Abstract
An optical fiber curvature sensor with low-birefringence photonic crystal fiber (PCF) based Sagnac loop is demonstrated experimentally. The low-birefringence PCF of about 40cm long is inserted into Sagnac loop, and a section of it about 155mm is used as the sensing element. The Sagnac output spectra under different curvatures are measured and analyzed. The results show that the wavelength shift of the transmission dip has a linear relationship with the curvature. The sensitivity of the curvature measurement of −0.337nmis achieved in the range of 0–9.92m−1. And the temperature effect of the proposed sensor is also analyzed.
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