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Different routing schemes for multi-layer and multidomain optical networks are analyzed, and a novel routing architecture is described in the paper. Cooperation models between dual routing engine in large-scale multi-layer and multidomain optical networks are researched, and an optimal model is proposed and simulated. Then the scalability of dual routing engine architecture is validated on DRE testbed.
In the present paper we describe the feasibility of Data Vortex architecture in reverse direction. The routing and the possible hardware model of the node switch have been discussed. A comparative study on reachability and fault tolerance is presented in both forward and reverse direction. Also, enhancement of fault tolerance using multiplexers has been calculated. The terminal reliability of the...
In automatically restorable optical networks, the control plane has to detect a failure and send traffic through recovery paths. A successful restoration is guaranteed if an appropriate number of spare resources is available in the network. Usually a quality of transmission (QoT) estimator helps estimate the number of opto-electronic devices to guarantee transparent connection, within a given confidence...
Traditional protection schemes guarantees 100% reliability in case of single link failure which demands resources while differentiated reliability provides a granular protection scheme. Moreover, if the signal quality in a path is below acceptable values, a path cannot be used by incoming requests for lightpath establishment. Therefore, the signal quality needs to be checked by the routing and wavelength...
This paper presents the design architecture of a new optical switching device named Protection Switching Device (PSD) for providing protection and restoration against fiber failures/faults in the distribution region of passive optical network (PON). The developed PSD prototypes are employed at the customer end, just before the optical network units (ONUs) to ensure the data flow continuously due to...
In IP-over-WDM networks, wavelength circuits are often protected by dedicated backup circuits. Especially with future deployment of 100 G transmission systems, there will be huge under-utilization of backup resources. Network utilization can be boosted by loaning the idle backup circuits to preemptible IP/packet services. In the event of a failure, IP traffic can be pre-empted and wavelength backup...
This paper discusses two challenges, failure recovery enhancement and scalability enhancement, on optical network control plane. These challenges enable us to provide optical networks with high reliability and lower operational cost.
We propose a novel hierarchical optical path network design algorithm ensuring wavelength path protection. The effectiveness of the waveband networks that adopt waveband or wavelength path protection are elucidated compared to single layer optical networks.
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...
To guarantee a high switching speed, routing in vertically stacked optical banyan (VSOB) networks needs special attention so that connections are established as fast as possible. Previously proposed Pruned Vertically Stacked Optical banyan (P-VSOB) networks used Plane Fixed Routing (PFR) algorithm, and has O(log2N) time complexity. Blocking probability has also been analyzed for these kinds of networks...
The agile all-photonic network (AAPN) is a network that uses time division multiplexing (TDM) to better utilize the bandwidth of WDM systems. AAPN uses agile all-photonic switches as advances in the photonic switching technology made the design of all-photonic devices with switching latency in the sub-microseconds feasible. It proposes a simplified overlaid star network architecture that is deployable...
Carrier networks are gradually adopting a network model that consists of MPLS-capable routers and OXCs interconnected by high bandwidth WDM links for transporting IP and Ethernet traffic. A control plane can be used to deliver dynamic circuit provisioning in the transport layer, as well as bandwidth provisioning and traffic engineering in higher layers. Globalization drives the quest for end-to-end...
This paper describes a routing protocol for the agile all-photonic network (AAPN). The protocol disseminates topology, reachability, and link state information to the edges of the network. The protocol facilitates building nodal routing tables at the edge nodes. A nodal routing table consists of two tables. Table one contains reachability information that allows an edge node to look up all the edge...
This paper discusses two challenges, multiple failure recovery and scalability enhancement, on GMPLS control plane. These challenges enable to provide high reliability and lower operational cost on future optical networks.
This paper deals with the problem of survivable routing and wavelength assignment in layer 1 virtual private networks (VPNs). The main idea is link-disjointly routing the selected lightpaths specified by the customer. The customer identifies some sites or some connections, and their related lightpaths are routed link-disjointly through the providerpsilas network. Selective survivability gives the...
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