Advanced Optics Solutions GmbH Homepage - Fiber Bragg Gratings, Fiber Bragg Gratings (FBG) are basic components in optical communications and optical sensing of strain or pressure or temperature. AOS offers a number of telecommunication devices and optical Bragg grating sensor products. Fiber Bragg gratings for telecommunication are acting as filter, in-fiber cavity, or wavelength reference. Bragg sensors are optical fiber sensors. The propagating light is split at the active part into a transmitted part and into a reflected part. The center frequency of the.