This paper demonstrates how a complex grating coupler design can be efficiently designed and optimized with a 2D decomposition and then validated by 3D simulation using the RSoft photonic simulation tools. To download this white paper, please complete the *required fields before clicking the. CMT simulation tool for complicated fiber and integrated waveguide grating devices Optimize the performance of your photonic applications with RSoft GratingMOD CMT, a general design tool that rapidly simulates complicated grating profiles in optical fibers and integrated waveguide circuits.