Abstract
The application of liquid filled single-polarization fiber for sensing is demonstrated. The single-polarization fiber with two air columns has only one polarization state transmitted in the core, but after being infiltrated liquid with suitable index, the fiber becomes highly birefringent and the light guided in the fiber is no longer single-polarized. Based on the principle of interference of two polarization states, possible application for temperature or twist measurement is discussed. The temperature measuring range can be modified by adjusting the concentration of glycerol-water solution, the sensitivity reached 1.82 nm/°C in our example. Moreover, twist can be measured according to variation of interference intensity.
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