Abstract
An optical fiber strain sensor by using a low-birefringence photonic crystal fiber (PCF)-based Sagnac loop is demonstrated. A fiber Sagnac loop is formed by the low-birefringence PCF of about 40 cm, and a section of about 140-mm PCF is used as the strain sensing element. The output spectra of Sagnac loop under different strain levels are measured and analyzed. The sensitivity of the strain measurement of -0.457 pm/μe is achieved within the range of 0-2520 μe. The temperature effect is also analyzed.
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