Miniaturized Fabry-Perot probe utilizing PMPCF for high temperature measurement

We propose a miniaturized optical fiber Fabry-Perot probe for high temperature measurement (up to 1000 ̊C). It is simply fabricated by fusion splicing a short section of polarization maintaining photonic crystal fiber (PMPCF) with a single mode fiber (SMF). The interface between the core of SMF and air holes of PMPCF, and the end face of PMPCF work as the mirrors. The pure silica core of PMPCF is employed as the sensing element. Experimental results show that the probe has a high thermal stability and the temperature sensitivity reaches up to 15.34 pm/ ̊C, which is not affected by the length of PMPCF. The linearity of temperature response is as high as 99.83%. The proposed sensor has promising prospects in practical applications due to simple fabrication process, low cost, compact size and excellent repeatability.