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Wavelength division multiplexing (DWDM ) based all-optical networks have since become the promising solution to the unprecedented increasing demands for bandwidth. However the continued use of electronic switch architectures/routers serves as bottlenecks solely because of the impairment between switching capability and transmission speeds as the earlier continues to lag quite significantly. In a bid to reduce switch bottlenecks, switch architectures that blend both horizontal expansion and vertical stacking of optical Banyan networks are seen to be the ultimate solution. However the resultant structures (horizontally expanded and vertically stacked switch architectures) are usually quite expensive because of the hardware redundancy required in order to guarantee the minimal to non-blocking property. High quality of service (QoS) consistency may also be compromised due to the presence of crosstalk contributed by the directional couplers (DCs) which themselves are the elementary building blocks of such architectures. In this paper we focus on evaluating the overall delay across such switching architectures.