The sampled uniform fiber Bragg gratings are theoretically analyzed and numerically simulated with the transfer matrix method.The study shows that with the increase of grating length and the decrease of sampling rate and refractive index modulation depth

the uniformity of reflective peak is improved.The reflectance of the side lobes is decreased slightly and the band width is obviously narrowed but the interval between two reflective peaks is maintained constant.The interval between reflective peaks is determined by grating period and is independent of sampling rate.On the basis of the special reflective spectrum characteristics for the sampled gratings

the structure diagram of the optical devices are studied.