OPTICAL FIBER STRUCTURE FOR SENSORS

摘要

The invention relates to the field of optical fiber structures, preferably adapted for use with fiber Bragg gratings in sensors. The fiber structure has birefringence and comprises a core and a cladding surrounding the core, a central microstructure (1) comprising a first plurality of longitudinal holes for guiding optical radiation, a side microstructure (2) comprising a second plurality of longitudinal holes, wherein the side microstructure (2) is at least partly surrounding the central microstructure (1) and is adapted for providing a predetermined mechanical anisotropy, a pressure responsive unit, a lateral force responsive unit, a temperature responsive unit, and a birefringence responsive unit adapted for converting birefringence in the core to wavelength information. In this way, a fiber structure is provided that allows increasing the ratio of mechanical to thermal sensitivity up to several orders of magnitude with similar sized mode areas.