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In IP over WDM networks, lightpath bypass is an effective method of decreasing the power consumed by IP routers since this technology can multiplex many requests into one high-capacity lightpath and switch these requests as a single entity in all-optical layer. However, the power consumed by individual lightpaths should also be considered in IP over WDM networks. Therefore, the power efficiency has...
This paper studies the multicast survivability and proposes a new heuristic algorithm called Enhanced Multicast Hamiltonian Cycle Protection (EMHCP) to tolerate the single link failure in WDM optical networks. For each multicast demand, EMHCP computes a least-cost light-tree based on the presented link-cost function that considers the load balancing and the proper straddling link selection so that...
This paper studies the Hamiltonian cycle protection method in survivable WDM mesh networks and propose a new heuristic algorithm called differentiated Hamiltonian cycle protection (DHCP). Compared to conventional algorithm, DHCP obtains significant improvement in resource utilization ratio and blocking probability.
In this paper, we propose a new heuristic algorithm, protection based on survivable integrated auxiliary graph (PSIAG), to tolerate the single-link failure in waveband switching optical networks. The survivable integrated auxiliary graph (SIAG) contains single virtual topology layer and multiple waveband-plane layers, and it can well solve the routing and waveband assignment. In PSIAG, we can well...
This paper proposes a new heuristic algorithm called Traffic recovery time Constrained Shared Sub-Path Protection (TC_SSPP) to provide survivability in WDM networks with Shared-Risk-Link-Group (SRLG). By properly setting the delay parameter of each link and running the Delay Constrained Shortest Path Algorithm (DCSPA) to compute the backup sub-paths, TC_SSPP can effectively guarantee the traffic recovery...
This paper investigates the technique of waveband switching and considers the problem of reducing the number of ports in optical cross-connects in WDM optical networks. Based on previous studies, this paper proposes a new heuristic, in which the k-shortest path algorithm and rerouting scheme are used to optimize the number of ports. Simulation results show that the performance of proposed scheme can...
Previous research on survivability with differentiated reliability in wavelength-division-multiplexing (WDM) optical mesh networks mostly considered the failure probability of a fiber link with the link length that may not be a good solution for consideration of shared-risk link groups (SRLGs). In this paper, we propose a new model of failure probability with the SRLG constraints in WDM optical mesh...
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