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I. INTRODUCTIONT HE optical implementation of Optical Multistage Switching Networks (OMSNs) has been widely studied by researchers. Several architectures have been studied, proposing various implementations based on different transmission media (including fiber, waveguide and free-space optics) and relying upon various types of components (e.g., MEMS, microring resonators, directional couplers, etc.) used as switching elements.Recently, research on Optical interconnections is casting new light on optical switching, and in particular on OMSNs. Optical interconnections is the conventional term that indicates the usage of photonic systems to interconnect several optoelectronic high-speed transmitters and receivers located at short distance from one another. "Short" means in general the range of distances separating subsystems within a system, and

Multi-stage switching is very suitable for implement-ing interconnection systems operating at different physical scale (from rack-to-rack to on-chip) and with several technologies (either photonics or electronics). Several multistage architectures have been proposed to design these systems in a highly modular and efficient way. Since these proposals are general and appli-cable to a vast range of technologies, optimizations are possible once a specific technology is considered. In this work we aim at optimizing multi-stage banyan and EGS architectures in case of optical waveguide technology implementation. We propose a method to decrease the number of waveguide crossovers, while avoiding an excessive increase of waveguide bends.