Publications (20)4.66 Total impact
-
Article: A novel offline physical layer impairments aware RWA algorithm with dedicated path protection consideration
[show abstract] [hide abstract]
ABSTRACT: Export Date: 10 February 2012, Source: Scopus, Art. No.: 5560683Journal of Lightwave Technology 01/2013; 28(20):3029-3040. · 2.78 Impact Factor -
Article: Lightpath Establishment Assisted by Offline QoT Estimation in Transparent Optical Networks
[show abstract] [hide abstract]
ABSTRACT: We propose lightpath establishment techniques for transparent optical networks, valid for both centralized path computation (i.e., performed by a path computation element-PCE) and distributed path computation (i.e., performed by each ingress node). The proposed techniques rely on correlating the end-to-end quality of transmissions (QoT) (e.g., optical-to-signal-noise ratio-OSNR) of lightpaths already set up to evaluate the QoT of lightpaths to be established. The correlation is leveraged by two end-to-end estimation frameworks called “network kriging” and “norm l<sub>2</sub> minimization.” Each framework is used in turn to estimate end-to-end parameters that describe the QoT for a lightpath to be established, based on measured parameters from other lightpaths that were previously established or probed. Simulations are carried out for both PCE and distributed networking scenarios on a sample optical transparent network. The proposed lightpath establishment techniques reduce the probability that a setup attempt is unsuccessful due to unacceptable QoT and reduce the number of setup attempts to successfully establish lightpaths. Simulation results are also provided to show that our techniques permit a fast convergence of QoT information at PCE or ingress nodes in the context of dynamic networks.Journal of Optical Communications and Networking 12/2010; · 1.87 Impact Factor -
Conference Proceeding: Lightpath establishment in distributed transparent dynamic optical networks using network kriging
[show abstract] [hide abstract]
ABSTRACT: A lightpath provisioning scheme is proposed to guarantee Quality of Transmission (QoT) in transparent optical networks. The scheme novelty consists in utilizing the network kriging framework to estimate lightpath QoT and decrease the number of lightpath establishment attempts before success.Optical Communication, 2009. ECOC '09. 35th European Conference on; 10/2009 -
Conference Proceeding: Issues and challenges in physical-layer aware optically switched network design and operation
[show abstract] [hide abstract]
ABSTRACT: Summary form only given. The evolution of optical networks should aim at improved cost economics, reduced operations efforts, scalability and adaptation to the future services and application requirements. Considering the evolution trend of optical networks, the core networks of the future will have a translucent and eventually transparent optical network structure. The realization of dynamic and fully automated transparent optical core networks is an important task that is required in order to provide cost (CAPEX and OPEX) reduction & performance benefits. This goal has not yet been fully achieved in commercial exploitation due to: a) limited transmission reach and overall performance of transparent optical networks and b) challenges related to the fault localization and isolation in transparent optical networks. These issues have been recognized within the DICONET project. In DICONET framework physical layer impairments and optical performance are monitored and incorporated in impairment aware lightpath routing algorithms. These algorithms will be integrated into a novel dynamic network planning and operation tool that will consider dynamic traffic characteristics, a reconfigurable optical layer, varying physical impairment and component characteristics. The network planning and operation tool along with extended control planes will make possible to realize the vision of optical transparency. In this talk we focus on the impairment aware lightpath establishment problem. Two broad techniques are available to solve this problem: the utilization of a quality of transmission estimator based on real-time monitor measurements and analytical transmission models (called hereafter "Q-Tool"); and through the direct probing of candidate lightpaths. We present recent developments for these two techniques. The first technique, impairment aware routing and wavelength assignment (IA-RWA) using a Q-Tool, has been well investigated especially when lightpaths must be establish- ed under a single constraint (e.g., quality of signal transmission must be high enough, or accumulated noise must be below some threshold). Here, we present a multi-constraint IA-RWA algorithm, called ldquoRahyabrdquo, which uses a single mixed cost metric per link, instead of multiple link costs. The performance of Rahyab algorithm in terms of blocking rate is presented. In the proposed IA-RWA algorithm, the Quality of Transmission (QoT) of a lightpath is calculated using the DICONET Q-Tool. However, this tool, as well as any other QoT estimator, has only a certain degree of accuracy and therefore it introduces errors and inefficiencies in the lightpath selection process. We also show how the Rahyab multi-constraint algorithm can be extended to handle the inaccuracies of the Quality of Transmission (QoT) estimators. In particular, we consider an inaccuracy margin parameter per link that depends on the availability of particular monitors on that link. Inaccuracies may lead to accept lightpaths for which the QoT is actually too low, but estimated as satisfying. We show via simulations that in case of inaccuracies, we successfully block such connection attempts with poor actual QoT but a good estimated (when inaccuracies are not accounted for) QoT. In the second category of lightpath establishment techniques, the quality of transmission is estimated from probing information, rather than analytical models. In particular we leverage an end-to-end estimation framework called "network kriging". The scheme relies on the exploitation of probing data from past lightpath establishments to estimate the Quality of Transmission (QoT) of new lightpaths before they are established. We use network kriging to estimate end-to-end metrics such as Quality of Transmission (QoT) for a lightpath to be established, based on measured data from other, previously established or probed, lightpaths. Network kriging exploits the correlation between QoT metrics of lightpaths that share the samePhotonics in Switching, 2009. PS '09. International Conference on; 10/2009 -
Conference Proceeding: Lightpath establishment in PCE-based dynamic transparent optical networks assisted by end-to-end quality of transmission estimation
[show abstract] [hide abstract]
ABSTRACT: We propose a lightpath establishment technique for transparent optical networks, exploiting the path computation element (PCE) architecture, which leverages an end-to-end estimation framework called network krigingrdquo. The scheme relies on the exploitation of probing data from past lightpath establishments to estimate the Quality of Transmission (QoT) of new lightpaths before they are established. We use network kriging to estimate end-to-end metrics such as Quality of Transmission (QoT) for a lightpath to be established, based on measured data from other, previously established or probed, lightpaths. Network kriging exploits the correlation between QoT metrics of lightpaths that share the same links in order to perform QoT estimation. In our lightpath establishment scheme, several attempts are performed to establish a lightpath. Our technique does not attempt to establish lightpaths with estimated poor QoT. As a consequence, the technique reduces the probability that a lightpath establishment attempt is unsuccessful, and reduces the number of successive attempts to successfully establish lightpaths. Simulation results show on a sample network that, to achieve a given blocking rate, only two establishment attempts are needed if network kriging is used, as opposed to three when it is not.Transparent Optical Networks, 2009. ICTON '09. 11th International Conference on; 08/2009 -
Conference Proceeding: On the Offline Physical Layer Impairment Aware RWA algorithms in transparent optical networks: State-of-the-art and beyond
[show abstract] [hide abstract]
ABSTRACT: In transparent optical networks with no regeneration, the problem of capacity allocation to traffic demands is called ldquorouting and wavelength assignmentrdquo. Much work on this topic recently has focused on the dynamic case, whereby demands arrive and must be served in real-time. In addition, due to lack of regeneration, physical impairments accumulate as light propagates and QoT may become inappropriate (e.g., too high bit error rate). Considering the physical layer impairments in the network planning phase gives rise to a class of RWA algorithms: offline physical layer impairment aware - (PLIA-)RWA. This paper makes a survey of such algorithms, proposes a taxonomy, and a comparison between these algorithms for common metrics. We also propose a novel offline PLIA-RWA algorithm, called POLIO-RWA, and show through simulations that it decreases blocking rate compared with other PLIA-RWA algorithms.Optical Network Design and Modeling, 2009. ONDM 2009. International Conference on; 03/2009 -
Article: A novel impairment aware RWA algorithm with consideration of QoT estimation inaccuracy
[show abstract] [hide abstract]
ABSTRACT: Export Date: 10 February 2012, Source: Scopus, Art. No.: 5739090Journal of Optical Communications and Networking. 3(4):290-299. -
Conference Proceeding: A novel monitor placement algorithm for accurate performance monitoring in optical networks
[show abstract] [hide abstract]
ABSTRACT: Export Date: 10 February 2012, Source: Scopus, Art. No.: 5875146 -
Article: Offline Impairment Aware RWA Algorithms for Cross-Layer Planning of Optical Networks
Lightwave Technology, Journal of. 27(12):1763 -1775. -
Conference Proceeding: A novel monitor placement algorithm for accurate performance monitoring in optical networks
-
Article: Optimized Monitor Placement for Accurate QoT Assessment in Core Optical Networks
Optical Communications and Networking, IEEE/OSA Journal of. PP(99):15-24. -
Conference Proceeding: Lightpath establishment in distributed GMPLS-controlled dynamic transparent optical networks using Quality of Transmission estimation
[show abstract] [hide abstract]
ABSTRACT: Export Date: 10 February 2012, Source: Scopus, Art. No.: 5549326 -
Conference Proceeding: Hardware accelerated impairment aware control plane
[show abstract] [hide abstract]
ABSTRACT: Export Date: 10 February 2012, Source: Scopus, Art. No.: 5465714 -
Conference Proceeding: An offline impairment aware RWA algorithm with dedicated path protection consideration
-
Conference Proceeding: Routing and wavelength assignment for transparent optical networks with QoT estimation inaccuracies
Optical Fiber Communication (OFC), collocated National Fiber Optic Engineers Conference, 2010 Conference on (OFC/NFOEC); -
Article: Offline impairment aware RWA algorithms for cross-layer planning of optical networks
[show abstract] [hide abstract]
ABSTRACT: Export Date: 10 February 2012, Source: ScopusJournal of Lightwave Technology. 27(12):1763-1775. -
Article: Offline Impairment Aware RWA Algorithms for Cross-Layer Planning of Optical Networks
Lightwave Technology, Journal of. 27(12):1763-1775. -
Conference Proceeding: Experimental demonstration of centralized and distributed impairment-aware control plane schemes for dynamic transparent optical networks
Optical Fiber Communication (OFC), collocated National Fiber Optic Engineers Conference, 2010 Conference on (OFC/NFOEC); -
Article: Experimental demonstration of an impairment aware network planning and operation tool for transparent/translucent optical networks
[show abstract] [hide abstract]
ABSTRACT: Cited By (since 1996): 4, Export Date: 10 February 2012, Source: Scopus, Art. No.: 5629342Journal of Lightwave Technology. 29(4):439-448. -
Article: Experimental Demonstration of an Impairment Aware Network Planning and Operation Tool for Transparent/Translucent Optical Networks
Lightwave Technology, Journal of. 29(4):439-448.
Top co-authors
Top Journals
Institutions
-
2009–2010
-
Scuola Superiore Sant'Anna
Pisa, Tuscany, Italy -
Polytechnic University of Catalonia
Barcelona, Catalonia, Spain
-
