Design and Investigation of 2D Photonic Crystals based Optical Wavelength Demultiplexer

Photonic crystal demultiplexers play an important role in optical communication system because of their higher performance, compact structure, high capacity and less cross-coupling. In this paper based on analysis we demonstrate a 2D photonic crystal based ultra-compact wavelength demultiplexer for two optical windows. The proposed structure used for demultiplexing two optical wavelengths i.e. 1.31µm and 1.55µm. The structure uses hexagonal lattice structure with silicon rods(RI=3.47) suspended in air. The structure uses line and border defect in structure to provide a mean transmission efficiency of 94%. Also the cross-talk i.e. a very critical factor in demultiplexer devices is between -25.27db to -30.78db. The footprint of proposed device is about 86.86 µm² (10.1µm  8.6µm). The proposed wavelength demultiplexer is suitable for Nano- Photonic integrated circuits due to its ultra-compact structure, high transmission efficiency and low cross-talk level