Design and Simulation of an Eight-Channel Demultiplexer Based on Photonic-Crystal Ring Resonators

In the present study, an eight-channel photonic crystal wavelength demultiplexer is designed for separating eight telecommunication wavelengths: λ₁=۱.۵۵۵۲ nm, λ₂=۱.۵۵۶۳ nm, λ₃ =۱.۵۵۷۹ nm, λ₄=۱.۵۵۹۳ nm, λ₅ =۱.۵۶۰۸ nm, λ₆ =۱.۵۶۲۳ nm, λ₇ =۱.۵۶۳۸ nm, and λ₈ =۱.۵۶۵۳ 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 ۱.۴۴ nm and a transmission efficiency (TE) of ۹۳% were achieved.

کلیدواژه ها:

Optical Demultiplexer ، Channel Spacing ، Crosstalk ، Ring Resonator