Collision-free Fault Tolerant Multistage Interconnection Networks Based on Wavelength Division Multiplexing

In this paper, the performance of the extra stage Omega (ESO) networks based on wavelength division with limited number of buffers and wavelength converters was analyzed. Since the ESO networks suffer from the problem of internal blocking, therefore, the goal is to minimize the dropping probability by utilizing the available buffers and wavelength converters in the central controller of these networks. The advantage of ESO over the Omega networks is that there is a redundant path from any source to any destination. Having an additional path gives packets more flexibility, thus reducing the probability of packet buffering or dropping.