Design of Photonic Crystal Polarization Splitter on InP Substrate

In this article, we suggested a novel design of polarization splitter based on coupler waveguide on InP substrate at ۱.۵۵mm wavelength. Photonic crystal structure is consisted of two dimensional (۲D) air holes embedded in InP/InGaAsP material with an effective refractive index of ۳.۲۶۳۴ which is arranged in a hexagonal lattice. The photonic band gap (PBG) of this structure is determined using the plane wave expansion (PWE) method by RSOFT Bandsolve software.  Band diagram also show an overlap of two photonic bandgaps for both TE and TM about ۱.۵۵ mm wavelength. Also, the band structure is calculated for a lattice constant of ۶۲۵ nm and a radius of ۲۶۶.۶ nm. The proposed polarization splitter has a transmission spectral of ۷۵% and ۷۰% for the TE and TM polarized light, respectively. The proposed polarization splitter is realized in a standard semiconductor technology on InP substrate at ۱.۵۵ µm wavelength and can be easily monolithically integrated with other planar integrated circuits.

Keywords:

directional coupler , polarization splitter , Photonic Crystal , InP materials