The Theoretical Study Of Active Chalcogenide Photonic Crystal Waveguide

In recent years, with the development of optoelectronics and digital communication business, human society is entering into an information age. Active optical waveguide devices whose function is to compensate signal losses in all optical communication networks, owning the characteristics of miniaturization, high integration and huge communication transmission capacity, have become a research hotspot. In addition, Photonic crystals (PCs) can provide high-degree light confinement through their band gaps. The light having frequency within the photonic band gap (PBG) is allowed to travel along a linear defect in the crystal. The photonic crystal waveguides (PCW) have an obvious advantage over the conventional waveguides confining light by total internal reflection in realizing large-radius bend with low loss.The purpose of this paper is to design an active2D photonic crystal waveguide in chalcogenide material Ga-La-S. The photonic crystal waveguide can allow light to travel at both wavelengths of1550nm for signal and980nm for pump. Through the theoretical analysis and calculation of PBG by using the plane wave expansion method and the finite difference time domain method, and the simulation by Rsoft, we can get the expected structure and the photonic crystal waveguide by introducing a line defect. Through the simulation of photonic bandgap of the waveguide, two localized defect modes are found to match the980nm pump light and1530nm signal light respectively. At last, Transmission characteristics of pump and signal light have been simulated in the photonic crystals (line waveguide and bend waveguide). Results show that these two wavelengths light can transfer in the designed photonic crystal waveguide well.