High-temperature sensor based on suspended-core microstructured optical fiber

We propose a high-temperature sensor based on a suspended-core microstructured optical fiber (SCMF). The sensor is constructed by fusion splicing a piece of SCMF between two sections of multimode fibers (MMFs) which act as light beam couplers. The multimode interference is formed by the air cladding modes and the silica core modes in the SCMF. Fast Fourier transform is adapted to filtering the raw transmission spectra of the MMF-SCMF-MMF structure. The wavelength shift of the dominant spatial frequency is monitored as the temperature varies from 50 degrees C to 800 degrees C. The sensitivities of 31.6 pm/degrees C and 51.6 pm/degrees C in the temperature range of 50 degrees C-450 degrees C and 450 degrees C-800 degrees C are respectively achieved. Taking advantage of the compact size, good stability and repeatability, easy fabrication, and low cost, this proposed high-temperature sensor has an applicable value. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement