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Optical Transport Network

About: Optical Transport Network is a research topic. Over the lifetime, 6055 publications have been published within this topic receiving 85783 citations.


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Journal ArticleDOI
TL;DR: In this paper, the authors identify a realistic expectation of modulation formats for the next 10 years and quantifies the possible capacity gains, and study when the capacity will be exhausted using current fixed-grid optical channel assignment, and compare this with a pack of novel evolution strategies toward flexi-grid.
Abstract: It is widely acknowledged by operators and market analysts from all parts of the telecommunications industry that bandwidth demand is increasing dramatically, year by year. This traffic growth highly impacts on all network segments and pushes network operators to consider new networking solutions. Flexi-grid technologies enable more flexible use of the spectral resources, increasing the overall network spectral efficiency. However, the currently deployed fixed-grid dense wavelength division multiplexing (DWDM) optical infrastructure might be replaced with new components to enable this technology. This paper first identifies a realistic expectation of modulation formats for the next 10 years and quantifies the possible capacity gains. Second, we study when the capacity will be exhausted using current fixed-grid optical channel assignment, and compare this with a pack of novel evolution strategies toward flexi-grid. Results show that the capacity will be exhausted by 2019 in the Spanish core network, and that by applying the flexi-grid evolutionary model, the network life can be extended up to five years. A shorter-term rationale to migrate to flexi-grid is the availability of cost-effective 400 Gbps and 1 Tbps transmission.

19 citations

Patent
07 Jan 2005
TL;DR: In this paper, the authors proposed a novel network architecture for evolving traditional service provider networks, which consists of a transport layer including an optical network, which aggregates a plurality of services from the access layer.
Abstract: The present invention discloses novel network architectures for evolving traditional service provider networks. The network architecture of the invention has a transport layer including an optical network. At least one node of the network architecture includes a large packet switch that is coupled to the transport layer and to an access layer. The large packet switch aggregates a plurality of services from the access layer. The large packet switch also performs packet level grooming of the information from the services prior to transport of the information via the transport layer. The optical network performs restoration for the network architecture. In one embodiment, the optical network is an optical ring network including at least one optical switch and restoration is performed at the layer-0 (optical layer). In another embodiment, the optical network is a bi-directional line-switched ring (BLSR) utilizing a Synchronous Optical Network (SONET) standard and restoration is performed by the layer-1 (SONET layer). The network architectures of the invention by utilizing a large packet switch to perform service aggregation and packet level grooming, and by performing restoration either at the layer-0 (optical layer) or layer-1 (SONET layer), creates a single converged network that achieves the superior restoration performance needed for carrier grade availability but at much lower costs than traditional service providers which operate multiple overlay networks. Also disclosed are methods to optimize traditional service provider networks and the disclosed novel architectures of the invention.

19 citations

Patent
18 Sep 2006
TL;DR: In this article, a transponder unit which relays signals between a plurality of channels of an optical transport network is reconfigurable for selective connections, such that the second client is connected to the first network channel and the first client is connecting to the second network channel.
Abstract: A transponder unit which relays signals between a plurality of channels of an optical transport network and a plurality of clients. The interconnections within the transponder unit are reconfigurable for selective connections. A connection between a first client and a first network channel and a connection between a second client and a second network channel is independent of each other and may be selected so that the second client is connected to the first network channel and the first client is connected to the second network channel. Other selected connections are also possible.

19 citations

Journal ArticleDOI
TL;DR: A novel online routing, spectrum, and modulation assignment (RSMA) algorithm is conceived, which adopts both models to compute paths by trying to optimize the spectral link and MF-OTP resources when dynamically serving flexgrid connections.
Abstract: Elastic optical networks aim at considerably improving network spectrum efficiency by using a flexible grid, while traditional optical transport networks operate with fixed frequency spacing. In such flexible networks, connections are accommodated into so-called “frequency slots,” which are dynamically established depending on client data rates and selected signal modulation formats. Key enablers to develop such a network infrastructure are bandwidth variable optical cross-connects (BV-OXCs) and BV transponders. For the latter, a multi-flow optical transponder (MF-OTP) is being considered as an appealing solution because of its support of high-rate super-channels as well as its elasticity, where optical connections can be reconfigured flexibly according to the required traffic requests. The dynamic selection (path computation) and automatic network configuration of both optical spectrum and MF-OTP resources are handled by a control plane entity. Herein, a distributed Generalized Multi-Protocol Label Switching (GMPLS) control plane combined with an active Path Computation Element (PCE) are adopted for the dynamic instantiation of flexgrid optical connections. To fully control the MF-OTP’s attributes and capabilities, specific extensions are required for both GMPLS routing and signaling.We propose and experimentally validate such extensions by considering two information models: partial and full. The difference between the models lies in information related to optical spectrum status (carried by the full model) on the MF-OTP interfaces attached to the BV-OXCs. Furthermore, a novel online routing, spectrum, and modulation assignment (RSMA) algorithm is conceived. The RSMA adopts both models to compute paths by trying to optimize the spectral link and MF-OTP resources when dynamically serving flexgrid connections. The experimental evaluation compares the models' attained RSMA performance with respect to the blocking probability as well as the setup and path computation delays.

19 citations

Patent
24 Apr 2001
TL;DR: In this article, the authors proposed a bidirectional wavelength division multiplexed optical communication network with a protection switching capability within a bi-directional optical waveguide, which includes the capacity to generate X+Y protect optical channels which respectively propagate in the first and second directions.
Abstract: The present invention provides a bidirectional wavelength division multiplexed optical communication network having a protection switching capability within a bidirectional optical waveguide. A bidirectional optical waveguide having plural optical nodes carries counterpropagating wavelength division multiplexed optical communication signals: M optical channels in a first direction and N optical channels in a second direction. The network includes the capacity to generate X+Y protect optical channels which respectively propagate in the first and second directions. Upon detecting loss of an optical signal means are provided for switching the affected M work optical channels to the Y protect optical channels and the affected N work channels to the X protect channels. In this manner, protection switching may be accomplished in a bidirectional optical network on a single bidirectional optical waveguide.

19 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202313
202237
202132
202060
201998
201884