Abstract
A novel high sensitivity temperature sensor based on side-polished Mach-Zehnder interferometer (MZI) is proposed and experimentally demonstrated. The configuration of sensor is a section of side-polished seven-core optical fiber (SCF) structure sandwiched between two waist-enlarged tapers. In the proposed sensing structure, the temperature sensitivity can be improved theoretically by coating polymer on its polished part because of the different thermal expansion effects between polymer and fiber. The experimental results show that the temperature sensitivity of the polymer-coated sensor is 4.58 times as that of the sensor without polymer coating, and the maximum sensitivity is 336.67 pm/°C in the range of 30 °C to 65 °C. The improving time is not obviously changed before coating polymer, but affected by the polishing depth of SCF in the coated structure. The results show that the temperature sensitivity of sensor can be effectively improved, and it is easy to manufacture and operate.
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