APSS is the first-ever commercial design tool for photonic integrated circuits. The full integration of material, waveguide, device and circuit modeling is offered in an easy to use hierarchical framework. The material module provides device designers with extensive material models including the effects of temperature, doping, and composition. The waveguide module deals with the cross section of a structure and gives the solution of optical waveguide modes. The device module gives the propagation solutions such as MMI by BPM and/or FDTD. Users can easily design AWG using predefined templates. Users can choose suitable options depending upon their purposes and cost effectively build up CAD system.