Abstract
The two-dimensional photonic crystal (2D PC)-based wavelength division multiplexing (WDM) demultiplexer is an efficient device for the recent developments in optical communication system. Its size in the range of nanometer and periodic dielectric nature is ensured to provide low-loss, high-performance results. WDM demultiplexer splits out the channels with different frequency and low crosstalk. The performance parameters of 2D PC demultiplexer are resonant wavelength, transmission efficiency, Q factor, channel spacing, spectral width, and crosstalk. The demultiplexer is designed by introducing line, point, and surface defects in a 2D PC structure. The defects are used in a structure to design resonant cavity, ring resonator for CWDM (ITU-T G 694.2), and DWDM (ITU-T G 694.1) demultiplexer. The size of the cavity and ring resonator are deciding resonant wavelength, transmission efficiency, spectral width, channel spacing of the WDM channels. The effective use of numerical methods for the device simulation is a plane wave expansion (PWE) and finite difference time domain (FDTD).
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