Josep Fábrega

Dr. Josep Fábrega

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Academic Career Length

21Years (2006-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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19 February 2015 in IEEE Communications Magazine
Verified
Journal Article
Open access
NSNicola Sambo
Nicola Sambo
Piero CastoldiPiero Castoldi
Piero Castoldi
ADAntonio D'ERrico
Antonio D'ERrico
EREmilio Riccardi
Emilio Riccardi
APAnnachiara Pagano
Annachiara Pagano
JGJuan P. F.-P Gimenez
Juan P. F.-P Gimenez
This article reports the work on next generation transponders for optical networks carried out within the last few years. A general architecture supporting super-channels (i.e., optical connections composed of several adjacent subcarriers) and sliceability (i.e., subcarriers grouped in a number of independent super-channels with different destinations) is presented. Several transponder implementations supporting different transmission techniques are considered, highlighting advantages, economics, and complexity. Discussions include electronics, optical components, integration, and programmability. Application use cases are reported.
19 February 2015 in IEEE Communications Magazine
Verified
Journal Article
Closed access
ANAntonio Napoli
Antonio Napoli
MBMarc Bohn
Marc Bohn
DRDanish Rafique
Danish Rafique
ASAlexandros Stavdas
Alexandros Stavdas
NSNicola Sambo
Nicola Sambo
JGJuan Pedro Fernandez-Palacios Gimenez
Juan Pedro Fernandez-Palacios Gimenez
In this work we detail the strategies adopted in the European research project IDEALIST to overcome the predicted data plane capacity crunch in optical networks. In order for core and metropolitan telecommunication systems to be able to catch up with Internet traffic, which keeps growing exponentially, we exploit the elastic optical networks paradigm for its astounding characteristics: flexible bandwidth allocation and reach tailoring through adaptive line rate, modulation formats, and spectral efficiency. We emphasize the novelties stemming from the flex-grid concept and report on the corresponding proposed target network scenarios. Fundamental building blocks, like the bandwidth-variable transponder and complementary node architectures ushering those systems, are detailed focusing on physical layer, monitoring aspects, and node architecture design.
24 May 2016 in Journal of Optical Communications and Networking
Verified
Journal Article
Open access
PDF file
JFJosep Fábrega
Josep Fábrega
MMM. Svaluto Moreolo
M. Svaluto Moreolo
LML. Martín
L. Martín
APA. Chiadò Piat
A. Chiadò Piat
ERE. Riccardi
E. Riccardi
ANA. Napoli
A. Napoli
This paper describes the problematic filter narrowing effect in the context of next-generation elastic optical networks. First, three possible scenarios are introduced: the transition from an actual fixed-grid to a flexi-grid network, the generic full flexi-grid network, and a proposal for a filterless optical network. Next, we investigate different transmission techniques and evaluate the penalty introduced by the filtering effect when considering Nyquist wavelength division multiplexing, single side-band direct-detection orthogonal frequency division multiplexing, and symbol-rate variable dual polarization quadrature amplitude modulation. Also, different approaches to compensate for the filter narrowing effect are discussed. Results show that the specific needs per each scenario can be fulfilled by the aforementioned technologies and techniques or a combination of them, when balancing performance, network reach, and cost.
14 March 2019 in IEEE Transactions on Broadcasting
Verified
Journal Article
Open access
Simon RommelSimon Rommel
Simon Rommel
DPDiego Perez-Galacho
Diego Perez-Galacho
JFJosep Fábrega
Josep Fábrega
RMRaul Munoz
Raul Munoz
Salvador SalesSalvador Sales
Salvador Sales
Idelfonso Tafur MonroyIdelfonso Tafur Monroy
Idelfonso Tafur Monroy
17 December 2015 in Journal of Lightwave Technology
Verified
Journal Article
Open access
MMMichela Svaluto Moreolo
Michela Svaluto Moreolo
JFJosep Fábrega
Josep Fábrega
LNLaia Nadal
Laia Nadal
FVFrancisco Javier Vilchez
Francisco Javier Vilchez
AMArturo Mayoral
Arturo Mayoral
KKKen-Ichi Kitayama
Ken-Ichi Kitayama
We propose a sliceable bandwidth variable transceiver (S-BVT) architecture suitable for metro/regional elastic networks and highly scalable data center applications. It adopts multicarrier modulation, either OFDM or DMT, and a cost-effective optoelectronic front-end. The high-capacity S-BVT is programmable, adaptive, and reconfigurable by an SDN controller for efficient resource usage, enabling unique granularity, flexibility, and grid adaptation, even in the conventional fixed-grid networks. We experimentally demonstrate its multiple advanced functionalities in a four-node photonic mesh network. This includes SDN-enabled rate/distance adaptive multiflow generation and routing/switching, slice-ability, flexibility, and adaptability for the mitigation of spectrum fragmentation, as well as for a soft migration toward the flexi-grid paradigm.
13 August 2014 in Journal of Lightwave Technology
Verified
Journal Article
Open access
LNLaia Nadal
Laia Nadal
MMMichela Svaluto Moreolo
Michela Svaluto Moreolo
JFJosep Fábrega
Josep Fábrega
ADAnnika Dochhan
Annika Dochhan
HGHelmut Griesser
Helmut Griesser
JEJorg-Peter Elbers
Jorg-Peter Elbers
In this paper, we present the design and analysis of an adaptive cost-effective discrete multitone transponder (DMT) using direct detection (DD) suitable for data center interconnections. Levin Campello margin adaptive (LC-MA) algorithm is applied to the transponder digital signal processing modules to enhance fiber chromatic dispersion (CD) resilience, while achieving high-data rate transmission. The bit error rate (BER) performance and the rate/distance adaptive capabilities of the proposed transponder have been numerically analyzed and compared to bandwidth variable uniform loading, taking into account the transmission impairments at the varying of the fiber length. Specifically, the performance of the designed transponder has been assessed from 20 to 112 Gb/s, extending the achievable reach at 50 Gb/s beyond 80 km of standard single mode fiber (SSMF). The numerical simulations have been compared with experimental results, evidencing good agreement in presence of transmission impairments.