Design of channel ADD Drop filter using photonic crystal ring resonator

In this paper various design of channel ADD Drop filter using photonic crystal ring resonator is investigated. In design I, ADF based on quasi-square PCRR with circular scatters is proposed and analysed for optimized performance. This device consists of rectangular waveguides and a quasi-square PCRR. A good wavelength selective filter with bandwidth about 10.20nm and centre wavelength of pass band 1.4201um is achieved. In the next design, photonic crystal quasi-square cavity based ADF is realised with elliptical scatters for different major and minor axis configurations thus having different ellipticity. It is observed that the output response of the filter is very sensitive to the dimensions of coupling rods and scatter rods. It is observed that when the radius of the scatter rods is increased, then the centre wavelength of the bands get shifted towards higher wavelength range.