Multistage Interconnection Networks (MINs) provide the required switching infrastructure for many shared-memory multiprocessor systems and telecommunication networks. The concept of Super-networks is evolving in response to emerging computation and communication intensive applications. Supernetworks exploit parallelism in both computing resources and communication infrastructures by interconnecting several computing clusters via high-bandwidth communication links. Wavelength Division Multiplexing (WDM) technology provides the communication infrastructure for Supernetowrks by dividing the bandwidth of a single fiber into numerous channels that can be used independently. In this paper, we investigate several architectures for WDM MINs that enhance the Supernetworks switching infrastructure. Our objective is to propose a new architecture and to evaluate its hardware complexity by comparing it to other WDM MINs architectures.