Random Fiber Gratings Fabricated Using Fs-IR Laser for Distributed Temperature Sensor Application

By using the plane-by-plane grating inscription method with a fs-IR laser, random fiber gratings were fabricated in SMF-28 fiber with different phase shifts between different planes for temperature sensing. With the well-defined bandwidth of the enhanced backscattering, the random grating based distributed temperature sensing system shows high accuracy of temperature measurement and low laser-induced loss.