Impact of Add/Drop Port Utilization Flexibility in DWDM Networks [Invited]

Pedro, João; Pato, Silvia

doi:10.1364/jocn.4.00b142

Cited by 28 publications

(6 citation statements)

References 12 publications

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“…For a total span loss up to 15 dB, the NF is set to 7 dB, for total span loss higher than 25 dB, the NF is set to 5 dB, and linear interpolation is used to estimate the NF for the intermediate span losses. The required OSNR measured in B2B configuration for the three modulation formats under analysis in this work is shown in Table IV. In all networks considered, ROADMs with route&select express (i.e., two WSSs traversed at intermediate nodes) and colorless add/drop (i.e., one WSS traversed at add and drop nodes) are installed at the network nodes [27]. Hence, the number of cascaded WSSs in a routing path with N R ROADM nodes is 2 · N R − 2.…”

Section: A Optical Performance Modelmentioning

confidence: 99%

Designing Transparent Flexible-Grid Optical Networks for Maximum Spectral Efficiency [Invited]

Pedro¹

2017

J. Opt. Commun. Netw.

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Higher-order modulation formats and spectral super-channels are key to maximizing spectral efficiency (SE) in next-generation optical transport networks, thereby postponing/minimizing expensive additional fiber rollouts and reconfigurable optical add/drop multiplexer node upgrades. A flexible dense wavelength division multiplexed (DWDM) grid is key to efficiently accommodating media channels requiring more (or less) than 50 GHz of contiguous spectrum. In particular, routing media channels consisting of multiple adjacent carriers enables packing them closer together and sharing a single pair of guard bands of adaptive width to cope with optical filtering. This effect is maximized by giving preference to deploying media channels with more carriers. However, designing the DWDM network in such a way can translate into resource overprovisioning whenever the traffic requirements between two nodes are below the (large) capacity of the most spectrally efficient media channel format that can be deployed between those nodes. This paper provides insight on how the set of media channels and the network design framework used impact the trade-off between maximizing SE and minimizing resource overprovisioning in transparent flexible-grid optical networks. Furthermore, it discusses enabling strategies to mitigate the risk of resource overprovisioning when maximizing network SE is the key design objective.

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Section: A Optical Performance Modelmentioning

confidence: 99%

Designing Transparent Flexible-Grid Optical Networks for Maximum Spectral Efficiency [Invited]

Pedro¹

2017

J. Opt. Commun. Netw.

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“…1. It consists of a CDC ROADM [4] and a set of n TP i predeployed transponders along with a set of n 3R i predeployed 3R regenerators. Both the transponders and regenerators are equipped with line interfaces tunable across the entire C band.…”

Section: A Network Scenariomentioning

confidence: 99%

“…(8), where hs; d is the hop count of the shortest path between nodes s and d. Network planning assumes distance is the path computation metric. For simplicity, optical performance is modeled by imposing a maximum transmission reach of 2000 km and a 60 km penalty per node traversed [4]. The average service blocking probability is computed from 10 independent simulation runs:…”

Section: A Simulation Setupmentioning

confidence: 99%

“…Particularly, CDC ROADMs, and to a lesser extent noncontentionless architectures, are essential for configuring on demand already deployed transponders and regenerators to support new wavelength services without constraints related to using a specific wavelength channel and input/output direction (degree) of the node, thereby avoiding manual interventions to reconnect these devices to another add/drop port [4]. Moreover, with the prospects of deploying software-defined networking solutions in transport networks, an appropriate tool set for dynamically controlling, managing, and optimizing a multilayer, multidomain, and multivendor network can finally become available [3].…”

Section: Introductionmentioning

confidence: 99%

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Predeployment of Regenerators for Fast Service Provisioning in DWDM Transport Networks [Invited]

Pedro¹

2014

J. Opt. Commun. Netw.

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Dense wavelength division multiplexing (DWDM) transport networks are evolving to support dynamic setup/teardown of wavelength services. This is becoming possible mainly via node architectures with flexible add/drop port utilization, where an already deployed transponder can be tuned to any wavelength and configured to transmit/receive via any output/input direction, and advanced control and management software, which provide the means to remotely reconfigure equipment end to end. In long-haul networks, exploiting these capabilities to quickly set up new services also demands that 3R regenerators (performing reamplification, reshaping, and retiming) have been deployed in advance. This paper proposes a framework that, first, characterizes stochastically the fitness of each network node as a placeholder for predeployed regenerators based on the network and traffic information available and, second, distributes the set of regenerators to match as closely as possible the fitness values. Network simulation on a reference long-haul network under dynamic traffic is used to evaluate the effectiveness of four fitness estimation strategies, each based on a different set of forecasts about the expected network operating conditions. The results highlight that when the main assumptions embedded in these strategies hold during network operation significant benefits can be attained, in terms of lower service blocking probability and/or reduced number of predeployed 3R regenerators, by exploiting additional information when computing the node's fitness values.

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“…The nodes in the metro ring must be able to add/drop the channels to the access system and route them to one of the two directions in the ring, depending on the current wavelength allocation. This is accomplished by using filters based on wavelength selective switches (WSS), which are able to route any channel to a specific output port, as described in [5].…”

Section: High-density Metro-access Aggregationmentioning

confidence: 99%

Capacity prospects of future high density metro-access networks

Pato¹,

Borges²,

Pedro³

2013

2013 15th International Conference on Transparent Optical Networks (ICTON)

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One of the most commonly accepted trends in access networks evolution is merging access and metro aggregation systems, under the premise of enabling the cost-effective support of a larger number of users and/or an extended geographic coverage using a single physical infrastructure. This network architecture extends the reach of the transparent link between the end user and metro networks, providing savings in terms of the aggregation equipment typically deployed between the access and metro aggregation segment. However, bridging access and metro aggregation networks requires a careful dimensioning taking into account both the system limitations and the need to guarantee a low cost per user supported. This paper addresses the capacity boundaries of a metro-access system, formed by multiple tree-based high density access networks interconnected transparently via a high capacity metro ring.

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Impact of Add/Drop Port Utilization Flexibility in DWDM Networks [Invited]

Cited by 28 publications

References 12 publications

Designing Transparent Flexible-Grid Optical Networks for Maximum Spectral Efficiency [Invited]

Designing Transparent Flexible-Grid Optical Networks for Maximum Spectral Efficiency [Invited]

Predeployment of Regenerators for Fast Service Provisioning in DWDM Transport Networks [Invited]

Capacity prospects of future high density metro-access networks

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