LAUSR

Abstract In this paper, a microfiber Fabry-Perot interferometer temperature probe is proposed by fixing and encapsulating a microfiber and single-mode fiber in the silica capillary using polydimethylsiloxane (PDMS). In this structure, the cavity length of the Fabry-Perot interferometer refers to the distance between the end-face of the microfiber and that of the single-mode fiber, which can be adjusted precisely by 3D fiber adjustments. The microfiber Fabry-Perot interferometer has a microfiber diameter of 73 μm and a cavity length of 39 μm, being experimentally demonstrated with a high-temperature sensitivity of 6.386 nm/°C from 42 °C to 54 °C. An interesting optical modulation phenomenon has also been observed. This compact fiber probe can be used for real-time monitoring of temperature fluctuations in small and complex environments.