The different topics of this thesis include high-temperature stable fiber Bragg gratings, photosensitivity and fiber based components. Fiber Bragg gratings (FBG) are wavelength dispersive refractive index structures manufactured through UV exposure of optical fibers. Their applications range from WDM filters, dispersion compensators and fiber laser resonators for telecommunication applications ...

We have experimentally demonstrated an optical fiber Mach-Zehnder interferometer (MZI) structure formed by a few-mode photonic crystal fiber (PCF) for curvature measurement and inscribed a fiber Bragg grating (FBG) in the PCF for the purpose of simultaneously measuring temperature. The structure consists of a PCF sandwiched between two multi-mode fibers (MMFs). Bending experimental results show...

An interrogation technique for fiber Bragg grating (FBG) strain sensors with dynamic temperature compensation using a single-multiple-single-mode (SMS) fiber filter as a temperature compensating element is presented. Experimental results show that this technique offers a resolution of better than 3.4 muepsilon for strain measurements in the range from 0 to 1667 muepsilon, and the temperature in...

Abstract In the search of an adequate real time strain measurement method in aluminum casting, use Fiber-Bragg-Grating ( FBG ) is being investigated with great interest. order to do so, behaviour glass fiber sensors a liquid aluminium alloy at temperatures up 750°C experimentally analysed laboratory environment. For better process understanding simulation composite conducted. optical method, wh...

The storage wavelength of quantum nodes based on atomic systems does not match the optical fiber communication, which requires establishment an efficient conversion system between flying bits and bits. In this paper, nonlinear technology periodically poled lithium niobate waveguide, a low-noise 852-nm photons to 1560-nm was achieved by 1878-nm pump laser. generation mechanism transmission noise...

Aircraft operators are faced with increasing requirements to extend the service life of air platforms beyond their designed life cycles, resulting in heavy maintenance and inspection burdens as well as economic pressure. Structural health monitoring (SHM) based on advanced sensor technology is potentially a cost-effective approach to meet operational requirements, and to reduce maintenance cost...

Corrosion cracking of reinforced concrete caused by chloride salt is one of the main determinants of structure durability. Monitoring the entire process of concrete corrosion cracking is critical for assessing the remaining life of the structure and determining if maintenance is needed. Fiber Bragg Grating (FBG) sensing technology is extensively developed in photoelectric monitoring technology ...

The spectral linewidth from two cross-correlated fiber Bragg gratings (FBGs) are interrogated and characterized using a delayed self-homodyne method for fiber strain sensing. This approach employs a common higher frequency resolution instead of wavelength. A sensitivity and resolution of 166 MHz/με and 50 nε were demonstrated from 4 GHz spectral linewidth characterization on the electric spectr...

A compact and label-free optical fiber sensor based on a taper interferometer cascaded with a fiber Bragg grating (FBG) is proposed and experimentally demonstrated for detection of a breast cancer biomarker (HER2). The tapered fiber-optic interferometer is extremely sensitive to the ambient refractive index (RI). In addition, being insensitive to the RI variation, the FBG can be applied as a te...

Aiming at the existing problems of low efficiency, lagging monitoring results, and poor reliability accuracy in present roadway roof separation system, a high-precision Fiber Bragg Grating (FBG) indicator is designed through theoretical analysis, numerical simulation, laboratory tests—according to fiber grating sensing principle. Based on Microsoft. Net platform, C# programming language, VS2010...