Telecommunication filter based on the symmetrical photonic crystal Bg5/Cu1/Bg5

Thanks to the transfer matrix method, we perform a theoretical investigation of the optical properties of the symmetrical photonic crystal designed as Bg₅/Cu₁/Bg₅, where Cu₁ is the first generation of the copper mean sequence and Bg₅ is the fifth generation of the Bragg sequence. We design a developed polychromatic filter which allows the transmission of all the telecommunication wavelengths 0.85, 1.3, and 1.55 µm at oblique incidence for both of TE and TM polarization with a high transmission rate and high quality factor. This photonic crystal can be employed in the fabrication of telecommunication devices.