Kostas Christodoulopoulos – Assistant Professor Department of Informatics and Telecommunications National and Kapodistrian University of Athens,   Panepistimioupoli , Ilisia, 157 84, Greece Room: B19 Mail: kchristodou at di dot uoa dot gr Tel: +30 210 727 5313

Full list of publications

Journal papers

  [J1]      K Kontodimas, K Christodoulopoulos, E Varvarigos, "A Lean and Fast Optical Datacenter Internal Network Fabric with Partial Configurability", Optical Switching and Networking, 2025

  [J2]      P. Soumplis, K. Christodoulopoulos, P. Kokkinos, A. Napoli, M. Hosseini, K. Yiannopoulos, E. Varvarigos, "Enabling extended access aggregation with light-trees and point-to-multipoint coherent transceivers", Journal of Optical Communications and Networking 17 (4), 249-261, 2025.

  [J3]      K. Christodoulopoulos, S. Bidkar, W. Lautenschlaeger, T. Pfeiffer, R. Bonk, “Deterministic passive optical networking”, IEEE/OSA Journal of Optical Communications and Networking, vol 16, is 2, 2024.

  [J4]      F. Locatelli, K. Christodoulopoulos, C. Delezoide, J. M. Fàbrega , M. Svaluto Moreolo, L. Nadal, A. Mahajan, S. Spadaro, “Feedback-Based Channel Frequency Optimization in Superchannels”,   IEEE/OSA Journal of Lightwave Technology, vol 42, is 13, 2024.

  [J5]      T. Pfeiffer, P. Dom, S. Bidkar, F. Fredricx , K. Christodoulopoulos, R. Bonk, " PON going beyond FTTH ", IEEE/OSA Journal of Optical Communications and Networking, 2022. Invited

  [J6]      W. Lautenschlaeger , F. Frick, K. Christodoulopoulos, T. Henke, " A Scalable Factory Backbone for Multiple Independent Time-Sensitive Networks ", Elsevier Journal of Systems Architecture, 2021.

  [J7]      A. Mahajan, K. Christodoulopoulos, R. Martínez, R. Muñoz, S. Spadaro, " Impact of Multi-Vendor Transponders Performance on Design Margin in Optical Networks ", IEEE Access 9, 2021.

  [J8]      F. Locatelli, K. Christodoulopoulos, M.S. Moreolo, J.M. Fabrega, L. Nadal, S. Spadaro, " Spectral processing techniques for efficient monitoring in optical networks ”, IEEE/OSA Journal of Optical Communications and Networking 13 (7), 2021.

  [J9]      S. Bigo , N. Benzaoui, K. Christodoulopoulos, R. Miller, W. Lautenschlaeger , F. Frick, " Dynamic deterministic digital infrastructure for time-sensitive applications in factory floors ", IEEE Journal of Selected Topics in Quantum Electronics, 2021. Invited

[J10]      A. Mahajan, K. Christodoulopoulos, R. Martínez, R. Muñoz, S. Spadaro, " Quality of transmission estimator retraining for dynamic optimization in optical networks ", IEEE/OSA Journal of Optical Communications and Networking 13 (4), 2021.

[J11]      K. Tokas , G. Patronas, C. Spatharakis , P. Bakopoulos , A. Kyriakos, G Landi, E. Zahavi, K. Christodoulopoulos, M. Aziz, R. Pitwon , D. Gallico, D. Reisis, E. Varvarigos, H. Avramopoulos " End-to-End Real-Time Demonstration of the Slotted, SDN-Controlled NEPHELE Optical Datacenter Network ", Photonics 7 (2), 2020.

[J12]      A. Mahajan, K. Christodoulopoulos, R. Martínez, S. Spadaro, R. Muñoz, " Modeling EDFA gain ripple and filter penalties with machine learning for accurate QOT estimation ", IEEE/OSA Journal of Lightwave Technology, 38 (9), 2616-2629, 2020.

[J13]      F. Locatelli, K. Christodoulopoulos, M. Svaluto Morelo, J. M. Fabrega, S. Spadaro, “ Machine Learning-Based in-band OSNR Estimation from Optical Spectra “, IEEE Photonic Technology Letters (PTL), 2019.

[J14]      K. Christodoulopoulos, C. Delezoide, N. Sambo, A. Kretsis, I. Sartzetakis, A. Sgambelluri, N. Argyris, G. Kanakis, P. Giardina, G. Bernini, D. Roccato , A. Percelsi , R. Morro, H. Avramopoulos, P. Castoldi, P. Layec , S. Bigo , “ Toward efficient, reliable, and autonomous optical networks: the ORCHESTRA solution ”, IEEE/OSA Journal of Optical Communications and Networking 2019. Invited

[J15]      N. Sambo, K. Christodoulopoulos, N. Argyris, P. Giardina, C. Delezoide, D. Roccato , A. Percelsi , R. Morro, A. Sgambelluri, A. Kretsis, G. Kanakis, G. Bernini, E. Varvarigos, P. Castoldi, “ Field Trial: Demonstrating Automatic Reconfiguration of Optical Networks based on Finite State Machine ”, IEEE/OSA, Journal of Lightwave Technology, 2019. Invited

[J16]      C. Delezoide, K. Christodoulopoulos, A. Kretsis, N. Argyris, G. Kanakis, A. Sgambelluri, N. Sambo, P. Giardina, G. Bernini, D. Roccato , A. Percelsi , R. Morro, H. Avramopoulos, E Varvarigos, P. Castoldi, P. Layec , S. Bigo , “ Marginless Operation of Optical Networks ”, IEEE/OSA, Journal of Lightwave Technology, 2019. Invited

[J17]      I. Sartzetakis, K. Christodoulopoulos, E. Varvarigos, “ Accurate quality of transmission estimation with machine learning ”, IEEE/OSA, Journal of Optical Communications and Networking, 2019.

[J18]      N. Sambo, K. Christodoulopoulos, N. Argyris, P. Giardina, C. Delezoide, A. Sgambelluri, A. Kretsis, G. Kanakis, F. Fresi , G. Bernini, H. Avramopoulos, E. Varvarigos, P. Castoldi, “ Experimental Demonstration of a Fully Disaggregated and Automated White Box Comprised of Different Types of Transponders and Monitors ”, IEEE/OSA Journal of Lightwave Technology, 2019.

[J19]      A. Siokis , K. Christodoulopoulos, E. Varvarigos, " Layout model for optical interconnects based on λ-routing grids and topology embeddings ", IEEE/OSA, Journal of Optical Communications and Networking, 2018.

[J20]      I. Sartzetakis, N. Sambo, K. Christodoulopoulos, P. Castoldi, E. Varvarigos, " Exploiting spectrum sharing for soft failure recovery ", IEEE/OSA, Journal of Optical Communications and Networking, 2018.

[J21]      G. Landi, M. Capitani, A. Kretsis, K. Kontodimas, P. Kokkinos, D. Gallico, M. Biancani , K. Christodoulopoulos, E. Varvarigos, " Inter-domain optimization and orchestration for optical datacenter networks ", IEEE/OSA, Journal of Optical Communications and Networking, 2018.

[J22]      I. Gravalos, P. Makris, K. Christodoulopoulos, E. Varvarigos, " Efficient Network Planning for Internet of Things with QoS Constraints ", IEEE Journal of Internet of Things, 5 (5), 2018.

[J23]      P. Bakopoulos , K. Christodoulopoulos, G. Landi, M. Aziz, E. Zahavi, D. Gallico, R. Pitwon , K. Tokas , I. Patronas, M. Capitani, C. Spatharakis , K. Yiannopoulos, K. Wang, K. Kontodimas, I. Lazarou, P. Wieder, D. Reisis, E. Varvarigos, M. Biancani , H. Avramopoulos, " NEPHELE: An End-to-End Scalable and Dynamically Reconfigurable Optical Architecture for Application-Aware SDN Cloud Data Centers ", IEEE Communications Magazine, 2018.

[J24]      P. Papanikolaou, K. Christodoulopoulos, E. Varvarigos, " Optimization Techniques for Incremental Planning of Multilayer Elastic Optical Networks ", IEEE/OSA Journal of Optical Communications and Networking, 2018.

[J25]      I. Sartzetakis, K. Christodoulopoulos, E. Varvarigos, " Cross-Layer Adaptive Elastic Optical Networks ", IEEE/OSA Journal of Optical Communications and Networking (JOCN), 2018. Invited

[J26]      P. Soumplis, K. Christodoulopoulos, M. Quagliotti , A. Pagano, E. Varvarigos, " Multi-Period Planning With Actual Physical and Traffic Conditions ", IEEE/OSA Journal of Optical Communications and Networking (JOCN), 2018. Invited

[J27]      K. Christodoulopoulos, K. Kontodimas, A. Siokis , K. Yiannopoulos, E. Varvarigos, " Efficient bandwidth allocation in the NEPHELE optical/electrical datacenter interconnect ", IEEE/OSA Journal of Optical Communications and Networking (JOCN), 2017.

[J28]      P. Soumplis, K. Christodoulopoulos, M. Quagliotti , A. Pagano, E. Varvarigos, " Network Planning with Actual Margins ", IEEE/OSA Journal of Lightwave Technology (JLT), 2017.

[J29]      A. Siokis , K. Christodoulopoulos, N. Pleros , E. Varvarigos, " Electro-optic switches based on space switching of multiplexed WDM signals: Blocking vs non-blocking design trade-offs ", Elsevier Optical Switching and Networking 25, pp. 40-56, 2017.

[J30]      P. Maniotis , N. Terzenidis , A. Siokis , K. Christodoulopoulos, E. Varvarigos, M. Immonen, H. J. Yan, L. X. Zhu, K. Hasharoni , R. Pitwon , K. Wang, N. Pleros , " Application-oriented On-board Optical Technologies for HPCs ", IEEE/OSA Journal of Lightwave Technology (JLT), 2017.

[J31]      P. Papanikolaou, K. Christodoulopoulos, E. Varvarigos, " Joint multi-layer survivability techniques for IP-over-elastic-optical-networks ", IEEE/OSA Journal of Optical Communications and Networking (JOCN), 9 (1), 2017.

[J32]      A. Siokis , K. Christodoulopoulos, E. Varvarigos, “ Multipoint Architectures for On-Board Optical Interconnects ”, IEEE/OSA Journal of Optical Communications and Networking (JOCN), Vol. 8 is. 11, 2016.

[J33]      I. Sartzetakis, K. Christodoulopoulos, C. Tsekrekos, D. Syvridis , E. Varvarigos, “ Quality of transmission estimation in WDM and elastic optical networks accounting for space–spectrum dependencies ”, IEEE/OSA Journal of Optical Communications and Networking (JOCN), Vol. 8, is. 9, 2016

[J34]      M.S. Moreolo, J.M. Fabrega, L. Martin, K. Christodoulopoulos, E. Varvarigos, J. P. F. Palacios, “ Flexgrid Technologies Enabling BRAS Centralization in MANs ”, IEEE/OSA Journal of Optical Communications and Networking (JOCN), Vol. 8, is. 7, 2016

[J35]      V. Gkamas , K. Christodoulopoulos, E. Varvarigos, "Energy-minimized design of IP over flexible optical networks" , Wiley International Journal of Communication Systems, 2015.

[J36]      V. Gkamas , K. Christodoulopoulos, E. Varvarigos, "A joint multi-layer planning algorithm for IP over flexible optical networks" , IEEE/OSA Journal of Lightwave Technology (JLT), Vol. 33, Is. 14, 2015.

[J37]      K. Christodoulopoulos, C. Papageorgiou, E. Varvarigos, "Minimizing Expected Transmissions Multicast in Wireless Multihop Networks" , Springer International Journal of Wireless Information Networks: Vol. 22, Is. 3, pp. 205-219, 2015.

[J38]      P. Papanikolaou, P. Soumplis, K. Manousakis, G. Papadimitriou, G. Ellinas, K. Christodoulopoulos, E. Varvarigos, "Minimizing Energy and Cost in fixed-grid and flex-grid networks" , IEEE/OSA Journal of Optical Communications and Networking (JOCN), Vol. 7, Is. 4, 2015.

[J39]      K. Christodoulopoulos, D. Lugones, K. Katrinis , M. Rufinni , D. O'Mahony, "Performance Evaluation of a Hybrid Optical/Electrical Interconnect" , IEEE/OSA Journal of Optical Communications and Networking (JOCN), Vol. 7, Is. 3, 2015.

[J40]      P. Soumplis, K. Christodoulopoulos, E. Varvarigos, "Dynamic Connection Establishment and Network Re-optimization in Flexible Optical Networks" , Invited, Springer Photonic Network Communications (PNC), 2015.

[J41]      A. Kretsis, P. Kokkinos, K. Christodoulopoulos, T. Varvarigou , E. Varvarigos, "Mantis: Cloud-based optical network planning and operation tool" , Elsevier Compute Networks, Vol. 77, pp. 153-168, 2015.

[J42]      E. Varvarigos, K. Christodoulopoulos, "Algorithmic Aspects in Planning Fixed and Flexible Optical Networks With Emphasis on Linear Optimization and Heuristic Techniques" , Invited, IEEE/OSA Journal Lightwave Technology (JLT), Vol 32, Is. 4, pp. 681-693, 2014.

[J43]      A Kretsis, K Christodoulopoulos, P Kokkinos, E Varvarigos, "Planning and operating flexible optical networks: Algorithmic issues and tools" , IEEE Communications Magazine, Vol. 52, Is. 1, pp. 61-69, 2014.

[J44]      K. Christodoulopoulos, P. Soumplis, E. Varvarigos, "Planning flexible optical networks under physical layer constraints" , IEEE/OSA Journal of Optical Communications and Networking, (JOCN), Vol. 5, Is. 11, pp. 1296-1312, 2013.

[J45]      K. Christodoulopoulos, K. Katrinis , M. Ruffini, D. O' Mahony, "Tailoring the Network to the Problem: Topology Configuration in Hybrid EPS/OCS Interconnects" , Willey Interscience Concurrency and Computation: Practice and Experience, Vol. 25, Is. 17, pp. 2412-2432, 2013.

[J46]      K. Christodoulopoulos, I. Tomkos, E. Varvarigos, "Time-Varying Spectrum Allocation Policies in Flexible Optical Networks" , IEEE Journal on Selected Areas in Communication (JSAC), Vol 31, Is. 1, pp. 13-25, 2013.

[J47]      E. Palkopoulou , M. Angelou, D. Klonidis , K. Christodoulopoulos, A. Klekamp, F. Buchali , E. Varvarigos, I. Tomkos, " Quantifying spectrum, cost, and energy efficiency in fixed-grid and flex-grid networks ", IEEE/OSA Journal of Optical Communications and Networking, Nov, 2012 [Invited]

[J48]      K. Christodoulopoulos, K. Manousakis, E. Varvarigos, " Reach Adapting Algorithms for Mixed Line Rate WDM Transport Networks ", IEEE/OSA Journal of Lightwave Technology, Vol 29, Is. 21, 2011.

[J49]      K. Christodoulopoulos, P. Kokkinos, E. Varvarigos, " Indirect and Direct Multicost Algorithms for Online Impairment-Aware RWA ", IEEE/ACM Transactions on Networking, Vol 19, Is. 6, 2011.

[J50]      K. Christodoulopoulos, I. Tomkos, E.Varvarigos , " Elastic Bandwidth Allocation in Flexible OFDM-based Optical Networks ", IEEE/OSA Journal of Lightwave Technology, 2011.

[J51]      P. Kokkinos, K. Christodoulopoulos, E. Varvarigos, " Efficient Data Consolidation in Grid Networks ", Future Generation Computer Systems, Elsevier, Vol. 27, Is. 2, 2011.

[J52]      K. Christodoulopoulos, P. Kokkinos, K. Manousakis, E. Varvarigos, " Impairment Aware RWA in optical networks: over-provisioning or cross optimization ", Journal of Networks, Special Issue on All-Optical Routing, Vol. 5, No. 11, 2010.

[J53]      K. Christodoulopoulos, K. Manousakis, E. Varvarigos, " Offline Routing and Wavelength Assignment in Transparent WDM Networks ", IEEE/ACM Transactions on Networking, Vol. 18, Is. 5, 2010.

[J54]      K. Manousakis, P. Kokkinos, K. Christodoulopoulos, E. Varvarigos, " Joint Online Routing, Wavelength Assignment and Regenerator Allocation in Translucent Optical Networks ", IEEE/OSA Journal of Lightwave Technology, Vol. 28, is. 8, pp. 1152-1163, Apr. 2010.

[J55]      T. Stevens, M. De Leenheer, C. Develder, B. Dhoedt , K. Christodoulopoulos, P. Kokkinos, E. Varvarigos, " Multi-Cost Job Routing and Scheduling in Grid Networks ", Future Generation Computer Systems, Elsevier, Vol. 25, Is. 8, pp. 912-925, Sept. 2009.

[J56]      K. Manousakis, K. Christodoulopoulos, E. Kamitsas , I. Tomkos, E. Varvarigos, " Offline Impairment-Aware Routing and Wavelength Assignment Algorithms in Translucent WDM Optical Networks ", IEEE/OSA Journal of Lightwave Technology, Vol. 27, Is. 12, pp. 1866 - 1877, June, 2009.

[J57]      K. Christodoulopoulos, K. Manousakis, E. Varvarigos, M. Angelou, " Considering Physical Layer Impairments in Offline RWA ", IEEE Network Magazine, Vol. 23, Is. 3, pp. 26-33, 2009.

[J58]      K. Christodoulopoulos, V. Sourlas , I. Mpakolas, E. Varvarigos, " A Comparison of Centralized and Distributed Meta-Scheduling Architectures for Computation and Communication Tasks in Grid Networks ", Computer Communications, Elsevier, Vol. 32, Is. 7-10, pp. 1172-1184, May 2009.

[J59]      E. Varvarigos, V. Sourlas , K. Christodoulopoulos, " Routing and Scheduling Connections in Networks that Support Advance Reservations ", Computer Networks, Elsevier, Vol. 52, no. 15, pp. 2988-3006, Oct. 2008.

[J60]      K. Christodoulopoulos, E. Varvarigos, K. Vlachos, " A new Burst Assembly Scheme based on the Average Packet Delay and its Performance for TCP Traffic ", Journal of Optical Switching and Networking, Elsevier, Vol. 4, no. 3-4, pp. 200-212, Nov. 2007.

[J61]      R. V. Caenegem , D. Colle, M. Pickavet , P. Demeester, K. Christodoulopoulos, K. Vlachos, E. Varvarigos, L. Stampoulidis , D. Roccato , R. Vilar, " The Design of an All-Optical Packet-Switching Network ", IEEE Communications Magazine, Vol. 45, no. 11, pp. 52 - 61, Nov. 2007.

[J62]      K. Christodoulopoulos, V. Gkamas , E. Varvarigos, " Statistical Analysis and Modeling of Jobs in a Grid Environment ", Journal of Grid Computing, Springer, Vol. 6, pp. 77-101, Nov. 2007.

[J63]      K. Vlachos, E. Van Breusegem , K. Christodoulopoulos, D. Colle , K. Ramantas, P. Demeester, " Constrained and Unconstrained Overspill Routing in Optical Networks: A Detailed Performance Evaluation ", Photonic Network Communications, Springer, Vol. 13, No. 3, pp. 227-240, June 2007.

[J64]      J. Aracil , N. Akar, S. Bjornstad, M. Casoni , K. Christodoulopoulos, D. Careglio , J. Fdez -Palacios, C. Gauger, O. Gonzalez de Dios, G. Hu, E. Karasan , M. Klinkowski , D. Morato, R. Nejabati, H. Overby , C. Raffaelli, D. Simeonidou , N. Stol , G. Tosi- Beleffi , K. Vlachos, " Research in Optical Burst Switching within the e-Photon/ ONe Network of Excellence ", Journal of Optical Switching and Networking, Elsevier, Vol. 4, Is. 1, pp. 1-19, Feb. 2007.

[J65]      K. Manousakis, V. Sourlas , K. Christodoulopoulos, E. A. Varvarigos, K. Vlachos, " A Bandwidth Monitoring Mechanism Enhancing SNMP to Record Timed Resource Reservations ", Journal of Network and Systems Management, Springer, Vol. 14, No. 4, pp. 583-597, Dec 2006.

[J66]      E. Kehayas , K. Vyrsokinos,L . Stampoulidis , K. Christodoulopoulos, K. Vlachos, H. Avramopoulos " ARTEMIS: A 40 Gb/s All-Optical Self-Routing Node and Network Architecture employing Asynchronous Bit and Packet-Level Optical Signal Processing ", IEEE/OSA Journal of Lightwave Technology, Vol. 24, no.8, pp. 2967-2977, Aug. 2006.

[J67]      K. Christodoulopoulos, L. SpellE > Stampoulidis , E. Kehayas , K. Vlachos, E. Varvarigos, " Efficient burst reservation protocol: a hybrid signaling protocol for efficient burst-level reservations and quality-of-service differentiation in optical burst switching networks ", OSA Journal of Optical Networking, Vol 5, Is. 3, 2006.

 

Conference Papers

 [C1]      I. Gravalos K. Christodoulopoulos, "Energy Efficient PON Traffic Coordination", IEEE International Conference on Communications (ICC), 2025.

 [C2]      P. Soumplis, K. Christodoulopoulos, K. Yiannopoulos, E. Varvarigos, "Model Predictive Control Scheduling for Extended Access Metro P2MP Optical Networks", International Conference on Transparent Optical Networks (ICTON), 2025.

 [C3]      A. Selentis-Boulntadakis, K. Christodoulopoulos, G.T. Kanellos, "Relayed vs. Switched QKD: A Comparison in Non-Uniform Ring Networks", International Conference on Optical Network Design and Modeling (ONDM), 2025.

 [C4]      P. Soumplis, K. Christodoulopoulos, K. Yiannopoulos, E. Varvarigos, "QoS-aware Resource Allocation in Point to Multipoint (P2MP) Metro Aggregation Networks", Optical Fiber Communication Conference (OFC), Th3D, 2025.

 [C5]      K. Christodoulopoulos, P. Soumplis, P. Kokkinos, A. Napoli, M. Hosseini, K. Yiannopoulos, E. Varvarigos, "Resource Allocation with Service Level Constraints in Point-to-Multipoint Metro-Core Networks", Optical Fiber Communication Conference (OFC), Th3D, 2025.

 [C6]      N. Makris, K. Tsimvrakidis, A. Papageorgopoulos, P. Konteli, Y. Gautier, M. Terenziani, E. Daudin, D. Ntoulias, T. Fragkioudakis, I. Meletios, M. Mosca, D. Hobbs, T. Rosati, I. Papastamatiou, O. Prnjat, K. Koumantaros, D. Mitropoulos, JR. Morax, B. Huttner, K. Christodoulopoulos, G. Kanellos, D. Syvridis, "Field demonstration of a fully managed, L1 encrypted 3-node network with hybrid relayed-QKD and centralized symmetric classical key management", European Conference on Optical Communication (ECOC), 2024.

 [C7]      P. Soumplis, K. Christodoulopoulos, P. Kokkinos, A. Napoli, M. Hosseini, M. Ouagliotti, E. Riccardi, A. Pagano, K. Yiannopoulos, E. Varvarigos, "Techno-economic and feasibility study of point-to-multipoint communications in the metro-core", International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP), 2024

 [C8]      P. Soumplis, K. Yiannopoulos, K. Christodoulopoulos, E. Varvarigos, "Optimizing Light-Tree and Edge Resource Placement for Diverse Latency Needs", International Conference on Transparent Optical Networks (ICTON), 2024.

 [C9]      K. Yiannopoulos, P. Soumplis, K. Christodoulopoulos, P. Kokkinos, A. Napoli, M. Hosseini, E. Varvarigos, "Enabling extended access with light-trees and point-to-multipoint coherent transceivers", International Conference on Optical Network Design and Modeling (ONDM), 2024.

[C10]      N. Makris, A. Papageorgopoulos, P. Konteli, I. Tsoni, K. Tsimvrakidis, I. Papastamatiou, K. Christodoulopoulos, G.T. Kanellos, D. Syvridis, "Relayed-QKD and switched-QKD networks performance comparison considering physical layer QKD limitations", Optical Fiber Communication Conference (OFC), M2J. 3, 2024

[C11]      G. T. Kanellos, K. Christodoulopoulos, I. Tsoni, A. Papageorgopoulos, N. Makris, P. Konteli, D. Syvridis, "Advanced key management in switched QKD networks with non-optimized QKD links", Quantum Computing, Communication, and Simulation IV, 2024

[C12]      K. Christodoulopoulos, S. Bidkar, T. Pfeiffer, R. Bonk, "Deterministically scheduled PON for industrial applications", Optical Fiber Communication Conference (OFC), Tu3F. 5, 2023

[C13]      S. Bidkar, K. Christodoulopoulos, T. Pfeiffer, R. Bonk, “Evaluating Bandwidth Efficiency and Latency of Scheduling Schemes for 5G Fronthaul Over TDM-PON”, European Conference on Optical Communications (ECOC), 2022

[C14]      K. Christodoulopoulos, S. Bidkar, W. Lautenschlaeger, T. Pfeiffer, R. Bonk, "Demonstration of Industrial-grade Passive Optical Network", Optical Fiber Communication Conference (OFC), 2022

[C15]      A. Mahajan, K. Christodoulopoulos, R. Martínez, R. Muñoz, S. Spadaro, "Adaptive and iterative QoT estimator retraining for launch power optimization", Optical Fiber Communications Conference (OFC), 2021

[C16]      F. Locatelli, K. Christodoulopoulos, J.M. Fàbrega, M.S. Moreolo, L. Nadal, S. Spadaro, "Filter Features Extraction from Optical Spectra", European Conference on Optical Communications (ECOC), 2020        

[C17]      A. Mahajan, K. Christodoulopoulos, R. Martínez, S. Spadaro, R. Muñoz, "Modelling Multi-Vendor Transponders Performance and Optimizing Launch Power”, European Conference on Optical Communications (ECOC), 2020

[C18]      A. Mahajan, K. Christodoulopoulos, R. Martinez, S. Spadaro, R. Munoz, "Improving QoT Estimation Accuracy with DGE Monitoring using Machine Learning", International Conference on Optical Network Design and Modeling (ONDM), 2020

[C19]      F. Locatelli, K. Christodoulopoulos, J.M. Fàbrega, M.S. Moreolo, L. Nadal, S. Spadaro, "Experimental Demonstration of a Machine Learning-Based in-band OSNR Estimator from Optical Spectra", International Conference on Optical Network Design and Modeling (ONDM), 2020

[C20]      K. Christodoulopoulos, W. Lautenschlaeger, F. Frick, N. Benzaoui, T. Henke, U. Gebhard, L. Dembeck, A. Lechler, Y. Pointurier, S. Bigo, "Enabling the Scalability of Industrial Networks by Independent Scheduling Domains", Optical Fiber Communications Conference (OFC), 2020

[C21]      A. Mahajan, K. Christodoulopoulos, R. Martinez, S. Spadaro, R. Munoz, "Modeling Filtering Penalties in ROADM-based Networks with Machine Learning for QoT Estimation", Optical Fiber Communications Conference (OFC), 2020

[C22]      A. Mahajan K. Christodoulopoulos, R. Martinez, S. Spadaro, R. Munoz, "Machine Learning Assisted EDFA Gain Ripple Modelling for Accurate QoT Estimation", European Conference on Optical Communication (ECOC), 2019.

[C23]      K. Kontodimas, K. Christodoulopoulos, E. Varvarigos, "Simplifying Optical DCN Fabrics with Blocking Space Switching and Wavelength-Constrained WDM", International Conference on Optical Network Design and Modeling (ONDM), 2019.

[C24]      C. Delezoide, K. Christodoulopoulos, A. Kretsis, N. Argyris, G. Kanakist, A. Sgambelluri, N. Sambo, P. Giardina, G. Bernini, D. Roccato, A. Percelsi, R. Morro, H. Avramopoulos, E. Varvarigos, P. Castoldi, P. Layec, S. Bigο, "Field trial of marginless operations of an optical network facing ageing and performance fluctuations", European Conference on Optical Communication (ECOC), 2018.

[C25]      K. Tokas, C. Spatharakis, I. Patronas, P. Bakopoulos, G. Landi, K. Christodoulopoulos, M. Capitani, A. Kyriakos, M. Aziz, R. Pitwon, D. Gallico, D. Reisis, E. Varvarigos, E. Zahavi, H. Avramopoulos, "Real time demonstration of an end-to-end optical datacenter network with dynamic bandwidth allocation", European Conference on Optical Communication (ECOC), 2018.

[C26]      I. Sartzetakis, K. Christodoulopoulos, E. Varvarigos, "Formulating QoT estimation with machine learning", European Conference on Optical Communication (ECOC), 2018.

[C27]      N. Sambo, K. Christodoulopoulos, N. Argyris, P. Giardina, C. Delezoide, D. Roccato, A. Percelsi, R. Morro, A. Sgambelluri, G. Kanakis, G. Bernini, P. Castoldi, "Dynamic (re) configuration of optical networks based on monitoring information: field trial", Photonic Networks and Devices Conference, 2018.

[C28]      K. Kontodimas, K. Christodoulopoulos, E. Zahavi, E. Varvarigos, "Resource allocation in slotted optical data center networks", International Conference on Optical Network Design and Modeling (ONDM), 2018.

[C29]      I. Patronas, N. Gkatzios, V. Kitsakis, D. Reisis, K. Christodoulopoulos, E. Varvarigos, “Scheduler Accelerator for TDMA Data Centers”, Parallel, Distributed and Network-based Processing Conference (PDP), 2018.

[C30]      N. Sambo, K. Christodoulopoulos, N. Argyris, P. Giardina, C. Delezoide, A. Sgambelluri, A. Kretsis, G. Kanakis, F. Fresi, G. Bernini, H. Avramopoulos, E. Varvarigos, P. Castoldi, ”Experimental demonstration of fully disaggregated white box including different types of transponders and monitors, controlled by NETCONF and YANG”, Optical Fiber Communication Conference (OFC), 2018.

[C31]      K. Christodoulopoulos, N. Sambo, N. Argyris, P. Giardina, G. Kanakis, A. Kretsis, F. Fresi, A. Sgambelluri, G. Bernini, C. Delezoide, F. Cugini, H. Avramopoulos, E. Varvarigos, “Observe-Decide-Act: Experimental Demonstration of a Self-Healing Network”, Optical Fiber Communication Conference (OFC), 2018.

[C32]      G. Landi, M. Capitani, A. Kretsis, P. Kokkinos, K. Christodoulopoulos, E. Varvarigos “Joint Intra-and Inter-Datacenter Network Optimization and Orchestration”, Optical Fiber Communication Conference (OFC), 2018.

[C33]      P. Bakopoulos, K. Tokas, C. Spatharakis, I. Patronas, G. Landi, K. Christodoulopoulos, M. Capitani, A. Kyriakos, M. Aziz, D. Reisis, E. Varvarigos, E. Zahavi, H. Avramopoulos, “Optical datacenter network employing slotted (TDMA) operation for dynamic resource allocation”, Optical Interconnects, SPIE, 2018.

[C34]      N. Sambo, P. Giardina, I. Sartzetakis, A. Sgambelluri, F. Fresi, M. Dallaglio, G. Meloni, G. Bernini, K. Christodoulopoulos, P. Castoldi, E. Varvarigos, “Experimental demonstration of network automation based on QoT estimation and monitoring in both single-and multidomains”, European Conference and Exhibition on Optical Communications (ECOC), 2017.

[C35]      I. Sartzetakis, K. Christodoulopoulos, E. Varvarigos, "On reducing optical monitoring uncertainties and localizing soft failures", IEEE International Conference on Communications (ICC), 2017.

[C36]      P. Papanikolaou, K. Christodoulopoulos, E. Varvarigos, "Incremental planning of multi-layer elastic optical networks", International ConferenceOptical Network Design and Modeling (ONDM), 2017.

[C37]      G. Landi, M. Capitani, K. Christodoulopoulos, D. Gallico, M. Biancani, M. Aziz, "An Application-Aware SDN Controller for Hybrid Optical-Electrical DC Networks", ICN 2017

[C38]      I. Sartzetakis, K. Christodoulopoulos, E. Varvarigos, "QoT aware adaptive elastic optical networks", Optical Fiber Communication Conference (OFC), 2017.

[C39]      G Landi, I Patronas, K Kontodimas, M Aziz, K Christodoulopoulos, A. Kyriakos, M. Capitani, A. F. Hamedani, D. Reisis, E. Varvarigos, P. Bakopoulos, H. Avramopoulos, "SDN control framework with dynamic resource assignment for slotted optical datacenter networks", Optical Fiber Communications Conference (OFC), 2017.

[C40]      P. Soumplis, K. Christodoulopoulos, M. Quagliotti, A. Pagano, E. Varvarigos, "Actual margins algorithm for multi-period planning", Optical Fiber Communication Conference (OFC), 2017.

[C41]      M. Aziz, H.A. Fazely, G. Landi, D. Gallico, K. Christodoulopoulos, P. Wieder, "SDN-enabled application-aware networking for data center networks", IEEE International Conference on Electronics, Circuits and Systems (ICECS), 2016.

[C42]      K. Christodoulopoulos, K. Kontodimas, A. Siokis, K. Yiannopoulos, E. Varvarigos, "Collisions free scheduling in the NEPHELE hybrid electrical/optical datacenter interconnect", IEEE International Conference on Electronics, Circuits and Systems (ICECS), 2016.

[C43]      I. Gravalos, P. Makris, K. Christodoulopoulos, E. Varvarigos, "Efficient Gateways Placement for Internet of Things with QoS Constraints", IEEE Global Communications Conference (GLOBECOM), 2016.

[C44]      P. Papanikolaou, K. Christodoulopoulos, E. Varvarigos, “Joint Multilayer Planning of Survivable Elastic Optical Networks”, Optical Fiber Communication Conference (OFC), M2K. 3, 2016.

[C45]      K. Christodoulopoulos, N. Sambo, E. Varvarigos, “Exploiting Network Kriging for Fault Localization”, Optical Fiber Communication Conference (OFC), W1B. 5, 2016.

[C46]      I. Sartzetakis, K. Christodoulopoulos, C. Tsekrekos, D. Syvridis, E. Varvarigos, “Estimating QoT of Unestablished Lightpaths”, Optical Fiber Communication Conference (OFC), Tu3F. 2, 2016.

[C47]      A. Di Giglio, A. Pagano, K. Christodoulopoulos, P. Kokkinos, N. Argyris, C. Spatharakis, S. Dris, H. Avramopoulos, J-C. Antona, C. Delezoide, P. Jenneve, J. Pesic, Y. Pointurier, P. Castoldi, N. Sambo, G. Bernini, G. Carrozzo, E. Varvarigos, “Cross-layer, dynamic network orchestration, leveraging software-defined optical performance monitors”, AEIT Italian Conference on Photonics Technologies (Fotonica), 2015

[C48]      P. Papanikolaou, K. Christodoulopoulos, E. Varvarigos, "Multilayer flex-grid network planning", International Conference on Optical Network Design and Modeling, (ONDM), 2015.

[C49]      J.M. Fabrega, M. Moreolo, J.J. Vilchez, K. Christodoulopoulos, E. Varvarigos, J.P. Fernandez-Palacios, "Experimental validation of MTU-BRAS connectivity with DMT transmission and coherent detection in flexgrid metro networks using sliceable transceivers", Optical Fiber Communication conference (OFC), 2015.

[C50]      S. Markou, A. Siokis, P. Maniotis, K. Christodoulopoulos, E. Varvarigos, N. Pleros, "Performance analysis and layout design of optical blades for HPCs using the OptoBoard-Sim simulator", IEEE Optical Interconnects (OI), 2015.

[C51]      V. Gkamas, K. Christodoulopoulos, E. Varvarigos, "Energy-Aware Multi-layer Flexible Optical Network Operation", International Conference on Software, Telecommunications and Computer Networks (SoftCOM), 2015.

[C52]      P. Soumplis, K. Christodoulopoulos, E. Varvarigos, "Dynamic connection establishment and network re-optimization in flexible optical networks",International Conference on Optical Network Design and Modeling (ONDM), 2014.

[C53]      P. Soumplis, P. Papanikolaou, K. Christodoulopoulos, G. Papadimitriou, E. Varvarigos, "Energy minimization design of fixed-and flex-grid optical networks", Computer Aided Modeling and Design of Communication Links and Networks (CAMAD), 2014.

[C54]      K. Yiannopoulos, E. Varvarigos, V. Katopodis, K. Christodoulopoulos, I. Lazarou, P. Bakopoulos, H. Avramopoulos, D. Klonidis, I. Tomkos, P. Dimos, G. Heliotis, "Coverage capabilities of a multi-wavelength passive optical network architecture", Computer Aided Modeling and Design of Communication Links and Networks (CAMAD), 2014.

[C55]      A. Siokis, K. Christodoulopoulos, E. Varvarigos, "Laying out interconnects on optical printed circuit boards", ACM/IEEE symposium on Architectures for networking and communications systems (ANCS), 2014.

[C56]      M. S. Moreolo, J.M. Fabrega, F.J. Vilchez, K Christodoulopoulos, E. Varvarigos, V. Lopez, J.P. Fernandez-Palacios, "Assessment of Flexgrid Technologies in the MAN for Centralized BRAS Architecture Using S-BVT", European Conference on Optical Communication (ECOC), 2014

[C57]      C. Papageorgiou, K. Christodoulopoulos, N. Doulamis, E. Varvarigos, "On Least Expected Transmissions multicasting in wireless networks", International Conference on Computing, Networking and Communications (ICNC), 2014

[C58]      D. Lugones, K. Christodoulopoulos, K. Katrinis, M. Ruffini, D. O Mahony, M. Collier, "Accelerating communication-intensive parallel workloads using commodity optical switches and a software-configurable control stack", European Conference on Parallel and Distributed Computing (Europar), 2013.

[C59]      E. Palkopoulou, I. Stiakogiannakis,D. Klonidis, K. Christodoulopoulos, E. Varvarigos, O. Gerstel, I. Tomkos, "Dynamic Cooperative Spectrum Sharing in Elastic Networks", Optical Fiber Communications Conference (OFC), 2013.

[C60]      K. Christodoulopoulos, P. Soumplis, E. Varvarigos, "Trading off Transponders for Spectrum in Flexgrid Networks", Optical Fiber Communications Conference (OFC), 2013.

[C61]      K. Christodoulopoulos, K. Katrinis, M. Ruffini, D O Mahony, "Topology Configuration in Hybrid EPS/OCS Interconnects", European Conference on Parallel and Distributed Computing (Europar), 2012.

[C62]      K. Christodoulopoulos, E. Varvarigos, "Routing and Spectrum Allocation Policies for Time-Varying Traffic in Flexible Optical Networks", International Conference on Optical Networking Design and Modeling (ONDM), 2012.

[C63]      M. Angelou, K. Christodoulopoulos, D. Klonidis, A. Klekamp, F. Buchali, E. Varvarigos, I. Tomkos, "Spectrum, Cost and Energy Efficiency in Fixed-Grid and Flex-Grid Networks", Optical Fiber Communications Conference (OFC) 2012.

[C64]      K. Christodoulopoulos, I. Tomkos, E. Varvarigos, "Dynamic Bandwidth Allocation in Flexible OFDM-based Networks", Optical Fiber Communications Conference (OFC), 2011.

[C65]      K. Christodoulopoulos, K. Manousakis, E. Varvarigos, "Adapting the Transmission Reach in Mixed Line Rates WDM Transport Networks", International Conference on Optical Network Design and Modeling, (ONDM), 2011.

[C66]      K. Christodoulopoulos, I. Tomkos, E. Varvarigos, "Routing and Spectrum Allocation in OFDM-based Optical Networks with Elastic Bandwidth Allocation", IEEE Global Conference on Communications (GLOBECOM), 2010.

[C67]      K. Christodoulopoulos, I. Tomkos, E. Varvarigos, "Spectrally/Bitrate Flexible Optical Network Planning", European Conference on Optical Communication (ECOC), 2010.

[C68]      De Groote, K. Manousakis, P. Kokkinos, D. Colle, M. Pickavet,K. Christodoulopoulos, E. Varvarigos, P. Demeester, "Cost comparison of different Translucent Optical Network Architectures", Conference of Telecommunication, Media and Internet Techno-Economics (CTTE),2010.

[C69]      P. Kokkinos, K. Christodoulopoulos, K. Manousakis, E. Varvarigos, "Multi-Parametric Online RWA based on Impairment Generating Sources", IEEE Global Conference on Communications (GLOBECOM), Honolulu, USA, Dec. 2009.

[C70]      K. Christodoulopoulos, K. Manousakis, M. Angelou, I. Tomkos, E. Varvarigos, "A Multicost Approach to Online Impairment-Aware RWA", IEEE International Conference on Communications (ICC), Dresden, Germany, June 2009.

[C71]      K. Christodoulopoulos, K. Manousakis, E Varvarigos, "Cross-layer Optimization of Static Lightpath Demands in Transparent WDM Optical Networks", IEEE Information Theory Workshop (ITW), Volos, Greece, May 2009.

[C72]      K. Manousakis, K. Christodoulopoulos, E. Varvarigos, "Impairment-Aware Offline RWA for Transparent Optical Networks", IEEE Conference on Computer Communications (INFOCOM), Rio De Janeiro, Brazil, April 2009.

[C73]      K. Christodoulopoulos, K. Manousakis, E. Varvarigos, "Comparison of Routing and Wavelength Assignment Algorithms in WDM Networks", IEEE Global Telecommunications Conference (GLOBECOM), New Orleans, USA, Dec. 2008.

[C74]      E. Varvarigos, V. Sourlas, K. Christodoulopoulos, "Routing and Scheduling Sessions in Networks that Support Advance Reservations", International Conference on Broadband Communications, Networks and Systems (BROADNETS), London, U.K., Sept. 2008.

[C75]      K. Christodoulopoulos, N. Doulamis, E. Varvarigos, "Joint Communication and Computation Task Scheduling in Grids", IEEE/ACM International Symposium on Cluster Computing and the Grid (CCGrid), Lyon, France, May 2008.

[C76]      P. Kokkinos, K. Christodoulopoulos, A. Kretsis, E. Varvarigos, "Data Consolidation: A Task Scheduling and Data Migration Technique for Grid Networks", IEEE/ACM International Symposium on Cluster Computing and the Grid (CCGrid), Lyon, France, May 2008.

[C77]      K. Christodoulopoulos, E. Varvarigos, C. Develder,M. Leenheer, B. Dhoedt, "Job Demand Models For Optical Grid Research", International Conference on Optical Networking Design and Modeling (ONDM),Athens, Greece, May 2007.

[C78]      K. Christodoulopoulos, V. Gkamas, E. Varvarigos, "Delay Components of Job Processing in a Grid: Statistical Analysis and Modeling", International Conference on Networking and Services (ICNS), Athens, Greece, 2007.

[C79]      M. Oikonomakos, K. Christodoulopoulos, E. Varvarigos, "Profiling Computation Jobs in Grid Systems", IEEE/ACM International Symposium on Cluster Computing and the Grid (CCGrid), Rio De Janeiro, Brazil, May 2007.

[C80]      K. Christodoulopoulos, K. Vlachos, K. Yiannopoulos, E. Varvarigos, "Relaxing Delayed Reservations: An approach for QoS provision and service differentiation in Optical Burst Switching networks", International Conference on Broadband Communications, Networks and Systems (BROADNETS), San Jose, USA, Oct. 2006.

[C81]      K. Ramantas, K. Christodoulopoulos, K. Vlachos, E. Van Breusegem, M. Pickavet, "SLIP-N Architecture: A new Hybrid Optical Switching Scheme", International Conference on Broadband Communications, Networks and Systems (BROADNETS), San Jose, USA, Oct. 2006.

[C82]      K. Christodoulopoulos, E. V. Breusegem, K. Vlachos, M. Pickavet, E. Varvarigos, D. Colle, "Performance Evaluation of Overspill Routing in Optical Networks", IEEE International Conference on Communications (ICC), Istanbul, Turkey, June 2006.

[C83]      L. Stampoulidis, E. Kehayas, K. Vyrsokinos, K. Christodoulopoulos, D. Tsiokos, Bakopoulos, T. Kanellos, K. Vlachos, E. A. Varvarigos and H. Avramopoulos, "ARTEMIS: A 40 Gb/s All-Optical Self-Routing Node and Network Architecture employing Asynchronous Bit and Packet-Level Optical Signal Processing", IEEE Global Telecommunications Conference (GLOBECOM), St. Louis, USA, Dec. 2005.

[C84]      K. Vyrsokinos, E Kehayas, L. Stampoulidis, H. Avramopoulos, K. Christodoulopoulos, K. Vlachos, E. A. Varvarigos, “ARTEMIS: A New Architecture for All-Optical Asynchronous Self-Routing Network with Efficient Contention Protection and QoS Differentiation”, European Conference on Optical Communication (ECOC), 2005.

 

Posters

[P1]      P. Soumplis, K. Christodoulopoulos, P. Kokkinos, M. Quagliotti, A. Di Giglio, A. Napoli, M. Hosseini, K. Yiannopoulos, E. Varvarigos, "Optimization of router cost and consumption in a point-to-multipoint metro-core architecture", Optical Fiber Communication Conference (OFC), W2A. 45, 2025.

[P2]      K. Christodoulopoulos, N. Makris, G.T. Kanellos, D. Syvridis, "Optimizing Key Consumption in Switched QKD Networks", Optical Fiber Communication Conference (OFC), W2A. 34, 2024.

[P3]      K. Christodoulopoulos, P. Soumplis, I. Sartzetakis, M. Quagliotti, A. Di Giglio, A. Pagano, N. Argyris, C. Spatharakis, S. Dris, H. Avramopoulos, JC. Antona, C. Delezoide, P. Jennevé, J. Pesic, Y. Pointurier, N. Sambo, F. Cugini, P. Castoldi, G. Bernini, F. Moscatelli ,G. Carrozzo, E. Varvarigos, " ORCHESTRA- Optical performance monitoring enabling flexible networking", European Conference on Networks and Communications (EuCNC), 2016.

[P4]      N. Sambo, K. Christodoulopoulos, P. Castoldi, E. Varvarigos, " Spectrum sharing for elastic transmission parameter adaptation", European Conference on Optical Communication (ECOC), 2016.

[P5]      V. Gkamas, K. Christodoulopoulos, E. Varvarigos, "A comparison study of joint and sequential multi-layer planning for IP over flexible optical networks", Optical Fiber Communications Conference (OFC), 2015.

[P6]      K. Christodoulopoulos, K. Katrinis, M. Ruffini, D. O'Mahony, "Accelerating HPC workloads with dynamic adaptation of a software-defined hybrid electronic/optical interconnect", Optical Fiber Communication Conference (OFC), 2014.

[P7]      K. Christodoulopoulos, M. Angelou, P. Zakynthinos, D. Klonidis, E. Varvarigos, I. Tomkos, "The Value of Flexible Optical Networking, poster", ECOC, 2011

[P8]      K. Manousakis, K. Christodoulopoulos, E. Varvarigos, "Avoiding Adjacent Channel Interference in Static RWA", 6th International Symposium on communication systems, networks and digital signal processing (CSNDSP) Graz, Austria, 2008.

[P9]      K. Christodoulopoulos, N. Doulamis, E.Varvarigos "Joint Communication and Computation Task Scheduling in Grids", 3rd E-science Conference, 2007. (Best poster award).

[P10]  K. Christodoulopoulos, E. Varvarigos "Statistical Analysis of the Workload and Modeling of the Time a Job Spends at Different States in the LCG/EGEE Environment", EGEE Conference, 2007.

 

Demos

[D1] K. Christodoulopoulos, S. Bidkar, Th. Pfeiffer, R. Bonk, “Proof-of-Concept Demonstration of Time Critical Periodic Traffic in Industry-grade Passive Optical Networks”, OFC 2022

 

Invited Talks

[I1]        A. Selentis, K. Christodoulopoulos, G.T. Kanellos, "Comparing Relayed and Switched QKD in Ring Networks", International Conference on Transparent Optical Networks (ICTON), 2025.

[I2]        K. Christodoulopoulos, “Scaling Industrial Networks with Independent Scheduling Domains”, Workshop: 5G: new industrial revolution or only higher bandwidth?, International Conference on Optical Network Design and Modeling (ONDM), 2020.

[I3]        K. Christodoulopoulos, K. Kontodimas, L. Dembeck, E. Varvarigos, "Slotted Optical Datacenter Networks with Sub-Wavelength Resource Allocation", Optical Fiber Communication Conference (OFC), 2019.

[I4]        K. Christodoulopoulos, I. Sartzetakis, P. Soumplis, E. Varvarigos, "Machine Learning Assisted Quality of Transmission Estimation and Planning with Reduced Margins", International Conference on Optical Network Design and Modeling (ONDM), 2019.

[I5]        A. Kretsis, P. Soumplis, K. Christodoulopoulos, E. Varvarigos, "DEPLOY Tool: Incrementally Planning Marginless Elastic Optical Networks", International Conference on Transparent Optical Networks (ICTON), 2018.

[I6]        K. Christodoulopoulos, I. Sartzetakis, P. Soumplis, E. Varvarigos, "Cross-layer and dynamic network orchestration based on optical performance monitoring", International Conference onOptical Network Design and Modeling (ONDM), 2017.

[I7]        I. Sartzetakis, K. Christodoulopoulos, E. Varvarigos, "Improving QoT estimation accuracy through active monitoring", International Conference on Transparent Optical Networks (ICTON), 2017.

[I8]        K. Yiannopoulos, K. Kontodimas, K. Christodoulopoulos, E. Varvarigos, "Resource partitioning in the NEPHELE datacentre interconnect", International Conference on Transparent Optical Networks (ICTON), 2017.

[I9]        A. Kretsis, L. Corazza, K. Christodoulopoulos, P. Kokkinos, E. Varvarigos, “An emulation environment for SDN enabled flexible IP/optical networks”, International Conference on Transparent Optical Networks (ICTON), 2016

[I10]    K. Christodoulopoulos, K. Kontodimas, K. Yiannopoulos, E. Varvarigos, “Bandwidth allocation in the NEPHELE hybrid optical interconnect”, International Conference on Transparent Optical Networks (ICTON), 2016

[I11]    K. Christodoulopoulos, E. Varvarigos, "Evaluating flexibility degrees in optical networks", Optical Fiber Communication Conference (OFC), 2015.

[I12]    K. Christodoulopoulos, P. Kokkinos, A. Di Giglio, A. Pagano, N. Argyris, C. Spatharakis, S. Dris, H. Avramopoulos, JC. Antona, C. Delezoide, P. Jenneve, J. Pesic, Y. Pointurier, N. Sambo, F. Cugini, P. Castoldi, G. Bernini , G. Carrozzo, and E. Varvarigos, "ORCHESTRA - Optical performance monitoring enabling flexible networking", International Conference on Transparent Optical Networks (ICTON), 2015.

[I13]    P. Soumplis, P. Papanikolaou, K. Christodoulopoulos, N. Argyris, C. Spatharakis, S. Dris, H. Avramopoulos, E. Varvarigos, "Cross-layer optimization: Network cost vs. physical layer margins", International Conference on Transparent Optical Networks (ICTON), 2015.

[I14]    E. Varvarigos, K. Christodoulopoulos, "Algorithmic challenges in flexible optical networks", International Conference on Computing, Networking and Communications (ICNC), 2014.

[I15]    A. Siokis, K. Christodoulopoulos, E. Varvarigos, "On-OPCB interconnection networks", International Conference on Transparent Optical Networks (ICTON), 2014.

[I16]    A. Kretsis, P. Kokkinos, K. Christodoulopoulos, E. Varvarigos, "Mantis: Optical network planning and operation tool", International Conference on Transparent Optical Networks (ICTON), 2013.

[I17]    E. Varvarigos, K. Christodoulopoulos, Static and dynamic spectrum allocation in flexi-grid optical networks", International Conference on Transparent Optical Networks, (ICTON), 2012.

[I18]    E. Varvarigos, K. Christodoulopoulos, "Algorithmic aspects of optical network design", International Conference on Optical Network Design and Modeling, (ONDM), 2011.

[I19]    K. Christodoulopoulos, "Elastic Bandwidth Allocation in Flexible OFDM-based Optical Networks", Workshop on Cross-layer Algorithms and Protocols for Optical Networks, International Conference on Broadband Communications, Networks and Systems (BROADNETS), Athens, Greece, Oct. 2010.

[I20]    K. Christodoulopoulos, P. Kokkinos, K. Manousakis, E. Varvarigos, " Cross Layer RWA in WDM Networks: Is the Added Complexity Useful or a Burden?, International Conference on Transparent Optical Networks, (ICTON), Azores, Portugal, July 2009.

[I21]    K. Christodoulopoulos, I. Tomkos, E. Varvarigos, "A Comparison of Offline IARWA Approaches", Networks and Optical Communications - Optical Cabling and Infrastructure (NOC-OCI), Valladolid, Spain, June 2009.

[I22]    K. Christodoulopoulos, E. Varvarigos, "Routing and Scheduling in Grids", International Conference on Transparent Optical Networks (ICTON), 2008.

 

Invited Talks (collaborator)

[I1]        C. Delezoide, K. Christodoulopoulos, A. Kretsis, N. Argyris, G. Kanakis, A. Sgambelluri, N. Sambo, P. Giardina, G. Bernini, D. Roccato, A. Percelsi, R. Morro, H Avramopoulos, E Varvarigos, P Castoldi, P Layec, S Bigo, "Pre-emptive detection and localization of failures towards marginless operations of optical networks", International Conference on Transparent Optical Networks (ICTON), 2018.

[I2]        P. Castoldi, G. Bernini, K. Christodoulopoulos, F. Cugini, N. Sambo, “A monitoring architecture for self-configurable optical networks”, International Conference on Transparent Optical Networks (ICTON), 2015

 

 

Patents

 

[Pat1]      P. Tsiaflakis, K. Christodoulopoulos, S. Bidkar, "Bandwidth Allocation", United States Patent US12317013B2, issued 2025-05-27.

[Pat2]      C. Delezoide, K. Christodoulopoulos, T. Zami, M. L.E. Monnier, "Tuning multiple laser sources in an optical network ", European Patent office, EP3866360A1, issued 2021-08-18.