Modelling of Grating based waveguide structures for Wavelength Division Multiplexing

The ability of grating based optical waveguide structures for Wavelength Division Multiplexing is demonstrated. In addition to the conventional function of an input grating coupled waveguide to couple an incident surface beam from an optical source like an optical fiber into a planar waveguide, a modified design to have a predetermined wavelength multiplexing response has been modelled and analysed. The structure is designed for 1550 nm wavelength and the separation between the wavelengths obtained is 10 nm. An improved waveguide structure of apodized grating profile along the waveguide is modelled for 1310 nm operation. There is a significant increase in the number of channels with an improved channel bandwidth.