Design of optimized Structure resonant defects with enhancement ultra-narrow communication channels in Two-Channel De-multiplexer wavelength photonic Crystal to decrease of Crosstalk

In this paper, to decrease of crosstalk phenomenon at de-multiplexer two-channel of optical communication, we designed a de-multiplexer two-dimensional (2D) photonic crystal (PhC) using resonant line defect cavity and by removing four defects. In this research, we reached to decrease in crosstalk phenomenon with mean of -24.681 dB in photonic crystal two-channel de-multiplexer according to ultra-narrow bandwidth mean of 0.25 nm and quality factor Q with ultra-average amount of 6546.5. PWE calculation methods were used to obtain band structure and photonic band gap and FDTD numerical calculation method was used to obtain output spectrum of photonic crystal two-channel de-multiplexer.