Simulation of temperature sensor based on photonic crystal fiber using Sagnac interferometer

In the presented work we describe about new class of optical sensors. These optical fiber sensors can be designed using photonic crystal fibers. The optical fiber network has grown and roughly 35% of high speed communication is done through it. We propose a novel photonic crystal fiber application other than regular communication as a sensitive temperature sensor. In the current paper we have demonstrated proof-of-concept of a modern thermometer using photonic crystal fiber (PCF). This paper shows that propagation angle varies due to the change in birefringence which depends on the temperature. The paper also explains the use of the Sagnac interferometer for such application. Sensitivity of the PCF sensor with respect to operating wavelength is calculated from simulation and the values are 0.109, 0.123 and 0.147 rad/°C-m for 543, 975 and 1310nm incident light respectively.