Photonic Crystal Waveguide For High-Frequency Filtering And Polarization Control In Optical Communications

In this work, photonic crystal waveguides are studied and examined to perform high-frequency filtering and mode-splitting functions in optical networks. The waveguides are modeled numerically and their behavior is analyzed using the finite element method. The parametric sweep optimization method is used to calculate the design parameters. The results show that crystal waveguides can be effectively used as high-frequency filters and mode splitter, with high filtering efficiency and acceptable isolation of the Transverse Electric (TE) modes. In high frequencies (200 THz), this filter allows light to propagate with a low loss compared to other wavelengths. This means this structure can be used for wavelength drop filters in the Wavelength Division Multiplexing WDM systems. This model allows Transverse Magnetic (TM) modes to propagate with TE mode rejection. The power flow of the Electromagnetic EM waves is presented and compared. The TM wave passes to the other side of the filter with a relatively small attenuation (-5 dB). Photonic Crystal (PhC) waveguides can be used to design effective high-frequency filters and mode control devices in communications systems. The research outcomes reveal that PhC waveguides offer acceptable performance and provide a promising basis for developing new applications.