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A new method to modify excessively titled fiber gratings (Ex-TFGs) with 20 nm gold nanoparticles (GNPs) through 3-mercapt-otrimethoxysilane(MPTMS) was proposed. By monitoring the wavelength shift of Ex-TFGs for every modified step and using the scanning electron microscope (SEM), it proves that GN Ps are firmly combined on the surface of Ex-TFGs. Finally, by using different concentration of NaCl solutions...
Here we demonstrate, to the best of our knowledge, a tunable 1.5 μm narrow linewidth fiber ring laser using a temperature tuning π-phase shifted fiber Bragg grating (π-PSFBG) for the first time. The π-PSFBG is employed as both a narrow band filter and a wavelength tuning component by a thermo electric cooler (TEC). The tuning range of the laser is 1.29 nm with the precision of 14 pm/°C, and the maximum...
In this study, we demonstrate In-line fiber Mach-Zenhder interferometer measuring for vibration in this device we using the hydrogen flame, this sample device can excited high order cladding mode then we used such interferometer to measure vibration.
We demonstrate a new fiber-optic current sensor based on graphene nanoelectromechanical systems (NEMS) with a graphene membrane covering the hole on a fiber tip and two gold electrodes on opposite sides of the tip. The suspended graphene membrane will deform due to thermal effect when electrical current flows through it. Then the strain in the graphene nanomechanical resonator will change and it leads...
A sensitivity-enhanced temperature sensor based on Vernier-effect was demonstrated. Vernier-effect is achieved by a cascaded configuration with a fiber Sagnac interferometer (FSI) and a Fabry-Perot interferometer (FPI). FSI, which consists of a certain length of polarization maintaining fiber, is for temperature sensing, while. FPI acts as a filter due the temperature insensitivity. Experimental results...
A type of newcastle disease virus (NDV) immunosensor based on 81° tiled fiber grating (81° TFG) was proposed. Staphylococcus aureus Protein A (SPA) was used to modify the surface of 81° TFG, then highly purified NDV monoclonal antibodies (MAbs) were immobilized on 81° TFG surface through SPA molecules. The experimental results show that, the immunosensor has a lowest limit of detection (LOD) of 0...
In this paper, a novel microfiber refractive index sensor prepared with tapering-twisting-tapering technique has been proposed and demonstrated for the first time. Experimental results show that the interference intensity of the novel microfiber increases with the increment of pre-tapered length and the intervening twist number. Furthermore, the refractive index sensitivity of this microfiber sensor...
A new scheme for fabricating microtapered long-period fiber gratings (LPFGs) and helical LPFGs is proposed and demonstrated successfully by periodically tapering and twisting a standard single-mode fiber, respectively, using a CO2 laser fusion splicer as heater. In comparison to previous fabrication methods, our scheme can significantly improve the quality of the microtapered and helical LPFGs. Considering...
In this paper, a fiber-optic sensing system for simultaneous measurement of temperature and transversal loading based on a fiber-ring microwave photonic filter (MPF) has been proposed and experimentally demonstrated. The temperature variation will induce the central frequency shift of the MPF's passband, while the micro-bend loss induced by transversal loading will cause the change of extinction ratio...
An in-line Mach-Zehnder interferometric refractive index (RI) sensor is demonstrated by concatenating two single-mode fiber (SMF) half-tapers separated by one section of SMF. The cladding modes excited at the first half-taper interferes with the core mode at the second half-taper to generate the interference fringe. Theoretical and experimental results consistently show that the interference fringe...
The large-scale novel fiber sensor network based on cloud computing is proposed. The cross distribution of the fiber Bragg grating network and the distributed fiber sensor network expands in size of the fiber sensor network and realizes the three-dimensional measurement. Mass data acquisition and real-time analysis of the large-scale fiber sensor network have been a technology bottleneck. It can paralyze...
A multiwavelength random fiber laser based on stimulated Brillouin scattering (SBS) with odd and even order Stokes output separated is proposed and demonstrated experimentally. The gain is provided by the SBS and erbium doped fiber amplifier, while the Rayleigh scattering in single mode fiber (SMF) provides random distributed feedback. With a two-branch structure, we successfully make the laser output...
This paper proposes a kind of orbital angular momentum (OAM) mode supporting fiber based on photonic crystal fiber structure, give a design strategy for designing a family of circular photonic crystal OAM fiber with the good transmission performance features such as good quality OAM modes, enough separation of the effective indices, low confinement loss, flat dispersion, large effective area, and...
We demonstrated experimentally a stable 1μm multi-wavelength YDF based random fiber laser by using a polarization independent Sagnac-loop mirror with output power of 1.6W and high OSNR of 30dB.
Most sensors have the tradeoff dilemma of high sensitivity and large dynamic range. We demonstrate here an all-fiber refractive index sensor based on a composite intrinsic Fabry-Perot interferometer (FPI), which possesses the co-existence advantages of high sensitivity and large dynamic range. Experimental trends are in good agreement with the theoretical predictions. The co-existence of high sensitivity...
A helical long-period grating (HLPG) was written in a polarization maintaining fiber (PMF) with CO2 laser. The twist characteristics of individual and cascaded PMF-HLPG were investigated experimentally. It was found that PMF-HLPG behaved differently with a different light input. When a polarized light was launched into the cascaded PMF-HLPGs with opposite helical direction, a high twist sensitivity...
The sensing performance in Brillouin-based distributed fiber sensors is ultimately depends on the signal-to-noise ratio (SNR) of the received signal. In order to enhance the SNR, thus improve the sensing performance, several wavelength diversity techniques have been proposed. This paper presents the current wavelength diversity techniques employed in both Brillouin optical time-domain reflectometry...
Ballistocardiography (BCG) is a non-invasive method for measuring the reaction force of the human body to the ejection of blood at each cardiac cycle. It is now being the subject of renewed research interest due to recent technological advancement in the field of sensors. In this paper, we summarize our work on BCG with optical fiber sensors for various applications in the past 6 years. These include...
Ballistocardiography (BCG) is a non-invasive method for measuring the reaction force of the human body to the ejection of blood at each cardiac cycle. It is now being the subject of renewed research interest due to recent technological advancement in the field of sensors. In this paper, we summarize our work on BCG with optical fiber sensors for various applications in the past 6 years. These include...
A temperature demodulation method by using compensation of fiber attenuation and dispersion for distributed temperature sensors (DTS) is proposed and demonstrated in order to improve the DTS measuring speed and accuracy. Firstly, the attenuation coefficients difference between anti-Stokes and Stokes backscattering is modified, which avoids the calibration processing on the entire sensing optical fiber...
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