G. Junyent - Academia.edu (original) (raw)
Papers by G. Junyent
Journal of Optical Communications and Networking, 2013
ABSTRACT National IP/multiprotocol label switching (MPLS) networks have been designed using a mul... more ABSTRACT National IP/multiprotocol label switching (MPLS) networks have been designed using a multilayer approach to take advantage of the optical layer's longer reach. In that approach, the IP/MPLS layer performs routing and flow aggregation, whereas the optical layer, based on wavelength division multiplexing technology, transports those aggregated flows into optical connections. However, the flexgrid technology, featuring a finer granularity, also allows the performance of grooming at the optical layer, and hence, the aggregation level of the incoming flows can be reduced. Taking advantage of that fact, in this paper we propose a new network architecture consisting of a number of IP/MPLS areas performing routing and aggregating flows to the desired level and a flexgrid-based core network connecting the areas among them. A two-step procedure to design the whole network is presented where locations are first partitioned into a set of areas, and then each area network and the flexgrid core is designed separately. Mixed-integer linear programming models are developed for the resulting optimization problems. Solving these models, however, becomes impractical for real-sized scenarios so evolutionary heuristics based on the biased random-key genetic algorithm framework are also proposed. Extending the core toward the edges results in significant savings in both the core and IP/MPLS networks.
2013 15th International Conference on Transparent Optical Networks (ICTON), 2013
ABSTRACT Digitally processed modulations formats such as Nyquist-WDM are investigated for impleme... more ABSTRACT Digitally processed modulations formats such as Nyquist-WDM are investigated for implementation of future flexible optical networks, by using integrated photonic devices and moderate speed optoelectronics. We compare with other modulation formats as OFDM regarding complexity and adaptability to transceiver limitations.
CLEO:2011 - Laser Applications to Photonic Applications, 2011
Page 1. Characterization of Fast and Power Efficient Optical OFDM Transmission System Based on Ha... more Page 1. Characterization of Fast and Power Efficient Optical OFDM Transmission System Based on Hartley Transform Michela Svaluto Moreolo*, Josep Maria Fabrega, Gabriel Junyent Centre Tecnològic de Telecomunicacions de Catalunya (CTTC), Av. ...
Proceedings of MELECON '94. Mediterranean Electrotechnical Conference
ABSTRACT
2014 16th International Conference on Transparent Optical Networks (ICTON), 2014
Optical Switching and Networking, 2014
IEEE Photonics Technology Letters, 2013
IEEE Photonics Technology Letters, 1995
IEEE Communications Magazine, 2006
IEEE Communications Magazine, 2008
During the last few years there has been a trend for organizations such as universities, hospital... more During the last few years there has been a trend for organizations such as universities, hospitals, schools, and big corporations to buy their own fiber and point-to-point links from different sup-pliers [1, 2]. These organizations would like to manage these resources as part of ...
OFC/IOOC . Technical Digest. Optical Fiber Communication Conference, 1999, and the International Conference on Integrated Optics and Optical Fiber Communication
Conference Proceedings. LEOS '97. 10th Annual Meeting IEEE Lasers and Electro-Optics Society 1997 Annual Meeting, 1996
LEOS 2000. 2000 IEEE Annual Meeting Conference Proceedings. 13th Annual Meeting. IEEE Lasers and Electro-Optics Society 2000 Annual Meeting (Cat. No.00CH37080), 2000
2nd International Conference on Testbeds and Research Infrastructures for the Development of Networks and Communities, 2006. TRIDENTCOM 2006., 2006
2012 17th European Conference on Networks and Optical Communications, 2012
ABSTRACT In this paper, we propose low complexity bit rate variable transponders for adaptive DC ... more ABSTRACT In this paper, we propose low complexity bit rate variable transponders for adaptive DC biased Optical OFDM systems. The transponders are based on an alternative transform, the fast Hartley transform (FHT), and use adaptively modulated O-OFDM (AMO-OFDM) to introduce flexibility to optical networks. Additionally, low complexity selective mapping (LC-SLM) technique is included in the bit rate variable transponders to mitigate the effects of the peak-to-average power ratio (PAPR) and reduce the clipping noise, enabling the use of low bias values.
2012 17th European Conference on Networks and Optical Communications, 2012
ABSTRACT A characterization of a phase modulated coherent optical OFDM system based on Hartley tr... more ABSTRACT A characterization of a phase modulated coherent optical OFDM system based on Hartley transform is performed. The use of phase modulation minimizes OFDM amplitude fluctuations, resulting in reduced peak-to-average power ratio. Also, it is based on Hartley transform for simplifying the signal processing. In this paper, theoretical models are developed for describing the behavior of the system when it is limited by the receiver sensitivity and when optical amplification noise is dominating. For both cases, the resulting models are validated by means of extensive simulations.
Lecture Notes in Computer Science, 2007
Journal of Optical Communications and Networking, 2013
ABSTRACT National IP/multiprotocol label switching (MPLS) networks have been designed using a mul... more ABSTRACT National IP/multiprotocol label switching (MPLS) networks have been designed using a multilayer approach to take advantage of the optical layer's longer reach. In that approach, the IP/MPLS layer performs routing and flow aggregation, whereas the optical layer, based on wavelength division multiplexing technology, transports those aggregated flows into optical connections. However, the flexgrid technology, featuring a finer granularity, also allows the performance of grooming at the optical layer, and hence, the aggregation level of the incoming flows can be reduced. Taking advantage of that fact, in this paper we propose a new network architecture consisting of a number of IP/MPLS areas performing routing and aggregating flows to the desired level and a flexgrid-based core network connecting the areas among them. A two-step procedure to design the whole network is presented where locations are first partitioned into a set of areas, and then each area network and the flexgrid core is designed separately. Mixed-integer linear programming models are developed for the resulting optimization problems. Solving these models, however, becomes impractical for real-sized scenarios so evolutionary heuristics based on the biased random-key genetic algorithm framework are also proposed. Extending the core toward the edges results in significant savings in both the core and IP/MPLS networks.
2013 15th International Conference on Transparent Optical Networks (ICTON), 2013
ABSTRACT Digitally processed modulations formats such as Nyquist-WDM are investigated for impleme... more ABSTRACT Digitally processed modulations formats such as Nyquist-WDM are investigated for implementation of future flexible optical networks, by using integrated photonic devices and moderate speed optoelectronics. We compare with other modulation formats as OFDM regarding complexity and adaptability to transceiver limitations.
CLEO:2011 - Laser Applications to Photonic Applications, 2011
Page 1. Characterization of Fast and Power Efficient Optical OFDM Transmission System Based on Ha... more Page 1. Characterization of Fast and Power Efficient Optical OFDM Transmission System Based on Hartley Transform Michela Svaluto Moreolo*, Josep Maria Fabrega, Gabriel Junyent Centre Tecnològic de Telecomunicacions de Catalunya (CTTC), Av. ...
Proceedings of MELECON '94. Mediterranean Electrotechnical Conference
ABSTRACT
2014 16th International Conference on Transparent Optical Networks (ICTON), 2014
Optical Switching and Networking, 2014
IEEE Photonics Technology Letters, 2013
IEEE Photonics Technology Letters, 1995
IEEE Communications Magazine, 2006
IEEE Communications Magazine, 2008
During the last few years there has been a trend for organizations such as universities, hospital... more During the last few years there has been a trend for organizations such as universities, hospitals, schools, and big corporations to buy their own fiber and point-to-point links from different sup-pliers [1, 2]. These organizations would like to manage these resources as part of ...
OFC/IOOC . Technical Digest. Optical Fiber Communication Conference, 1999, and the International Conference on Integrated Optics and Optical Fiber Communication
Conference Proceedings. LEOS '97. 10th Annual Meeting IEEE Lasers and Electro-Optics Society 1997 Annual Meeting, 1996
LEOS 2000. 2000 IEEE Annual Meeting Conference Proceedings. 13th Annual Meeting. IEEE Lasers and Electro-Optics Society 2000 Annual Meeting (Cat. No.00CH37080), 2000
2nd International Conference on Testbeds and Research Infrastructures for the Development of Networks and Communities, 2006. TRIDENTCOM 2006., 2006
2012 17th European Conference on Networks and Optical Communications, 2012
ABSTRACT In this paper, we propose low complexity bit rate variable transponders for adaptive DC ... more ABSTRACT In this paper, we propose low complexity bit rate variable transponders for adaptive DC biased Optical OFDM systems. The transponders are based on an alternative transform, the fast Hartley transform (FHT), and use adaptively modulated O-OFDM (AMO-OFDM) to introduce flexibility to optical networks. Additionally, low complexity selective mapping (LC-SLM) technique is included in the bit rate variable transponders to mitigate the effects of the peak-to-average power ratio (PAPR) and reduce the clipping noise, enabling the use of low bias values.
2012 17th European Conference on Networks and Optical Communications, 2012
ABSTRACT A characterization of a phase modulated coherent optical OFDM system based on Hartley tr... more ABSTRACT A characterization of a phase modulated coherent optical OFDM system based on Hartley transform is performed. The use of phase modulation minimizes OFDM amplitude fluctuations, resulting in reduced peak-to-average power ratio. Also, it is based on Hartley transform for simplifying the signal processing. In this paper, theoretical models are developed for describing the behavior of the system when it is limited by the receiver sensitivity and when optical amplification noise is dominating. For both cases, the resulting models are validated by means of extensive simulations.
Lecture Notes in Computer Science, 2007