A5103183515- Advanced Fiber Optic Sensors
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Photonic Crystal and Fiber Optics
- Semiconductor Lasers and Optical Devices
- CCD and CMOS Imaging Sensors
- Advanced MEMS and NEMS Technologies
- Advanced Manufacturing and Logistics Optimization
- Advanced Memory and Neural Computing
- Advanced Image and Video Retrieval Techniques
- Robotics and Sensor-Based Localization
- Power Line Inspection Robots
- Advanced Photonic Communication Systems
- Scheduling and Optimization Algorithms
- Semiconductor materials and devices
- Belt Conveyor Systems Engineering
- Advanced Antenna and Metasurface Technologies
- Geophysics and Sensor Technology
- Optical Network Technologies
- Analytical Chemistry and Sensors
- Optical Coatings and Gratings
- Metamaterials and Metasurfaces Applications
- Photonic Crystals and Applications
- Advanced Materials and Mechanics
- Transition Metal Oxide Nanomaterials
Zhejiang Wanli University
2022-2025
China University of Mining and Technology
2024
Harbin Engineering University
2013-2023
OmniVision Technologies (China)
2023
Shandong University of Science and Technology
2023
ORCID
2018
We propose and demonstrate the cascaded multi-wavelength mode-locked erbium-doped fiber laser (EDFL) based on ultra-long-period gratings (ULPGs) for first time, to best of our knowledge. Study found that ULPG can be used as both a mode-locker pulse shaping comb filter generation simultaneously. Using dual-function ULPG, three-, four-, five-, six-, seven-wavelength pulses are obtained in EDFL, seven which largest number wavelengths up now. For four-wavelength soliton pulses, their width is...
A novel optical fiber sensor based on a balloon-shaped bent single-mode (BSBS) structure incorporating long-period grating (LPG) for simultaneous measurement of displacement and temperature is described experimentally demonstrated. The fabricated by splicing BSBS Mach-Zehnder interferometer (MZI) with (LPG). interference dip formed the sensitive to external variation, while that an LPG only depends temperature, displacement, and, therefore, can be unambiguously simultaneously measured this...
An optical fiber curvature sensor based on a twisted multimode (MMF) sandwiched between two single-mode fibers (SMF) is proposed and investigated theoretically experimentally. The measured transmission spectrum exhibits good agreement with theoretical predictions. Compared traditional single-mode-multimode-single-mode structure sensor, the configuration offers higher average sensitivity of -2.42 nm/m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
A fibre-optic strain sensor based on a gourd-shaped joint multimode fibre (MMF) sandwiched between two single-mode fibres (SMFs) is described both theoretically and experimentally. The cladding layers of the MMFs are reshaped to form hemisphere using an electrical arc method spliced together, yielding required gourd shape. section forms Fabry-Perot cavity ends adjacent but non-contacting fibres' core. effectiveness interference interferometer (FPI) formed within inter-fibre greatly improved...
The emergence of twisted metamaterials opens up an avenue for research in metamaterials. However, the current emphasis primarily lies mechanics, rendering it intriguing to explore application compression-torsion coupling effect optics. This present study introduces a thin-walled circular tube (TWCT) structure, characterized by pronounced twisting angle 59.5°, achieved only through single-layer TWCT configuration. We demonstrate significant phenomenon, surpassing findings previous endeavors....
A new optical fiber sensor made of tapered and CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> -laser-notched long-period gratings (LPFGs) is proposed for the simultaneous measurement strain temperature. Experiments are run to verify feasibility using Experimental results indicate that after two LPFGs connected with each other, sensitivity -LPFG deceases from 1.7 0 pm/με, LPFG remains unchanged; it -1.4 -1.5 pm/με. The resonance...
A novel long-period fiber grating via periodically embedding no-core (NCF) has been achieved. The 11-period SMF-NCF-SMF-long period (SNS-LPG) can exhibit an extremely high loss resonant dip (>20 dB). Theoretical analysis shows good agreement with the measured transmission spectrum. We investigated both refractive index and temperature sensitivity of SNS-LPG. fabricated sensor achieve average wavelength 141.837 nm/RIU in range 1.333–1.400 RIU, lower (−6.43 pm/ °C 0.005 dB/ °C).
Event Vision Sensors (EVS) determine, at pixel level, whether a temporal contrast change beyond predefined threshold is detected [1–6]. Compared to CMOS image sensors (CIS), this new modality inherently provides data-compression functionality and hence, enables high-speed, low-latency data capture while operating low power. Numerous applications such as object tracking, 3D detection, or slow-motion are being researched based on EVS [1]. Temporal detection relative measurement encoded by...
A sensitivity-enhanced temperature sensor based on a Mach-Zehnder interferometer (MZI) coated by polydimethylsiloxane (PDMS) film is proposed and investigated. The MZI with compact size of 2.28 mm fabricated embedding tapered single-mode fiber (SMF) between two multimode fibers (MMFs). Since PDMS has higher thermo-optical coefficient than silica, the better sensing performance case without coating, which demonstrated simulation experiment. experimental results show that sensitivity as high...
A torsion sensor with directional discrimination based on a single-mode–twisted multimode–single-mode (STMS) fiber structure is demonstrated. The STMS fabricated by fusion-splicing segment of multimode (MMF) between two single-mode fibers (SMFs), where the MMF simultaneously heated and twisted to form paired helical-type structures. experimental results indicate that resonance wavelength shifts towards shorter wavelengths as twist rate increases in clockwise direction, while an opposite...
A novel in-fibre whispering-gallery modes (WGMs) microsphere resonator based integrated device is reported.It fabricated by placing a silica into an embedded dual core hollow fibre (EDCHF).Using tapering method, can be placed and fixed in the transition section of EDCHF.The transmitted light from tapered input single-mode (SMF) coupled via two suspended cores, hence effectively excites WGMs.A Qfactor 5.54×10 3 achieved over wavelength range 1000-1200 nm.The polarization temperature...
We investigated and prepared a chirped long-period grating for high sensitivity bending measurement. The novel fiber structure is composed of the multimode (MMF) with fixed length gradually longer single-mode using continuous splicing method. powerful ability refractive index modulation in MMF renders miniaturization sensor. total sensor 3.45 mm. Chirped period arrangement adopted to improve sensitivity. Through numerical calculation, chirp coefficient determined, clear resonance peaks are...
A multimode fiber chirped long-period grating (MC-LPG) is proposed and studied as a sensor for simultaneous measurement of strain temperature. This consists linear fixed-length single-mode fiber. The numerical analyses the transmission spectrum coupling mode are carried out to obtain appropriate period arrangement. experimental results in good agreement with theoretical results. arrangement induces double peaks. Therefore, temperature realized by observing wavelength shift two In addition,...
We introduce a hybrid 4096 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\times $ </tex-math></inline-formula> 3680 CMOS image sensor (CIS) with an embedded 1032 928 event-based vision (EVS). Within four-by-four cluster of CIS pixels, one color channel is substituted to provide photocurrent for EVS pixel. The readout circuit allocated on second wafer and wrapped behind the pixel cluster. A third used...
In this letter, a packaged add-drop filter composed of silica microsphere resonator with diameter <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$80~\mu \text{m}$ </tex-math></inline-formula> and an optical microfiber coupler waist 1 notation="LaTeX">$\mu is investigated. A one-step fabrication process using UV curable epoxy shown to stabilize the coupling between coupler, which used for add drop ports....
We proposed and fabricated a long period fiber grating (PS-LPG) for simultaneous measurement of strain temperature. The is by inscribing micro-tapers on pre-tapered using the filament heating method. When temperature or varies, wavelengths both transmission notches shift in same direction, whereas depths change different directions. Therefore, sensitivity PS-LPG can be improved detecting depth difference between two notches, measurements achieved from variation wavelength difference....
A segmented long period fiber grating (LPFG)-based torsion sensor with both high sensitivity and ability to discriminate direction is proposed experimentally investigated. The made up of three spatial orthogonal short LPFGs by using a CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> laser notched method. Experimental results show that the sensitivities can reach -0.54 0.33 dB/(rad/m) in dip depth 0.30 -0.14 nm/(rad/m) resonance...
A structure made of tapered three-core fiber and CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> laser notch long-period grating is proposed in this paper. By adjusting the taper waist diameter a fiber, suitable for simultaneous strain temperature measurements. The effectiveness realizing measurement sensitivity verified by measuring sensitivities two peaks at variation wavelength depth difference. Experimental results indicate that...
We have proposed a novel tapered-single mode-no core-single mode (TSNS) fiber refractometer based on multimode interference. The TSNS structure exhibits high contrast ratio (＞15 dB) and uniform interference fringe. influence of different lengths diameters the refractive index unit (RIU) sensitivity was investigated. experimental investigations indicated maximum 1517.28 nm/RIU for 1.417 low-temperature (＜10 pm/ºC). simulation results are also in good agreement.
The spectral purity of fiber lasers has become a critical issue in both optical sensing and communication fields. As result ultra-narrow intrinsic linewidth, stimulated thermal Rayleigh scattering (STRS) presented special potential to compress the linewidth lasers. To suppress Brillouin (SBS), most dominant disturbance for STRS fibers, semi-quantitative estimation been established illuminate mechanism suppressing SBS periodic tapered fiber, it agrees with experimental results. Finally,...
A novel refractometer based on multimode fiber (MMF) embedded single mode-no core-single mode (ME-SNS) structure is presented and investigated in detail. The ME-SNS has a higher refractive index (RI) sensitivity because of the stronger evanescent field generated by RI modulation. There an obvious attenuation dip when 3 segment MMFs are (SNS) structure. Total length sensing unit only 1.8 mm. Experimental results show that maximal temperature 567.158 nm/RIU 0.009 nm/°C.
A few-mode fiber (FMF)-embedded long-period grating is proposed as a sensor for simultaneous measurement of refractive index and temperature. Periodically embedding the FMFs induces local modulation to achieve compact size obtains low insertion loss. The simulated results show that two resonance dips have opposite waveguide dispersion coefficients. Therefore, they different indices temperature sensitivities in experiment. At same time, spectral characteristics double-resonance provides...