Modal Interferometer Based on ARROW Fiber for Strain and Temperature Measurement

In this letter, interferometric sensors based on antiresonance reflecting optical waveguide (ARROW) fibers were developed, and used to sense strain and temperature. Two types of solid-core ARROW fibers were considered and signal demodulation was achieved by using the white light interferometric technique. The ARROW fibers have two rings of high index rods arranged in a hexagonal structure with a lattice constant of≈6. The different sizes of the rods cause different measurand sensitivities for the two fibers. Resolutions of±1.1μ εand±0.07∘Cwere achieved for strain and temperature, respectively.