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Electrical spectral tuning of long-period gratings (LPGs) coated with high refractive index liquid crystal (LC) layer is presented. Temperature is stabilized at 60degC to obtain a high sensitivity operating point. The tuning range is ~10 nm.
We study the response of high refractive index coated LPFG to temperature based on liquid crystal. The maximum shift of the resonant wavelength of LPFG is about 8 nm when temperature is between 58degC and 60degC.
Nano-scale HRI liquid crystal (LC) coatings are evenly smeared along long period gratings (LPGs). Experimental results show that the transition between cladding modes and overlay modes occurs when the refractive index of the LC layer is changed from 1.477 to 1.515 by increasing temperature. The sensitivity enhancement to HRI in the transition region is approximately 6 times the sensitivity outside...
A long period grating is eroded. Experimental results show that resonant wavelength shift of can be enhanced by choosing thinner cladding radius and higher order cladding mode. Analysis is given to explain the principle.
This paper presents some key issues in fiber-optic interferometric magnetic field sensors. Practically applicable methods to design and implement fiber-optic Michelson interferometer and transducers are described with experimental verifications. Detection scheme of traditional hardware demodulation is improved, and a new software demodulation method is addressed. Transducers were implemented by using...
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