Born approximation in #40 breaks down for peak_reflectivity above ~0.5. For high-reflectivity gratings the proper treatment is coupled-mode equations or a transfer-matrix method, both of which capture the asymmetric and saturating spectral response. Quasi-distributed dense FBG arrays for sensing applications also fit here.
Born approximation in #40 breaks down for peak_reflectivity above ~0.5. For high-reflectivity gratings the proper treatment is coupled-mode equations or a transfer-matrix method, both of which capture the asymmetric and saturating spectral response. Quasi-distributed dense FBG arrays for sensing applications also fit here.