A novel DWDM device based on Silicon Photonic Crystal (PC) slab is proposed. Hexagonal ring resonators are used for channel dropping purpose. Channel dropping is achieved by fine tuning of lattice constant inside the ring resonators. The device is designed in such a way that the demultiplexed wavelengths are in C band of electromagnetic spectrum where EDFA is applicable. An average channel spacing of 0.8 nm is obtained and the maximum cross talk between the adjacent channels is found to be a fraction of 0.07 of the applied input intensity. The coupling efficiency of the input power to the channels is observed to be 60%. Approximate footprint of the device is found to be 475 µm2.