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Pressure sensor realized with polarization-maintaining photonic crystal fiber-based Sagnac interferometer
H Y Fu1, H Y Tam, Li-Yang Shao
1Photonics Research Centre, Department of Electrical Engineering, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong. freddy.fu@polyu.edu.hk
Abstract:
A novel intrinsic fiber optic pressure sensor realized with a polarization-maintaining photonic crystal fiber (PM-PCF) based Sagnac interferometer is proposed and demonstrated experimentally. A large wavelength-pressure coefficient of 3.42 nm/MPa was measured using a 58.4 cm long PM-PCF as the sensing element. Owing to the inherently low bending loss and thermal dependence of the PM-PCF, the proposed pressure sensor is very compact and exhibits low temperature sensitivity.
