Temperature characteristics of high birefringence photonic crystal fiber filled with liquid

In this paper, the theoretical model of high birefringence photonic crystal fiber(PCF) has proposed by the plane wave expansion method. The temperature impacts of the birefringence and beat length in high birefringence PCF which filled with ethanol were numerical analyzed. The results show the refractive index of filling liquid significantly influence on the birefringence and beat length. When the wavelength increases, the birefringence increases while the beat length decreases, when the temperature increases, the birefringence also increases while the beat length decreases. In addition, the temperature affected the birefringence and beat length. Especially the birefringence of high birefringence PCF is more sensitive to temperature. When the wavelength is longer, these results for design temperature sensors have certain reference significance.