Cylindrical Bragg waveguide based temperature sensors

Cylindrical Bragg waveguide based temperature sensor having a defect layer in cladding region is proposed and studied theoretically. The waveguide consists of SiC core surrounded by alternate Si and SiO₂ cladding layers with a defect layer. The transmittance of waveguide is obtained using transfer matrix method. It is observed that thermal expansion coefficient and refractive index of SiC varies linearly with temperature. The obtained sensitivity in our proposed sensor is approximately 51.48pm/Celsius, which is much larger than the reported 9pm/Celsius similar fiber Bragg grating based sensors.