Technology and basic sensor properties of the dual core holey fiber

The paper presents the technology of manufacturing dual core holey fibers and of measuring their basic sensor parameters. The measurements of the structural parameters, coupling length, Lc, temperature sensitivity, KT, pressure sensitivity, KP, was done from the angle of using this type of fiber in optical fiber sensors. The measurements were done for different directions of polarization of input light and for introducing light to one core and to two cores. It was found that the properties of the optical fiber depend on the conditions of light introduction. The results of these measurements were compared with analogous measurements for the high birefringence elliptical core optical fiber, high birefringence side-hole fiber, dual core optical fiber and high birefringence elliptical core holey fiber.