The Coupling Of Distributed Bragg Reflector And Grating

In 1987, the concept of Photonic Crystals was proposed by S. John and E. Yablonovitch. Photonic crystal is composed of dielectric materials with different refractive index, and there are three types, i.e. one-, two- and three-dimensional photonic crystals. Bragg reflector Distributed is a kind of common one-dimensional photonic crystal. Because of sensitive temperature and strain response and good filtering characteristics, it has been widely used in the field of sensing, measuring and communication. In this paper, we use the grating to modify the DBR to realize the comb transmission spectrum. The grating is a classical optical element, the development is mature. The optical properties of the two are combined by controlling the grating structure and the distributed bragg reflector. In theory, the multimode coupling transfer matrix method is adopted.In the present study, the grating is located on the surface of DBR. Due to the effect of the grating, the optical transmission of DBR exhibits a comb like structure in the band gap. We investigate the dependence of the comb like transmission with the grating and the DBR. It is found that the number density of the transmission peaks increases and full width at half height decreases with the increase of the DBR number. In addition, transmission comb has a weak dependence on the defects of DBR. The transmission spectra maintain their comb-like forms at least up to 15%.