Design and simulation of 1×2 Optical Wavelength Division De-multiplexer by using line defect photonic crystal resonator

In this paper, the structure of a 1×2 Optical Wavelength Division De-multiplexer (WDDM) has been designed by using line defect photonic crystal resonator. The Gallium Arsenide (GaAs) rods with refractive index 3.376 are used as hexagonal lattice 2D photonic crystal in the proposed structure, which are suspended in the air. Optical Wavelength Division De-multiplexing is obtained by using line defect resonators for two wavelengths at 1350nm and 1530nm. The de-multiplexed wavelengths 1350nm and 1530nm lies in the optical wavelength band O (Original) and C (Conventional). The C band has been a gift to optical communication, being a region of very low losses that facilitate very efficient optical amplification. The proposed structure provides two wavelengths which are very close to optical window II (1310nm) and window III (1550nm). These de-multiplexed wavelengths can be used as to show the concept of Dispersion Shift. The simulation of photonic band gap and results is obtained by utilizing the Plane Wave Expansion (PWE) and Finite Difference Time Domain (FDTD) methods respectively. The transmission is achieved more than 90%.