A5101486093- Advanced Fiber Optic Sensors
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Non-Invasive Vital Sign Monitoring
- Photonic Crystal and Fiber Optics
- Advanced Photonic Communication Systems
- Semiconductor Lasers and Optical Devices
- Advanced Sensor and Energy Harvesting Materials
- Nonlinear Photonic Systems
- Nonlinear Waves and Solitons
- Semiconductor Quantum Structures and Devices
- Image Enhancement Techniques
- Optical Coatings and Gratings
- Radio Frequency Integrated Circuit Design
- Infrared Thermography in Medicine
- Analytical Chemistry and Sensors
- Semiconductor materials and devices
- Photonic Crystals and Applications
- Tactile and Sensory Interactions
- Sensorless Control of Electric Motors
- Telomeres, Telomerase, and Senescence
- Real-time simulation and control systems
- Thermoregulation and physiological responses
- Mesenchymal stem cell research
- Real-Time Systems Scheduling
Tiangong University
2014-2024
Tianjin University of Technology
2017-2022
Tianjin University
2018-2021
A novel refractive index fiber laser sensor based on a Bragg grating (FBG) integrated with section of no-core (NCF) is proposed and experimentally demonstrated. The oscillating wavelength the only decided by central FBG that insensitive to surrounding (SRI). However, output power varies SRI because filtered edge bandpass filter (BPF) formed multimode interference (MMI) effect in NCF, which sensitive SRI. By measuring variation power, cost-effective detection RI could be realized. has linear...
A multipoint fiber optic sensor based on two cascaded multimode interferometer (MMI) and Bragg grating (FBG) structures is proposed demonstrated for simultaneous measurement of refractive index (RI) temperature. The MMI fabricated by splicing a section no-core (NCF) with single-mode fibers. suitable NCF lengths 19.1 38.8 mm are selected simulations to achieve wavelength division multiplexing. MMIs sensitive RI temperature the maximal sensitivities 429.42228 399.20718 nm/RIU in range 1.333...
Wearable technology constitutes a pioneering and leading innovation market development platform worldwide for technologies worn close to the body. optical fiber sensors have most value advanced multiparameter sensing in digital health monitoring systems. We demonstrated first example of fully integrated interrogator. By integrating all components on silicon photonic chip, we realized stable, miniaturized low-cost interrogator continuous, dynamic, long-term acquisition human physiological...
An arrayed waveguide grating (AWG) demodulation integration microsystem is investigated in this study. The system consists of a C-band on-chip LED, 2 × silicon nanowire-based coupler, fiber Bragg (FBG) array, 1 8 AWG and photoelectric detector array. coupler are made from silicon-on-insulator wafers using electron beam exposure response-coupled plasma technology. Experimental results show that the excess loss MMI with footprint 6 100 μm2 0.5423 dB. 267 381 width 0.4 μm exhibits central...
Here, Raman microspectroscopy was employed to assess replicative senescence of mesenchymal stem cells (MSC).A regular spectral change related the cell found in ratio two peaks at 1157 cm -1 and 1174 , which are assigned C-C, C-N stretching vibrations proteins C-H bending tyrosine phenylalanine, respectively.With aging, I / exhibited a monotonic decline showed small standard deviations, so that it can statistically distinguish between having slight changes terms aging.We propose act as...
A differential intensity modulation refractometer based on single-mode-no-core-single-mode (SNS) structure cascaded with two fiber Bragg gratings (FBGs) is proposed. The SNS acts as a band pass (BPF), and the wavelengths of FBGs located at each edge BPF. Because interference spectrum sensitive to refractive index (RI) but FBG not, reflective powers are modulated by surrounding (SRI) have contrary changing trends. difference used describe change SRI, which not only increases RI sensitivity...
Clothing-based respiratory monitoring can provide real-time non-invasive services for subjects, and be used as a reference daily health observation. In this study, an optical fiber sensing Section woven into plain fabric is produced by hand-weaving machine, the then made garment. This paper explored luminescence coupling principle of notched through theoretical analysis simulation, demonstrated feasibility making it fabric. We structure to make sew with yoke smart testing, we obtained static...
A sensor head consisting of an all single-mode fiber (SMF) in-line Mach–Zehnder interferometer (MZI) with embedded Bragg grating (FBG) is proposed and experimentally demonstrated for simultaneous measurement curvature temperature. It fabricated by cascading two bulge-taper fusion structures in a section SMF including FBG. The MZI sensitive to bending ambient temperature sensitivity −16.59 nm/m−1 the range 1.05 4.05 m−1 58 pm/°C 30°C 100°C, respectively. However, FBG only latter 13 pm/°C....
It is significant to monitor respiration conveniently and in real time for people suffering from respiratory diseases. Polymer optical fibers (POFs) have the advantages of flexibility light weight, which highly desirable wearable monitoring. However, most current applications, POFs are stitched on textile substrates form macro-bending. This method complex fix bending with certain curvatures uncomfortable compared POF sensors woven into textile. In this paper, a fabric sensor based side...
A widely tunable ultra-narrow linewidth single-longitudinal-mode Brillouin fiber laser (SLM–BFL) with low threshold is proposed and experimentally demonstrated by using a 205 m long high-nonlinear (HNLF) as gain media. The (SLM) operation guaranteed cascaded filters composed of ring Fabry–Pérot filter self-induced narrow based on 4 unpumped erbium-doped fiber. Owing to the cavity, BFL has 12.8 mW 0.29 kHz. can be tuned from 1532 1577 nm. optical signal-to-noise ratio higher than 70 dB during...
A 50 nm tuning range multiwavelength Brillouin-erbium fiber laser (MWBEFL) with double Brillouin frequency spacing is presented. Two separated gain blocks symmetrical architecture, consisted by erbium-doped amplifiers (EDFAs) and media, are used to generate spacing. The wider realized eliminating the self-lasing cavity modes existing in conventional MWBEFLs because of absence physical mirrors at ends linear cavity. pump (BP) preamplified EDFA before entering single-mode (SMF), which leads...
A highly efficient polarization-independent output grating coupler was optimized and designed based on silicon-on-insulator used for silica-based hybrid photodetector integration in an arrayed waveguide demodulation-integrated microsystem. The finite-difference time-domain (FDTD) method optimizes coupling efficiency by enabling the design of period, duty cycle, etch depth, length, polarization-dependent loss (PDL). efficiencies both transverse electric (TE) magnetic (TM) modes are higher...
A wideband double-Brillouin-frequency spaced multiwavelength Brillouin–erbium fiber laser (MWBEFL) with 110 nm tuning range is demonstrated. The utilizes simple compound-ring cavity structures which confine the odd-order Brillouin–Stokes (BS) signals within right ring and couple out initial Brillouin pump signal (BP) even-order BS to generate a 0.176 spacing multiwavelength. wavelength- bandwidth-tunable optical band-pass filter (TBF) used manipulate location of self-lasing get range. All...
Permanent magnet synchronous machines are known as a good candidate for hybrid electric vehicles (HEV) due to their unique merits. According the characteristic that d,q-axis inductances not equal in interior permanent motors (IPMSM), this paper introduces maximum- torque-per-ampere (MTPA) control scheme, which can get larger torque output under certain current condition. A relationship about minimum d, q- axis currents required is derived by maximum principle. In same capacity, relative i...
Magnetic resonance imaging (MRI) has become an indispensable aid to diagnosis and treatment. As the doctor cannot accompany patient, it is essential that patient be monitored remotely avoid risk of respiration being impaired by anesthetic drugs or upper airway obstruction. A smart wearable textile sensing system described in this paper. fiber Bragg grating (FBG) with polymer encapsulation been woven into elastic bandage detect motion. According strain principle FBG, breathing rate intensity...
A stable dual-wavelength erbium-doped fiber ring laser with switchable spacing is proposed and experimentally demonstrated. An arrayed waveguide grating (AWG) incorporating two optic switches (OS) used to as the wavelength selector. The cavity divided into cavities by a 30:70 optical coupler. Equalized outputs are achieved controlling variable attenuator (VOA) inserted in lower loss cavity. can be tuned from 0.80 12.05 nm. has good quality maximum power fluctuation of 1.5 dB side mode...
A fiber Fabry-Perot (F-P) temperature sensor sealed with thermosensitive polymer has been proposed and demonstrated. The structure of fully enclosed quartz probe reduces the interference from ambient pressure refractive index (RI). automatic fabrication process microflow injection discharge welding is simple improves controllability repeatability structural parameters. demodulation method for expanding measurement range temperature. results show that good linear response a sensitivity −1.014...