Fiber bragg gratings a fiber bragg grating is written in a fiber (n=1.5) with a strength = 2em and length = 2 cm at 2=1550nm. a) what is the bandwidth of the grating in nm? b) what is the reflectivity (in %) and transmission (in db)? c) if this grating were written in birefringent fiber where the difference in refractive index for the two polarizations, an = 10, what is the separation in grating wavelengths for the two polarizations? d) will this grating be any good for filtering unpolarized light?