Abstract
A highly sensitive temperature sensor based on seven-core multicore fiber-polarization maintaining fiber (MCF-PM) structure fiber loop mirror is proposed and experimentally demonstrated. The effects of lengths of seven-core MCF and PM fiber on the temperature and strain sensitivities were studied. The results show that both the lengths of the MCF and PM fiber have significant impact on the temperature sensitivity of the sensor while have weak influence on the strain sensitivity. The maximum temperature sensitivity can reach −2.38nm/°C when a 12cm length of MCF and a 10cm length of PM fiber are used. The achieved temperature sensitivity is at nanometer level per Celsius, which is higher than that of the sensors with non-filled or no-coated multicore fiber reported in the literatures. The experiment results also show that the sensor has a high extinction ratio of 36dB due to the adding of the PM fiber. During the temperature stability measurement of 6 hours, the sensor exhibits a stable response to the temperatures with the maximum wavelength deviation of ~0.4nm, equivalent to 0.17°C.
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