This paper proposes a four-channel demultiplexer based on 2-Dimensional Photonic Crystal (2DPC) cavities and quasi-waveguide bends for Wavelength Division Multiplexing (WDM) and examines the performance parameters of the demultiplexer, such as transmission efficiency, passband width, Q-factor, and crosstalk. The proposed demultiplexer consists of a bus waveguide, drop quasi-waveguide bends, and cavities, in which the output ports are arranged in a way that reduces channel interference or crosstalk. When simulating the performance of the device, the Finite Difference Time Domain (FDTD) approach was used and the results showed an average transmission coefficient of 91.87%, a spectral width of 0.2 nm, and an average quality factor of 7,658.5. The device achieved crosstalk levels ranging from -18.69 dB (optimal performance) to -9.262 dB (minimum performance), optimizing it for high-performance Photonic Integrated Circuits (PICs) and optical communication systems.
A. Boudissa (Sat,) studied this question.