Adjustable Filters For Optical Communications Systems Based On One-Dimensional Photonic Crystal Structures

摘要

IN this paper design and simulation of all optical filters have been done by one-dimensional photonic crystal structures based on some materials like Silicon (Si) and Germanium (Ge). By using of Transfer Matrix Method (TMM), optical fiber with too narrow bandwidth is gained. Also the defect effect has been studied in frequency feature of filters and it has been showed that by replacing defects in suitable places of designed structure, bandwidth and central frequency face changes that we can regulate their parameters according to application type of filters. Also by increasing the number of layers, bandwidth of filter decrease. One of the most important advantages of this structure is having some passing-bands. Wave length limits of mooted structure are about one micrometer