Designing Optimal Filter with Hexagonal Structure to Reduce Two-Channel Communication Demultiplexer Crosstalk Phenomenon with Optical Wavelengths Resolution Technology in Structure of Photonic Crystal

In this research crosstalk phenomenon in DWDM two-channel communication demultiplexer was reduced by optimizing ۲D photonic crystal network structure and using resonant cavity. Alongside with reduction in crosstalk phenomenon by mean of -۱۹.۷۴ dB, also the average bandwidth Δλ of ۰.۲ nm and mean transmission range of ۹۳.۴۷%, the average value of quality factor ۷۸۲۹.۲۵ was reached. In these calculations using finite difference time domain method (FDTD), optimized structures of ۲D DWDM two-channel communication demultiplexer photonic crystals to reduce crosstalk phenomenon was obtained.