The design of large separating angle ultracompact wavelength division demultiplexer based on photonic crystal ring resonators

The paper presents the design and simulation of a new and large separating angle ultracompact wavelength division demultiplexer based on the coupling characteristics between the waveguide and ring resonators in two dimensional photonic crystals. The transmission properties of the wavelength division demultiplexers, which ring resonators are both located on the same or different sides of input waveguide, have been numerically studied using the finite difference time domain method. It is shown that a good wavelength selection performance, a high transmittance, a large separating angle and high efficiency of the output channels may be obtained in this flexible structure.