Issues for routing in the optical layer

Strand, John; Chiu, Angela; Tkach, R.W.

doi:10.1109/35.900635

Cited by 391 publications

(230 citation statements)

References 2 publications

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“…where, δ represents the pulse broadening factor should typically be less than 10% of a bit's time slot for which the polarization mode dispersion (PMD) can be tolerated [12] and DS (i, j) = L (i, j) = ∞, when there is no link from i to j. The bandwidth matrix for an OVPN connection will be:…”

Section: Problem Formulationmentioning

confidence: 99%

QoS Aware Optical Virtual Private Network (OVPN)Analytical Control Plane Mechanism

Das¹,

Patra²

2012

IJCEE

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Abstract-Due to the demand of clients, the service provider network needs to provide functionalities such as dynamic OVPN connection provisioning, de-provisioning and rerouting in order to provide guaranteed Quality of service (QoS). In corporate with that, we present a centralized OVPN control mechanism over DWDM/GMPLS network based on the existing OVPN traffic. It is important to understand the process that provide the QoS information to the centralized Traffic control manager and use this information efficiently to compute feasible OVPN connection for the prospective of client OVPN connection requirements.

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Section: Problem Formulationmentioning

confidence: 99%

QoS Aware Optical Virtual Private Network (OVPN)Analytical Control Plane Mechanism

Das¹,

Patra²

2012

IJCEE

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“…where, δ represents the pulse broadening factor should typically be less than 10% of a bit's time slot for which the polarization mode dispersion (PMD) can be tolerated [10] and D (i, j) = L (i, j) = ∞, when there is no link between i th and j th node.…”

Section: Problem Formulationmentioning

confidence: 99%

Physical Layer Impairments Aware OVPN Connection Selection Mechanisms

Das¹,

Patra²

2012

IJCEE

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Abstract-In optical virtual private network (OVPN), the quality of connection depends not only on network layer information, but also on physical layer impairments (PLIs) constraints, which are incurred by non-ideal optical transmission media and accumulates along with the optical connection. It is important to analysis PLIs in-order to satisfy OVPN client's necessary requirement of QoS for their connection setup. In-corporate to the above point, the design methodology says how to understand the process that provide PLI information to the control plane protocols and use this information efficiently to compute feasible connections. Based on the PLI constraints, it is proposed a centralized PLI based routing algorithm for the selection of OVPN connections.

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“…-Routing-based approach In the routing-based approach (Strand et al 2001), OSPF-TE is extended to convey impairment parameters between nodes in the network. For this purpose, some new top-level type, length and value (TLV) objects are incorporated.…”

Section: Centralised Approachmentioning

confidence: 99%

Signal Processing, Management and Monitoring in Transmission Networks

Vázquez

Montalvo

Ahmed

et al. 2011

Optical Transmission

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1higher, linear and non-linear fibre impairments become prominent factors affecting the signal quality. Thus, new techniques in both physical layer and network layer are necessary for mitigating impairments to accommodate high-speed traffic (Tomkos et al. 2002). On the other hand, the flexibility of modern networks with dynamic and distributed management, where lightpaths can be dynamically and automatically assigned end-to-end, increases the risk of changing path conditions that affect signal quality and consequently quality of service (QoS) over the lifetime of a connection as well as for subsequent connection set-up requests (on-demand routing and wavelength assignment -RWA). For traditional connection provisioning an ideal physical layer, ignoring transmission impairments (Chlamtac et al. 1992) could be assumed because the implicit per hop regeneration (optics-to-electronics-to-optics conversion -O/E/O) compensated signal impairments hop-by-hop in a rather static manner (section commissioning). For end-to-end all-optically switched connections using photonic cross-connect switches (PXC), the conditions change and common practice is not applicable. Anyhow, intelligent connection provisioning is an important traffic engineering problem, and minimising operational cost as well as efficiently utilising network resources is the main driver. In this context, it seems important to have flexible routing protocols that take into consideration the most relevant physical impairments, and are able to exchange messages with their values as part of the route information with others. This condition, if definitely used to calculate routing, will surely assure better success in data delivery over the network (Huang et al. 2005). Irrespective of the control architecture chosen by an operator of an optical network, the included control plane (in charge of setting up and tearing down optical circuits; also known as lightpaths) needs to have a proper set of tools to satisfyingly deal with physical impairments. The most essential tools are: optical signal monitoring, signal processing and impairment compensation techniques (each all-optically and/or electrically). With the help of these tools, it is possible to predict the QoT (quality of transmission) attainable for a lightpath at a given time (i.e. the latest network-wide monitoring instant), and the control plane can route requests across the network

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Issues for routing in the optical layer

Cited by 391 publications

References 2 publications

QoS Aware Optical Virtual Private Network (OVPN)Analytical Control Plane Mechanism

QoS Aware Optical Virtual Private Network (OVPN)Analytical Control Plane Mechanism

Physical Layer Impairments Aware OVPN Connection Selection Mechanisms

Signal Processing, Management and Monitoring in Transmission Networks

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