Article

GMPLS-controlled dynamic translucent optical networks

IEEE Network (Impact Factor: 3.72). 07/2009; 23(3):34 - 40. DOI: 10.1109/MNET.2009.4939261
Source: IEEE Xplore

ABSTRACT The evolution of optical technologies has paved the way to the migration from opaque optical networks (i.e., networks in which the optical signal is electronically regenerated at each node) to transparent (i.e., all-optical) networks. Translucent optical networks (i.e., optical networks with sparse opto-electronic regeneration) enable the exploitation of the benefits of both opaque and transparent networks while providing a suitable solution for dynamic connections. Translucent optical networks with dynamic connections can be controlled by the GMPLS protocol suite. This article discusses the enhancements that the GMPLS suite requires for the control of dynamic translucent optical networks with quality of transmission guarantees. Such enhancements concern QoT-awareness and regenerator-awareness and can be achieved by collecting and disseminating the information on QoT and regenerator availability, respectively, and by efficiently leveraging such information for traffic engineering purposes. More specifically, the article proposes two distributed approaches, based on the routing protocol and the signaling protocol, for disseminating regenerator information in the GMPLS control plane. Moreover, three strategies are introduced to efficiently and dynamically designate the regeneration node(s) along the connection route. Routing and signaling approaches are compared in terms of blocking probability, setup time, and control plane load during provisioning and restoration.

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    • "Figure 1 shows the existing optical network layers wherein; the OCP is responsible for TE, route computation and signaling ; while the data plane is responsible for switching the data belonging to different connections based on OCP instructions. However, standard GMPLS does not account for the QoT, regenerator and AOWC information and hence, no solutions have been standardized yet for the issue of encompassing QoT, regenerator or AOWC information within the GMPLS-controlled translucent networks [7]. "
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    ABSTRACT: number of available regenerators and all-optical wavelength converters (AOWCs) is of paramount importance. How-ever, current generalized multiprotocol label switching (GMPLS) protocol suite does not consider the distribution of regenerator and AOWC availability information to all the network nodes. In this paper, we propose a novel optical con-trol plane (OCP) architecture that 1) disseminates information about network components (i.e. regenerators and AOWCs) to all the network nodes, and 2) evaluates candidate routes which use fewest amounts of network components. Performance of the proposed OCP is compared with a recently proposed hybrid OCP approach in terms of blocking performance, number of deployed components and lightpath establishment setup times. The obtained simulation results show that the proposed OCP approach demonstrates low connection blocking and establishes lightpaths by 1) minimiz-ing the overall network cost owing to the deployment of minimum total number of network components, and 2) demonstrating acceptable lightpath establishment setup times at all traffic loads. Further, the proposed OCP methodology is compatible and suitable for controlling the operations of a novel electro-optical hybrid translucent node which is a latency efficient technology capable of delivering a cost effective implementation suitable for large scale deployment.
    Communications and Network 12/2013; 05(5):57-68. DOI:10.4236/cn.2013.51006
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    • "The de-facto Generalized Multi-Protocol Label Switching (GMPLS) based OCP, however, does not account for the QoT, regenerator and AOWC information. Hence, no solutions have been standardized yet for the issue of encompassing QoT, regenerator or AOWC information within the GMPLScontrolled translucent networks [6]. The presence of regenerators and AOWCs necessitates the OCP to decide on which regenerators and/or AOWCs to be used while setting up 1) a translucent lightpath or 2) an end-to-end lightpath composed of multiple transparent sections. "
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    ABSTRACT: In a translucent wavelength division multiplexed (WDM) network, development of an optical control plane (OCP) that is aware of the location and number of available regenerators and all-optical wavelength converters (AOWCs) is of paramount importance. However, generalized multiprotocol label switching (GMPLS) protocol suite does not consider the distribution of regenerator and AOWC information to all network nodes. In this paper, we propose an OCP architecture which disseminates regenerator and AOWC information to all the network nodes. The Physical Layer Impairment-Signal Quality Aware Routing and Wavelength Assignment (PLI-SQARWA) algorithm is employed for RWA. The electro-optical hybrid translucent nodes have been employed which, from a practical perspective, are based on limited range wavelength converters (LRWCs). Performance of the proposed limited range OCP (LR-P-OCP), is compared with the full range OCP (FR-P-OCP) and the hybrid OCP (H-OCP) approach.
    NCC 2013; 02/2013
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    • "The de-facto Generalized Multi-Protocol Label Switching (GMPLS) based OCP, however, does not account for the QoT, regenerator and AOWC information. Hence, no solutions have been standardized yet for the issue of encompassing QoT, regenerator or AOWC information within the GMPLScontrolled translucent networks [6]. The presence of regenerators and AOWCs necessitates the OCP to decide on which regenerators and/or AOWCs to be used while setting up 1) a translucent lightpath or 2) an end-to-end lightpath composed of multiple transparent sections. "
    [Show abstract] [Hide abstract]
    ABSTRACT: In a translucent wavelength division multiplexed (WDM) network, development of an optical control plane (OCP) that is aware of the location and number of available regenerators and all-optical wavelength converters (AOWCs) is of paramount importance. However, generalized multiprotocol label switching (GMPLS) protocol suite does not consider the distribution of regenerator and AOWC information to all network nodes. In this paper, we propose an OCP architecture which disseminates regenerator and AOWC information to all the network nodes. The Physical Layer Impairment-Signal Quality Aware Routing and Wavelength Assignment (PLI-SQARWA) algorithm is employed for RWA. The electro-optical hybrid translucent nodes have been employed which, from a practical perspective, are based on limited range wavelength converters (LRWCs). Performance of the proposed limited range OCP (LR-P-OCP), is compared with the full range OCP (FR-P-OCP) and the hybrid OCP (H-OCP) approach.
    IEEE NCC; 02/2013
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