LAUSR

This paper takes account of the design of 4 and 5 two-dimensional photonic crystal demultiplexers (2D PC DMUXs) and their performance analysis using quasi hexagonal ring resonators. The suggested DMUXs are composed of bus/drop waveguides, power splitters, modified quasi hexagonal ring resonators and two 120 ° bend waveguides. In this design, using a suitable matching between the ring resonators and the waveguides, optimization of control parameters, including the radius and the refractive index (hereinafter referred to as RI) of the inner rod and the coupling rods of the ring resonators, positioning and the radius of the scattering rods, optical transmission efficiency, quality factor, channel spacing, crosstalk and the resonant wavelength of each channel are managed. The average quality factor, optical transmission, spectrum width, channel spacing, maximum and minimum crosstalk are 6661, 96.25%, 0.21 nm, 1.93 nm, −18.16 dB, and − 35.7 dB, respectively for the suggested 4-channel DMUX; and 9125, 90%, 0.16 nm, 1.7 nm, −16.12 dB, and – 40.1 dB, respectively for the suggested 5-channel DMUX. The footprint of our DMUXs is around 681μm2 which is suitable for integrated optics for future all optical communication networks. To determine the photonic band gap (PBG) and the normalized transmission of our structures, the plane wave expansion (PWE) and the finite difference time domain (FDTD) methods are utilized, respectively.