Competence Center for Specialty Optical Fibers

A fiber-optic Fabry–Pérot sensing structure based on the utilization of a suspended-core fiber is presented. The interferometric structure is formed when a small length of the suspendedcore fiber is spliced to the end of a standard single-mode fiber. The interfering waves are generated by the refractive-index mismatches between the two fibers in the splice region and at the end of the suspended-core fiber. Thermal and strain responses of two different sensing heads associated with suspended-core fibers with three and four holes are characterized.