These include reflectivity and transmission spectrum, bandwidth, average re-fractive index change and refractive index modulation coefficient, grating uniformity and quality of apodization, insertion loss, radiation loss, and group delay of chirped gratings, drift due to. These include reflectivity and transmission spectrum, bandwidth, average re-fractive index change and refractive index modulation coefficient, grating uniformity and quality of apodization, insertion loss, radiation loss, and group delay of chirped gratings, drift due to. A fiber Bragg grating (FBG) is a type of distributed Bragg reflector constructed in a short segment of optical fiber that reflects particular wavelengths of light and transmits all others. This is achieved by creating a periodic variation in the refractive index of the fiber core, which generates a. This is because this type offiber permits the construction of guided wave interferometers directly from the fiber itself. Interferometers can be used to measure small phase changes in light transmitted through the sensing region. reflectivity, bandwidth, and sidelobes' intensity for uniform and apodized (Gaussian, hyperbolic tangent, apod1, sine, and raised sine) fiber Bragg gratings (FBGs) were studied as a function of grating length and index modulation. The optimal grating length and.
