In this paper, the filterless optical network concept\nis presented and explored through a number of filterless\nsolution examples. In the first part, the filterless network\nconcept is presented and analyzed through a comparative\ncase study. In the second part, the filterless network\ndesign problem is defined and a filterless network design\ntool based on metaheuristics is presented. In the third part of\nthis presentation, filterless network solutions are proposed\nfor a number of core network topologies and compared to\nactive photonic network solutions from the point of view of\ncost and performance. The results show that cost-effective\nfilterless solutions can be found for different network sizes\nand topologies. The results of a comparative study show that\nfilterless networks represent a cost-effective and reliable alternative\nto active optical switching network solutions.
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