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We report on the experimental demonstration of a refractive index sensing technique based on the photonic bandgap (PBG) shift in two types of solid-core photonic crystal fiber (PCF) structures with a series of high refractive index infiltrations. Bandgap edge and central wavelength with a significant red-shift are observed with the increase of infiltration material index. The measurement results from...
In this paper, coupled-mode theory is applied to a two-core microstructured optical fiber for the first time to calculate the coupling coefficients for different fiber structures by employing a simple effective index model approach. The dependence of the mode coupling properties upon the geometrical parameters of the two-core structures (air-hole arrangement, hole size, and pitch size) and wavelength...
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