Numerical analysis of highly birefringent photonic crystal fiber for temperature sensing application

In the present paper, we propose and investigate theoretically by full vector finite element method a novel temperature sensor, based on highly birefringent photonic crystal fiber infiltrated with ethanol along the fiber length. Simulation results show a linear dependence of the fiber birefringence with temperature. Birefringence is an increasing function of temperature, and the temperature sensitivity coefficient can reach 7,51 × 10−6 by Celsius degree. In comparison with other temperature sensors based on birefringent photonic crystal fibers, our designed sensor presents a higher sensitivity.