Abstract
In this work, we designed an optical demultiplexer based on 2D photonic crystal filters to separate six and twelve wavelengths. As the resonance wavelength depends of the radius of filters, therefore, six and twelve filters with different values of radii are used to select channel's wavelength. When the radius of filters increases the wavelength at resonance is shifted to the higher values. In this work, many parameters are used to evaluate the performances of optical multiplexers such as: quality factor, crosstalk, structure size and the number of channels. The maximum values of quality factor, the average crosstalk and footprint are 3583.95, -28.06 dB and 370 µm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> , respectively. The finite difference time domain (FDTD) and plane wave expansion (PWE) methods are used to calculate the output spectrums and band gap, respectively.
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