Method design gratings in optical fiber by varying the period of the network for application as optical filter.

摘要

Design method gratings in optical fiber by varying the period of the network for application as optical filter. Design method gratings Bragg fiber for application to filtering in the optical domain based on the variation of the period of the diffraction grating along the fiber axis, according to the function apodized to maintain constant Bragg condition throughout the structure. These networks have designed and improved filter characteristics in both amplitude and phase. Regarding the first, the spectral characteristic approximates to the ideal rectangular filter, having a high reduction in side lobes that produce crosstalk between channels in optical communication systems multiplexed wavelength. As for the phase characteristic, it almost gets a constant delay ideal and eliminates possible effects due to scattering.