Design and Simulation of an Eight-Channel Demultiplexer Based on Photonic-Crystal Ring Resonators
نویسندگان
1 Department of Electrical Engineering, Shab.C., Islamic Azad University, Shabestar, Iran.
2 Department of Electrical Engineering, Shab.C., Islamic Azad University, Shabestar, Iran.
3 Department of Electrical Engineering, Shab.C., Islamic Azad University, Shabestar, Iran.
4 Department of Electrical Engineering, Shab.C., Islamic Azad University, Shabestar, Iran.
doi
10.22075/mseee.2025.37588.1209چکیده
In the present study, an eight-channel photonic crystal wavelength demultiplexer is designed for separating eight telecommunication wavelengths: λ₁=1.5552 nm, λ₂=1.5563 nm, λ₃ =1.5579 nm, λ₄=1.5593 nm, λ₅ =1.5608 nm, λ₆ =1.5623 nm, λ₇ =1.5638 nm, and λ₈ =1.5653 nm. To this end, a two-dimensional photonic crystal structure composed of circular silicon rods arranged in an air background and fabricated on a silica (SiO₂) substrate is employed.The design and analysis are performed using the Plane Wave Expansion (PWE) method to compute the photonic band structure and guided modes, while the Finite-Difference Time-Domain (FDTD) method is used to calculate transmission efficiency and analyze propagation characteristics during wavelength-selective separation. Ultimately, by optimizing the resonator placement and the radius of point defects, a channel spacing of 1.44 nm and a transmission efficiency (TE) of 93% were achieved.
