Analysis of ternary layer photonic band gap tunable filters for wavelength division multiplexing applications

Abstract

In this paper, we have proposed a ternary layer photonic band gap structure as a versatile optical filter for various WDM applications. The design of a versatile optical filter has been done using Photonic Band Gap (PBG) structure for all Wavelength Division Multiplexing (WDM) applications including Coarse Wavelength Division Multiplexing (CWDM) and Dense Wavelength Division Multiplexing (DWDM). The proposed optical filter is a one-dimensional ternary periodic structure with a linearly periodic refractive index profile. It can be tuned by varying lattice parameters and angle of incidence. The filters are designed in the S band of EM spectrum, around 1310 nm wavelength, which can be used in CWDM applications at transmitter and receiver side of the network. Similarly in the C-Band of EM spectrum, near 1550 nm wavelength, filter with 0.4 nm pass band are designed. For DWDM applications, separation between neighboring wavelength channels is less than 1 nm and so the width of the pass band of an individual filter must be less than 0.5 nm. Therefore the filter designed for the C band can be used in DWDM applications. Thus the proposed filter design technique covers all the different ranges of WDM applications. © Copyright 2017 by American Scientific Publishers.