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Visible light communication (VLC) using light emitted diodes (LEDs) has been considered as the most attractive solution for indoor positioning. In this paper, an indoor visible light positioning system taking account of multiple reflections is investigated. Based on received signal strength indication (RSSI) algorithm, the positioning error distributions are simulated and show that the reflections...
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 random phase-shifted fiber Bragg grating has been theoretically analysed by the transfer matrix method. Numerical predictions of the effects of phase-shifted points on the reflection spectra of such a grating are calculated. This fiber Bragg grating with 10 random phase-shifted points distributed has been fabricated. These predictions are compared with experimentally measured spectra of the random...
We proposed a portable online Raman detection system with all fiber components, by inserting two large-diameter optical fibers respectively into each end of the inner metal-coated capillary for Raman excitation and signal collection simultaneously. The all fiber structure not only could enhance the interaction length between the excitation beam and the detecting material, but also provide a very effective...
A static-strain FBG-FPs sensor with high resolution based on empirical mode decomposition (EMD) and wavelet algorithm is proposed. The FBG-FPs are interrogated by a narrow-linewidth fiber laser which is driven by an optical single sideband (SSB-SC) modulator. Adaptive basis functions which are denoised by wavelet algorithm can be extracted from two FBG-FPs' reflection spectra by EMD. Adaptive basis...
The effect of gamma radiation with a maximum dose of 180 kGy at a dose rate of 10.15 kGy/hour on both standard Ge-doped fiber Bragg Gratings (Ge-FBG) and femtosecond-laser-inscribed pure-silica-core fiber Bragg Gratings (FL-PS-FBG) have been investigated. In the case of Ge-FBGs, a maximum Bragg wavelength shifts (BWS) of 140 pm and a decrease of the reflection peak power of 16 dB has been observed...
Laser underwater detection technology is widely used in seawater ranging, mine detection, positioning and other fields. This article is for airborne laser underwater exploration submarine technology, proposed a kind of airborne laser underwater exploration submarine system program, the system composition and working process are discussed, the energy link model of trans-atmosphere and seawater is focused...
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