Abstract
A multi-function sensor based on rectangular-lattice photonic crystal fiber (RL-PCF) is presented and experimentally demonstrated by using Sagnac interferometer configuration into which a segment of the homemade RL-PCF is inserted. By detecting the wavelength dip shift in Sagnac transmission spectrum, the measurement of pressure, strain, curvature and temperature can be achieved. A high pressure sensitivity of 11.15 nm/MPa are obtained. To the best of our knowledge, it is the highest pressure sensitivity of the sensor based on Sagnac interferometer with PCF. The strain, curvature and temperature sensitivities are 2.92 pm/με, −339.85 pm/m−1, and 466.18 pm/°C, respectively. Experimental results demonstrate that the designed multi-function sensor based on RL-PCF takes advantages of high sensitivity, simple structure, and multi-function sensing, which makes it have a great potential in pressure detection, environmental tests and other industrial applications.
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