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We report a fiber optic vibration sensor developed from a Fiber Bragg Grating (FBG) sensor. Three FBG vibration sensors are constructed and subjected to drop test, vibration test and mock train-railway positioning test. All the Bragg wavelengths of the sensors, as well as the Fast Fourier Transform (FFT) graphs are recorded by a computer via an FBG interrogator. Two commercial FBG vibration sensors...
An all-fiber structured wavelength-tunable second-order photonic temporal differentiator based on a digital controlled linearly chirped fiber Bragg grating is experimentally demonstrated. The central optical frequency of the differentiation can be reconfigured flexibly.
A simple and compact reflective liquid level sensor based on the modes conversion in optical fibers is proposed and experimentally demonstrated. High liquid level sensitivity and temperature immunity are experimentally achieved.
A photonic crystal fiber (PCF)-model interferometer (MI)-based relative humidity (RH) sensor is proposed and experimentally demonstrated. The PCF-MI is formed by fusion splicing a short length of PCF between two single-mode fibers with the air holes of the PCF in the splicing regions being fully collapsed. It was then coated with a layer of polyvinyl alcohol by using a dip-coating process. Experimental...
We proposed a dual-wavelength single-longitudinal-mode (SLM) erbium-doped fiber (EDF) ring laser, incorporating a phase-shifted chirped fiber Bragg grating (PS-CFBG) in the laser cavity. The PS-CFBG consists of a permanent phase shift and a thermo-induced temporary phase shift to form two passbands in the spectrum. The wavelength spacing of the two passbands can be continuously tuned by scanning the...
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