In this paper, we investigate the problem of survivable\nall-optical routing in WDM networks with physical\nimpairments. One of the recent key issues in survivable optical\nnetwork design refers to maximization of the ratio of\nrouteable demands while keeping the overall network cost\nlow. In WDM networks, this goal can be achieved by routing\nas many demands in all-optical way as possible. Based\non the latest technical trends driven by deployment costs,\ntechnical constraints, and backward compatibility, this will\nnot mean that all demands will be routed in all-optical way\nin the near future.\nNowadays, operators are mostly willing to dedicate only\na given ratio of their power budget to all-optical routing.\nThis in turn implies a new problem to be solved: operators\nhave to find a way to select demands that should be routed\nin all-optical way and which should not. The problem gets\neven more complicated, if we add demand protection issues.\nIn this paper, we introduce and evaluate methods able to\nmaximize the number of demands routed with protection in\nall-optical way in capacity-constrained networks with limitations\non path lengths according to physical impairments.
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