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Dual-parameter amplification sensing of temperature and strain by using parallel dual Fabry–Perot interferometer

In this paper, we proposed and demonstrated a parallel optical fiber Fabry–Perot interferometer (FPI) for temperature and strain sensor based on an optimized 3×2 steps fabrication process, aiming to improve the quality of the sensitivity by use of the Vernier effect. The sensor consists of two FPIs with different propagation mediums in parallel connection, which is formed by pairs of built-in plate reflectors, another is fabricated by splicing a three-hole fiber (THF) supported by a suspension core, the higher thermal-optical coefficient can improve the temperature sensitivity. In temperature and strain sensing, two different combinations of FPIS are used as sensing units and matching reference units respectively. The amplification is matched to the wavelength range of the light source by accurately controlling the cavity length between the two FPIs. The temperature and strain sensitivities achieved in the experiment are 182.15 pm/°C and 201.47 pm/µε, respectively. The separate settings of temperature and strain sensing amplification increase the flexibility applications of dual-parameter amplification sensors.