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The OTN over WDM network is one of the best solutions of the transmission network. How to manage the cross-connects capacity of the OTN node is a key problem in the OTN over WDM network. In this paper, an OTN over WDM numeric model is proposed to solve the OTN LIU placement problem. Based on the numeric model above, three multi-layer traffic grooming algorithms (OC-DKI, OC-DIK and OC-DIKP) are also...
Optical networks, with their high bandwidths and low latencies, are excellent to support Grid applications, esp. those arising in so-called eScience applications. In this paper, we consider the resulting so-called optical grids.We address the issue of resiliency against network failures and show how the Grid-specific anycast principle can be exploited in providing shared protection. Since in Grid...
A new networking approach based on IP/optical OFDM technologies is proposed, providing an adaptive mechanism of bandwidth provisioning and pipe resizing for dynamic traffic flows. A comparison study is presented to demonstrate its advantages.
Protected circuits provisioning on an optical network based on ROADMs is demonstrated using a GMPLS control plane with physical impairments considerations (link attenuation and PMD). Therefore, messages exchanged between nodes related to signaling procedures and topological data flooding were altered, in order to carry the necessary information for WDM network control. To operate properly, a RWA algorithm...
Exploring the use of all-optical MEM switches on local area network (LAN) to increase bandwidth and reduce energy cost has received increasing attention. Compared to traditional electronic switches, an all-optical switch provides higher bandwidth, less energy cost and cheaper wiring. Once the optical port count per switch becomes a resource constraint, an all-optical switched core can change the network...
Generalized Multi-Protocol Label Switching (GMPLS) based optical networks are viewed as a promising network infrastructure for the next generation network (NGN) development. By pre-configuring the resources of dynamic optical networks, we can reconstruct the physical topology, thus increase the number of direct routes between potentially heavily loaded physical node pairs and optimize the performance...
Optical Packet Switching (OPS) technologies are among the most promising solutions for next generation Internet. In this paper, we address quality of service (QoS) and fairness issues in a novel OPS ring architecture with a slotted synchronous transmission mode. The basic MAC protocol in the studied architecture is similar to the CSMA/CA mechanism. Using this mechanism, each node in the network may...
We propose an improved postponed lightpath teardown (PLT) strategy by introducing a lightpath splitting mechanism in multi-layer optical networks. Results show that the proposed strategy achieves higher utilizations of both wavelength-links and transceivers under different scenarios of load and transceiver number, and significantly reduce the blocking probability (CBP).
Survivability is a key concern in modern network design. This paper investigates the problem of survivable dynamic connection provisioning in general telecom backbone networks, which are mesh structured. We assume differentiated services where connections may have different availability requirements, so they may be provisioned differently with protection (if needed) based on their availability requirements...
We investigate methods for periodic capacity upgrades (namely Network Engineering) to handle traffic growth in optical WDM mesh networks. Significant cost savings can be achieved by upgrading capacity of appropriate links at appropriate times.
Virtual topology design is an efficient approach to tackle the traffic-grooming problem which multiplexes low-granularity demands into high-granularity pipes in optical networks. But it is hard to deal with the demands with various physical constraints. In this paper, we propose a packing grooming with partial-combination algorithm (PPA) to address this issue. The PPA first routes low-granularity...
In the wavelength division multiplexing (WDM) optical networks, user's requirement is much less (in Mbps range) than the capacity of a wavelength channel (in Gbps range) and number of wavelength channels is limited in a fiber due to several constraints. Each wavelength channel between end nodes requires a pair of transmitter and receiver for digital to optical conversion. In order to decrease the...
Besides the capacity increasing optical technology will change the network structure. The layering is simplified by IP over optics and topology is changed by enlarged access areas and by functional optimisation of aggregation and backbone.
Since the optical wireless communication (OWC), also known as free space optical (FSO), link can provide more than lGbps (e.g., 2.5 Gbps) bandwidth over a long distance, the OWC network is envisioned as an affordable alternative solution to satisfy the increasing bandwidth demand of streaming, multimedia, and gaming applications at home environments. Among the primary advantages of OWC system are...
The network coding paradigm has become an effective method for achieving efficient multicast in communication networks. The optical community has just started to venture into the application of network coding in optical networks. However, a number of challenges need to be overcome before network coding can be used in optical networks. These include limited buffering and processing capabilities as...
This paper describes a new path computation model in Multi-protocol Label Switching (MPLS) and Generalized MPLS (GMPLS) networks. It introduces a path computation element (PCE), which is functionally separate from label switching routers (LSRs). The Path Computation Element (PCE) is an entity that is capable of computing a network path or route based on a network graph, and applying computational...
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