In recent years, telecommunication networks have experienced a drastic increase in traffic, which calls for the implementation of novel techniques for switching. With this aim, the design of a state-of-the-art 1 x 3 Wavelength Selective Switch using Mach-Zehnder Interferometers and Contra Directional Couplers is presented. The proposed device operates in the S+C+L bands, using 8 channels per band. To accomplish the device implementation, Silicon Photonics technologies will be employed. In the process towards its full realization, first, a novel architecture for the design of the physical layout will be developed. Within it, the band and channel treating of the signal are performed at specific physical blocks.