Rouard's method modeling of type I-IR fiber Bragg gratings made using an ultrafast IR laser and a phase mask

摘要

Rouard's method is used to model the spectral response of type I-IR gratings. Type I-IR gratings are shown to have a broader bandwidth and larger sideband suppression than would be expected from standard type I UV-written gratings. These properties are related to the nonlinear dependence of the index change on intensity. At higher intensities the spectral response indicates saturation of the index change growth rate. (c) 2006 Optical Society of America.