Fiber optic temperature sensor using the orbital angular momentum and gaussian beams

A fiber optic temperature sensor is reported based on the interference between the orbital angular momentum and Gaussian beams. A Mach-Zehnder interferometer was employed to convert the temperature signal to a light signal of the phase difference between the reference and measuring paths. The fiber Bragg grating is included in the fiber of the measuring path. Different from the traditional sensing of fiber Bragg gratings by wavelength interrogation, the temperature-dependent phase delay near Bragg wavelength was utilized in this design. The resolution of system was better than 0.01 degrees C. Moreover, the sensitivity of the system was obtained across various ranges of temperature. This system has potential applications in temperature measurements that require high resolution.