Fiber Bragg Grating

A Fiber Bragg Grating (FBG) is a specific structure within optical fibers that reflects certain wavelengths of light while allowing others to pass through. This is achieved by creating a pattern of varying refractive index along the fiber, acting like a filter. FBGs are often used in telecommunications and sensing applications because they can measure changes in temperature, pressure, or strain. By analyzing the reflected light, engineers can gather precise information about the environment around the fiber, making FBGs valuable tools in various fields, including structural health monitoring and medical devices.