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We report with cladding-carved DBR fiber lasers the responses of beat frequency on external refractive index (RI). Those carves are fabricated by the CO2 laser milling technique. The device performance with different carve widths and depths are fabricated and compared with each other. The measured maximal sensitivity is up to ∼−240.4MHz/RI-unit. This study presents a useful exploration for the dual-frequency...
A compact dual-parameter sensor based on a fiber-optic interferometer consisting of a peanut fiber taper and a long-period fiber grating integrated with magnetic fluids has been proposed and experimentally demonstrated. By employing a sensor matrix containing distinct magnetic field intensity and temperature sensitivities of different interference dips, simultaneous dual-parameter measurement could...
A compact fiber interferometric probe with high contrast based on a long period grating inscribed in an all-solid photonic bandgap fiber is proposed and demonstrated. The LPG functions as a beam splitter and combiner for the fundamental core mode and LP01 cladding supermodes, and the fiber probe works from the interference between the two guided modes. The sensitivities of the interferometer to strain...
In this paper, a compact all-fibre modal Mach-Zehnder interferometer (MMZI) is presented that based on two notches at different location along normal single-mode fibres by CO2 laser irradiation. This novel configuration was demonstrated as a bending sensor and it offers salient advantages of simple fabrication technique of low cost.
We demonstrate a novel wireless sensors network available for multi-dimension and multi-parameter measurement based on fiber Bragg grating sensing units. The combination of wireless communication with the fiber Bragg grating sensors obtains obvious advantages including inherent immunity to electromagnetic interference, compact size and high sensitivity compared with conditional wireless sensing network...
In this letter, we propose a novel structure of the pure macro-bending sensor based on the tilted fiber Bragg grating (TFBG). The TFBG located in the half circle with the different diameters is bent at a constant angle with respect to the tilted grating planes. With the variations of the curvature, the core-mode resonance is unchanged and the transmission power of cladding modes detected by the photodiodes...
We propose a laser sensing system based on beat frequency demodulation. The sensor uses a single-longitudinal-mode distributed Bragg reflector (DBR) fiber laser as sensing element. This laser sensor has great multiplexing capability due to its wide free spectral range. Wavelength-Division-Multiplex (WDM) and Frequency-Division-Multiplex (FDM) techniques were studied. The sensing system has high sensitivity...
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