This review provides a comprehensive overview of FBG sensor technology, focusing on their operating principles, key advantages such as high sensitivity and immunity to electromagnetic interference, and common challenges like temperature-strain cross-sensitivity and the high. This review provides a comprehensive overview of FBG sensor technology, focusing on their operating principles, key advantages such as high sensitivity and immunity to electromagnetic interference, and common challenges like temperature-strain cross-sensitivity and the high. This page describes the structure, working operation, advantages, and disadvantages of a Fiber Bragg Grating (FBG) Sensor. Fiber optic sensors work by modulating one or more properties of the light wave, such as intensity, phase, polarization, and frequency. An optical fiber typically consists of a. Fiber Bragg grating (FBG) sensors have emerged as advanced tools for monitoring a wide range of physical parameters in various fields, including structural health, aerospace, biochemical, and environmental applications. Bragg gratings are one of the most useful, reliable, versatile, practical, and attractive passive devices in the fields of optical fiber. Fiber Bragg gratings are periodic variations in the refractive index inscribed along the core of an optical fiber. These variations are created using a process involving ultraviolet laser irradiation.