Design of fiber bragg grating (FBG) temperature sensor based on optical frequency domain reflectometer (OFDR)

Nani Fadzlina Naim (Universiti Teknologi MARA (UiTM))
Siti Noor Maslizan Sudin (Universiti Teknologi MARA (UiTM))
Suzi Seroja Sarnin (Universiti Teknologi MARA (UiTM))
Norsuzila Ya'acob (Universiti Teknologi MARA (UiTM))
Latifah Sarah Supian (Universiti Pertahanan Nasional Malaysia)

International Journal of Electrical and Computer Engineering
Vol 10, No 3: June 2020

In this paper, the simulation of Fiber Bragg Grating (FBG) as a temperature sensor is conducted. The FBG temperature sensor is designed based on Optical Frequency Domain Reflectometer (OFDR) concept. A continuous wave (CW) laser is used as the optical source and it is transmitted to two FBGs. The two FBGs reflection spectra will produce a beat frequency that can be detected using a Radio Frequency (RF) Spectrum Analyzer. Any temperature change will shift Bragg wavelength, thus produce a shift for the beat frequency. In this work, an FBG with temperature sensitivity 10 pm/˚C is employed. It is found that by using this technique, a high-resolution temperature sensor can be designed with temperature resolution of 0.1˚C.