well-equalized two-sideband probe wave provide suitable solution to enhance signal-to-noise ratio measurements when an ultra-long sensing used. In particular, implemented system length, which half...
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...
In this paper, deep learning models trained with real seismic data are proposed and proven to detect earthquakes in fiber-optic distributed acoustic sensor (DAS) measurements. The neural network architectures cover the three classical paradigms: fully connected artificial networks (FC-ANNs), convolutional (CNNs) recurrent (RNNs). Results demonstrate that training these waveforms measured by traditional broadband seismometers can extract learn relevant features of earthquakes, enabling...
Abstract This Technical Design Report presents a detailed description of all aspects the LUXE (Laser Und XFEL Experiment), an experiment that will combine high-quality and high-energy electron beam European with high-intensity laser, to explore uncharted terrain strong-field quantum electrodynamics characterised by both high energy intensity, reaching Schwinger field beyond. The further implications for search physics beyond Standard Model are also discussed.
In this Letter, we combine the use of optical preamplification at receiver and pulse coding techniques with an optimized modulation format to effectively extend sensing range Brillouin time-domain analysis (BOTDA) sensors. Combining a return-to-zero 25% duty cycle linear gain allows for temperature strain measurements over 120 km standard single-mode fiber 3 m spatial resolution rms strain-temperature accuracy 3.1 °C/60 με respectively.
The behaviour of distributed temperature sensors based on spontaneous Raman scattering and coded OTDR (optical time domain reflectometry) is studied both theoretically experimentally; in particular a high performance scheme has been implemented using amplitude modulation according to Simplex coding, direct detection additional use lumped amplification further extend the sensing range.An efficient cost-effective system operating along 30 km dispersion-shifted fibre with 17 m spatial...
We experimentally investigate the benefits of a new optical pulse coding technique for long-range, meter and submeter scale Raman-based distributed temperature sensing on standard single-mode fibers. The proposed scheme combines low-repetition-rate quasi-periodic with use high-power fiber lasers operating at 1550 nm, allowing what we believe is first long-range measurement over fibers (SMFs). have achieved 1 m spatial resolution 26 km SMF, attaining 3°C within 30 s time.
In this paper we perform an optimization of Brillouin optical time-domain analysis (BOTDA) sensors for achieving high resolution over long sensing ranges using distributed Raman amplification. By employing optimized first-order bi-directional amplification scheme and combining high-power fiber-Raman lasers Fabry-Pérot with low relative-intensity-noise (RIN), demonstrate 120 km standard single-mode fiber 2 meter spatial a strain/temperature accuracy 45με/2.1°C respectively.
A method based on coherent Rayleigh scattering distinctly evaluating temperature and strain is proposed experimentally demonstrated for distributed optical fiber sensing.Combining conventional phase-sensitive time-domain domain reflectometry (φOTDR) φOTDR-based birefringence measurements, independent profiles are obtained along a polarization-maintaining fiber.A theoretical analysis, supported by experimental data, indicates that the system temperature-strain discrimination intrinsically...
In this paper a technique to measure the distributed birefringence profile along optical fibers is proposed and experimentally validated.The method based on spectral correlation between two sets of orthogonally-polarized measurements acquired using phase-sensitive time-domain reflectometer (φOTDR).The measured spectra gives resonance (correlation) peak at frequency detuning that proportional local refractive index difference orthogonal polarization axes fiber.In way enables phase any...
Distributed acoustic sensors (DAS) can monitor mechanical vibrations along thousands independent locations using an optical fibre. The measured waveform highly varies the sensing fibre due to intrinsic uneven DAS longitudinal response and distortions originated during wave propagation. Here, we propose a fully blind method based on near-field array processing that considers nonuniform of channels be used with any positioning geometry having angular diversity. With no source location...
A theoretical and experimental analysis of the impact pulse modulation format on Brillouin optical time-domain (BOTDA) sensors using coding techniques has been carried out.Pulse with conventional non-return-to-zero (NRZ) is shown to induce significant distortions in measured gain spectrum (BGS), especially proximity abrupt changes fiber spectra.Such an effect, as confirmed by analysis, due acoustic wave pre-excitation non-uniform which depends bit patterns defined different codewords.A...
A pump signal based on bipolar pulse coding and single-sideband suppressed-carried (SSB-SC) modulation is proposed for Brillouin optical time-domain analysis (BOTDA) sensors. Making a sequential use of the gain loss spectra, technique experimentally validated using complementary-correlation Golay codes along 100 km-long fiber 2 m spatial resolution, fully resolving hot-spot at end sensing with no distortion introduced by decoding algorithm. Experimental results, in good agreement theory,...
Bidirectional low-noise Raman amplification and simplex coding based on the return-to-zero modulation format are optimized through numerical simulations for long-range Brillouin optical time-domain analysis sensing. Experimental results reported sensing capabilities along 120-km distance with 1-m spatial resolution, worst-case temperature strain resolution values of 1.3 26 , respectively.
Sub-meter distributed optical fiber sensing based on Brillouin time-domain analysis with differential pulse-width pairs (DPP-BOTDA) is combined the use of pre-amplification and pulse coding. In order to provide significant measurement SNR enhancement avoid distortions in gain spectrum due acoustic-wave pre-excitation, width duty cycle Simplex coding return-to-zero pulses are optimized through simulations. addition, linear increases receiver sensitivity overall dynamic range DPP-BOTDA...
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...