2D-photonic crystal based demultiplexer for WDM systems

This thesis investigates and enumerates the Two Dimensional Photonic Crystal (2DPC) square lattice structure based WDM Demultiplexers using Quasi Square Ring Resonator (QSRR). The periodic array of inner rods located inside the QSRR whose shapes and refractive index justify the resonant wavelength of the channels. The channels are dropped at output ports with different resonant wavelengths by altering the size and refractive index of cavity. Typically the resonant wavelength of the channel is shifted to higher wavelength while increasing the dielectric strength of the QSRR. The dielectric strength of the QSRR is altered by varying the inner rod radius which reflects the size of the air gap. The Finite Difference Time Domain (FDTD) method is utilized to analyze the functional parameters of the structure such as the resonant wavelength transmission efficiency Q factor spectral width channel spacing and crosstalk.