In this paper, we present a Fiber-Bragg-Grating-based temperature sensor. The technique employs heterodyne detection using two Fiber Bragg Gratings. One of the gratings is used as a reference (local oscillator) and the second as a sensing arm. This sensor uses a Folded Mach-Zehnder interferometer. As the temperature changes, the Bragg wavelength of the FBG shifts. The heterodyne detection is used to detect the frequency difference between the reference and sensing signals that is caused by the temperature change. The dynamic range and sensitivity of the sensor were analyzed and presented.
Department, Program, or Center
Microsystems Engineering (KGCOE)
Bellil, Hedi and Abushagur, Mustafa, "Heterodyne detection for Fiber Bragg Grating sensors" (2000). Elsevier - Optics & laser technology, Vol. 32 (No. 5),Accessed from
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