Optimisation of Optical Demultiplexer Based on Photonic Crystal Resonant Cavities

The most important parameters can characterize the performance of optical demultiplexer are quality factor, channel spacing, crosstalk and number of channels. The improvement of these parameters is the top priorities of optical components design suitable for wavelength division multiplexing applications. In this work, we design a six channel optical demultiplexer based on 2D-photonic crystal. Wavelength selection is ensured with help of resonant cavity. The resonance wavelength of the cavities depends on the radius of the filters. The proposed device has a quality factor more than 3000, the crosstalk comprised between-26 and-93 dB and finally the size of the device is equal to 155 mu m(2).