Coupled Energy Measurements in Multi-Core Photonic-Crystal Fibers

Abstract

This paper outlines a measurement method of properties of microstructured optical fibers that are useful in sensing applications. Experimental studies of produced photonic-crystal fibers allow for a better understanding of the principles of energy coupling in photonic-crystal fibers. For that purpose, fibers with different filling factors and lattice constants were produced. The measurements demonstrated the influence of the fiber geometry on the coupling level of light between the cores. For a distance between the cores of 15 µm, a very low level (below 2%) of energy coupling was obtained. For a distance of 13 µm, the level of energy transfer to neighboring cores on the order of 2-4% was achieved for a filling factor of 0.29. The elimination of the energycoupling phenomenon between the cores was achieved by duplicating the filling factor of the fiber. The coupling level was as high as 22% in the case of fibers with a distance between the cores of 8.5 µm. Our results can be used for microstructured-fiber sensing applications and for transmission-channel switching in liquid-crystal multi-core photonic fibers.

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“… carried out light scattering measurements with calibrations to investigate a high‐speed emulsifying flow in a mini channel. Klimek and Skorupski dealt with measurements of properties of fibers with cores. Fibers were also considered by Swirniak and Glomb who dealt with a method of low‐coherent light scattering with small angle light detection for glass fibre characterization, in which diffraction was essentially the only scattering process involved.…”