Temperature and strain response of Michelson interferometer with asymmetric two-core photonic crystal fiber

摘要

We fabricated asymmetric two-core photonic crystal fiber (AS-TC-PCF) and observed the temperature and strain responses of the Michelson interferometer based on it. The asymmetric two cores induce optical path length difference and produce polarization-dependent interference fringes. The temperature and strain sensitivities of the AS-TC-PCF were measured using the interference fringe shift. With increasing temperature, the interference fringes shifted to longer wavelengths, and the temperature sensitivities were measured to be 5.06 pm/°C and 11.05 pm/°C, respectively, for different polarizations. However, with increasing strain, the interference fringes shifted to shorter wavelengths, and the strain sensitivities were measured to be -0.50 pm/με and -1.87 pm/με, respectively.