Researcher Scientists
 

DIMITRIOS KLONIDIS, Ph.D., MSc, Research Scientist

Researcher at AIT

CONTACT DETAILS


Athens Information Technology
19.5 Km Markopoulo Avenue,
19002 Peania, Attiki, Greece
P.O. Box 68
Phone: +302106682773
Fax:    +302106682729
E-mail: dikl(at)ait(dot)edu(dot)gr


SUMMARY OF QUALIFICATIONS

Dr. Dimitrios Klonidis was awarded his PhD degree in the field of optical communications and networking from the University of Essex, UK in 2006. He received his MSc degree in Telecommunication and Information Systems from the same university and his first degree of Electrical and Computer Engineering from the Aristotle University of Thessaloniki, Greece in 1998.
He was the main researcher on the UK’s research council OPSnet project which has been successfully completed in August 2004 demonstrating asynchronous switching technology of ultra fast optical packets. Afterwards, he worked on the development of the ultra-fast transmission and switching testbed for the UK’s research council UPC project, while he participated on a number of national and EU projects.
In September 2005, he joined the high-speed Networks and Optical Communications (NOC) group in AIT as a faculty member and senior researcher.
He is a member of the IEEE society and he serves as a reviewer on major IEEE and IEE journals in the area of optical communications. He has invited presentations in international conferences and workshops. In 2004 he received a grand and the best paper award from the IEEE-OECC conference comity. The same year he presented his final work on OPSnet project as a post-deadline paper at ECOC conference.
His main research interests are in the area of ultra-fast photonic networks, including optical transmission and modulation, fast switching, high speed optical processing and fast node control. The considered networking applications include high capacity SONET/SDH, Optical Packet/Burst Switched and Grid Computing Networks.

 

PROFESSIONAL EXPERIENCE

Sept. 2005 – Present: Athens Information Technology Athens, Greece
Position: Research Scientist, Member of the Networks and Optical Communications Group.

Oct. 2004 – Sept. 2005: Photonic Networks Research Lab, University of Essex, UK
Position: Senior Research Officer – UPC project
- Project UPC (Ultra-fast Photonics Collaboration):
UK-EPSRC funded project in collaboration with St. Andrews, Cambridge, Bristol, Heriot-Watt, Glasgow and Imperial Universities. The project investigates various technological approaches for the generation of ultra-short (femto-second) optical pulses and applications in ultra-high speed networking at 160Gb/s.
- Responsible for the development of network applications for high speed transmission at 160Gb/s. This include dispersion management of short optical pulses for 160Gb/s IM and PM transmission, switching using reconfigurable OXCs, development of time slot add/drop multiplexers, clock extraction and investigation of regenerative schemes at 40 and 160Gb/s.
- High speed time demultiplexing has been achieved at 40Gb/s using the puss-pull scheme in an MZI interferometre and the FWM scheme in an SOA.
- Dispersion and slope compensation achieved IM transmission at 160 Gb/s over ~120km.

Oct. 2001 – Oct. 2004: Photonic Networks Research Lab, University of Essex, UK
Position: Senior Research Officer – OPSnet project
- Project OPSnet (Optical Packet Switched networks):
UK-EPSRC funded project in collaboration with Cambridge University and University of Strathclyde and a number of industrial partners (BT-Exact, Marconi, Fujitsu).
- Responsible for the analysis, development and demonstration of an asynchronous optical packet switch for the core optical network able to support high bit rate payload transmission in excess of 100Gb/s. This included: Asynchronous and variable length packet generation at 40Gb/s, DPSK label decoding, address identification and control set-up, fast tunable laser control, dual-pump FWM wavelength conversion and routing through AWG, packet time demultiplexing with EAM and BER measurements at the packet level.
- Substantial laboratory experience was gained operating in a demanding gating mode many types of digital and optoelectronic devices, including state of the art 10G pattern generators and BER testers, fast sampling oscilloscopes, pulsating pico-second sources, MZI and fast FPGA based controllers.


Additional Work experience
 

  • Contribution to national projects (funded by EPSRC)
    OPORON project: Development of an edge optical packet switched router. Responsible for the electronic to optical interface and the interconnection with the core network.

    PRINCE project: Development of special optoelectronic devices (MZI, EAM, SOA, Tunable laser) by CIP. Responsible for the testing and evaluation of devices and their applications in networking.

  • Graduate teaching assistant:
    MSc short courses related to optical networks and technologies: EE934 – WDM Networks, EE941 Future photonic networks.
    BSc and MSc Project supervisor:

    Responsible for a number of under- and post-graduate projects in the area of optical networks, packet switching and optical processing, both experimental (EDFA design, tunable laser control, ring laser design) and theoretical using VPI simulator (high speed transmission, OCDMA, MZI).

EDUCATION

  • 2001 – 2005 Photonic Networks Research Lab., University of Essex, UK
    PhD in High speed photonic networks
    Subject:
    Optical labelling and data processing techniques for high speed asynchronous optical packet switched nodes.
    Objectives:
    - Investigation of special all-optical labelling techniques for optical packets transmitted at high bit rates beyond 40Gb/s. (Techniques investigated: Sub-Carrier Modulation, Optical Code base Labelling, DPSK decoding schemes)
    - Development, analysis and implementation of a special labelling scheme based on DPSK decoding
    - Development of header extraction and electronic control for wavelength switching based on fast tunable laser.
     -Experimental investigation of high speed all-optical processing schemes for wavelength conversion, clock extraction and signal regeneration.
    - Implementation of the labelling scheme and control on an ultra fast wavelength conversion scheme (>40Gb/s) based on tunable laser controlled dual-pump FWM.
  • 2000 – 2001, University of Essex
    MSc in Telecommunications and Information Systems
    Final Project: Multi-user detectors for 3G receivers.
    Taught subjects:
    - Signal Theory and modulation
    - Communication Systems (Principles of digital transmission, PCM, SDH, GSM, Modems, Satellite systems)
    - Optical Networks (Transmission techniques, WDM, OFDM, optical components, switches OXCs, Optical Packet Switching)
    - ATM networks (Principles of ATM, Switches, MPLS, IP over ATM)
    - Telephony networks, traffic analysis and simulation
    - Data networks (TCP/IP, routing, broadcasting).
  • 1993 – 1998, Aristotle University of Thessaloniki,
    BSc (5-year scheme) in Electrical and Computer Engineering
    Specialized in Telecommunications
    Final Project: Processing, analysis and characterisation of heart sounds using higher order spectra analysis.
    Taught Subjects: DSP (Analogue and Digital Systems, Stochastic Processes), Image Processing, Telecommunication Systems (Modulation, Transmission, Channel Optimisation), Field and Propagation Theory, Antennas, Microwaves, Telephony Networks, Mobile Telephony.
     

AWARDS AND ACHIEVEMENTS

Paper award:
Best paper award at OECC 2004, Yokohama, Japan for the work on a novel DPSK based labelling extraction scheme.

Post-deadline paper:
Presented at ECOC 2004, Stockholm, Sweden. Paper Th4.4.5: “Demonstration of a fully functional and controlled optical packet switch at 40Gb/s”.

Invited talks:

  • OECC 2004 – Workshop on optical packet and burst switching, “OPSnet: Architecture and design issues for an asynchronous ultra-fast optical packet switch”
  • OFC 2005 – Workshop on all-optical wavelength conversion and signal processing for next generation networks, “A FWM based OPS router – The OPSnet approach for a fast optical packet switched network”
  • ICTON 2005 – Session on Optical Packet Switching, “Optical Packet Switched architectures and technologies for future high speed networks”.
  • NOC 2005 – Session on Optical Packet Switching, “Managing the optical packet in a fast and asynchronous way”.
  • APOC 2005 (SPIE) – Session on future networks, “Optical Packet Switch Architectures for Ultra High Speed Networks”.

Paper reviewer:
Serve as paper reviewer for IEEE photonics technology letters, IEEE journal of Lightwave technology and IEE electronics letters and journal of optoelectronics.

 

PUBLICATIONS

Journals

  • C. T. Politi, D. Alexandropoulos, D. Klonidis, M. O’Mahony and A. Stavdas, “Concatenation performance of optical packet switches that incorporate wavelength converters based on FWM in SOAs”, to be published at IEE Proceedings in Optoelectronics
  • Christina (Tanya) Politi, Dimitrios Klonidis, Anna Tzanakaki, Mike O’Mahony, and Ioannis Tomkos, “Waveband routed optical packet switch: implementation and performance evaluation”, SPIE Opt. Eng. 45, 050504, May 2006.
  • M. De Leenheer, P. Thysebaert, B. Volckaert, F. De Turck, B. Dhoedt, P. Demeester, D. Simeonidou, R. Nejabati, G. Zervas, D. Klonidis, M.J. O'Mahony, “A view on enabling-consumer oriented grids through optical burst switching”, IEEE Communications Magazine, vol.44, no.3, pp. 124-131, Mar. 2006.
  • C. Politi, D. Klonidis, M.J. O'Mahony, “Waveband Converters Based on Four-Wave Mixing in SOAs”, IEEE Journal of Lightwave Technology, vol. 24, no. 3, pp. 1203-1217, Mar. 2006.
  • C. (T.) Politi, D. Klonidis, M. O’Mahony: “Dynamic Behaviour of Wavelength Converters based on FWM in SOAs” IEEE JQE, vol.42, no.2, pp.108-125, Feb. 2006.
  • Dimitrios Klonidis, Christina (T.) Politi, Reza Nejabati, Mike J. O’Mahony and Dimitra Simeonidou, “OPSnet: Design and demonstration of an asynchronous high speed optical packet switch”, IEEE Journal of Lightwave Technology, vol. 23, no. 10, pp. 2914-25, Oct. 2005.
  • Dimitra Simeonidou, Reza Nejabati, Dimitrios Klonidis, Georgios Zervas, Anna Tzanakaki, Mike J. O’Mahony, “Dynamic Optical Network Architectures and Technologies for Existing and Emerging Grid Services”, IEEE Journal of Lightwave Technology, vol. 23, no. 10, pp. 3347-57, Oct. 2005.
  • C. (T) Politi (1), A. Tzanakaki (2), D Klonidis(1), M. O’Mahony (1), I. Tomkos (2), “Optical Cross-Connect Architecture Using Waveband Conversion and a Passive Wavelength Router”, IEE Proceedings in Optoelectronics, vol. 152, no. 4, pp.215-221, August 2005.
  • Reza Nejabati, Dimitris Klonidis, Dimitra Simeonidou, Mike O’Mahony, “Demonstration of an Agile Hybrid IP-Optical Packet Construction Mechanism in Wavelength Routed Optical Packet Switched Networks”, IEEE Communications Letter, vol.9, no.6, pp.552-554, June 2005.
  • D. Klonidis, C.(T.) Politi, R. Nejabati, M.J. O’Mahony, D. Simeonidou, “Header extraction and control for an asynchronous optical packet switch based on DPSK decoding”, IEICE Transactions on Communications vol.E88-B, no 5, pp.1876-1883, May 2005.
  • Dimitrios Klonidis, Christina T. Politi, Michael O’Mahony, Dimitra Simeonidou, “Fast and Widely Tunable Optical Packet Switching Scheme Based on Tunable Laser and Dual-pump Four Wave Mixing”, IEEE Photonics Technology Letters, vol.16, no.5, May 2004.
     

Conferences

  • D. Klonidis, G. Zervas, C.T. Politi, D. Simeonidou, M.J. O’Mahony, “Fast control circuit for a GCSR tunable laser for applications in optical packet switching”, in proc. Networks and Optical Communications NOC, pp.394-400, Darmstadt 2002.
  • Dimitrios Klonidis, Christina (T.) Politi, Dimitra Simeonidou, Michael O’Mahony, “Optical packet switching scheme for high speed routing”, in proc. ECOC 2003, We4.P.99, Rimini, Italy, Sep 2003.
  • Dimitrios Klonidis, Christina (T.) Politi, Michael O’Mahony, Dimitra Simeonidou, “High-speed large-port optical packet router comprising the use of Tunable laser and dual-pump Four Wave Mixing”, in proc. Photonics in Switching 2003, PS.Mo.B2Versailles Paris, France, Oct 2003.
  • Christina (T) Politi, Dimitrios Klonidis, Anna Tzanakaki, Michael O’Mahony, Ioannis Tomkos, “Novel Wavelength Routed Optical CrossConnect Architecture”, in proc. in proc. Photonics in Switching 2003, PS.Th.B4, Versailles Paris, France, Oct 2003.
  • Christina T. Politi, Dimitrios Klonidis, Anna Tzanakaki, Michael O’Mahony, Ioannis Tomkos, “Novel Wavelength/Waveband Cross Connect Architecture based on Optical Wavelength Converters and a Passive Wavelength Router”, in proc. LEOS 2003, MN2, Tucson, (AR) USA, Nov 2003.
  • Reza Nejabati, Dimitrios Klonidis, Dimitra Simeonidou, Michael O’Mahony, “Hybrid Edge IP/Optical Packet Generator in Wavelength Routed Networks”, in proc. OFC 2004, ThV1, Los Angeles, (CA) USA, Mar 2004.
  • Christina (Tanya) Politi, Dimitrios Klonidis, Mike O’Mahony, “Extinction Ratio Regeneration and Pulse Extraction using Four-Wave Mixing in Semiconductor Optical Amplifiers”, in proc., 13P-49, OECC04, Yokohama, Japan 2004.
  • D. Klonidis, C.(T.) Politi, M. O’Mahony, D. Simeonidou “Demonstration and investigation of a novel DPSK-based optical label extraction scheme for high speed optical packet switched networks”, in proc., 14A2-4, OECC04, Yokohama, Japan 2004.
  • Christina (T.) Politi, Dimitrios Klonidis, Anna Tzanakaki, Mike O’Mahony, Ioannis Tomkos, “Demonstration of a Novel Wavelength Routed Optical Packet Switch Architecture”, in proc. 13A2-1, OECC04, Yokohama, Japan 2004.
  • D. Klonidis, C.(T.) Politi, M. O’Mahony, D. Simeonidou, “40Gb/s optical packet switching using dual-pump Four Wave Mixing”, in proc., 15A2-4, OECC04, Yokohama, Japan 2004.
  • D. Klonidis, R. Nejabati, C. (T.) Politi, M. O’Mahony, “All-optical Packet Switching of 40Gb/s Variable Length Packets Using Dual-Pump FWM Controlled by Fast Tunable Laser”, in proc. 30th European Conf. on Optical Comm., Stockholm, Sweden, Th6.1.2, September 2004.
  • Christina (Tanya) Politi, Dimitrios Klonidis, Anna Tzanakaki, Mike O’Mahony, Ioannis Tomkos, “Optical Packet Switch Architecture Using Waveband Routing”, in proc. 30th European Conf. on Optical Comm., Stockholm, Sweden, Th6.1.4, September 2004.
  • Reza Nejabati, Dimitris Klonidis, Dimitra Simeonidou, Mike O’Mahony, “Demonstration of Ingress Edge IP-Optical Packet Router in Wavelength Routed Optical Packet Switched Networks”, in proc. 30th European Conf. on Optical Comm., Stockholm, Sweden, Th6.1.3, September 2004.
  • D. Klonidis, R. Nejabati, C.(T.) Politi, M.J. O’Mahony, D. Simeonidou, “Demonstration of a fully functional and controlled optical packet switch at 40Gb/s”, in proc. 30th European Conf. on Optical Comm., Stockholm, Sweden, PD Th4.4.5, September 2004.
  • R. Nejabati, D. Klonidis, D. Simeonidou, M.J. O’Mahony, “Demonstration of user-controlled network interface for sub-wavelength bandwidth-on-demand services”, in proc. Optical Fibre Communication Conference, OWK2, Anaheim, California, USA March 2005.
  • Reza Nejabati, Dimitrios Klonidis, Dimitra Simeonidou, Mike O’Mahony, “Hybrid IP/Optical Packet Transceiver Mechanism for Wavelength Routed Asynchronous Optical Packet Switched Networks” in proc. 30th European Conf. on Optical Comm., We1.4.3, Glasgow, UK, Sep. 2005.
  • G. Zarris, D. Klonidis, E. Hugues Salas, R. Nejabati, M. O’Mahony, “A simple and robust all-optical circulating buffer and wavelength converter for fast optical packet switching nodes”. in proc. 30th European Conf. on Optical Comm., Th2.4.6, Glasgow, UK, Sep. 2005.
  • D. Klonidis, C.(T.) Politi, R. Nejabati, D. Simeonidou, M. O'Mahony, "Designing a high speed optical packet switched network", in proc. IEEE International Conf. on Transparent Optical Networks ICTON, paper Tu.C1.2, pp. 245-251, Barcelona, Spain, July 2005.
  • D. Klonidis, C.(T.) Politi, E. Dialynas, M.J O’Mahony, D. Simeonidou, A. Poustie, “FWM Wavelength Conversion with Pump Suppression”, in proc. Optical Fibre Communication Conference, JThB35, Anaheim, California, USA Mar. 2006.
  • R. Nejabati, D. Klonidis, G. Zervas, D. Simeonidou, M.J. O’Mahony, “Demonstration of a Complete and Fully Functional End-to-End Asynchronous Optical Packet Switched Network”, in proc. Optical Fibre Communication Conference, OWP5, Anaheim, California, USA March 2006.
  • Afxendios Tychopoulos, Ioannis Papagiannakis, Dimitrios Klonidis, Anna Tzanakaki, Odysseas Koufopavlou, Ioannis Tomkos, “Experimental Evaluation of a Novel Inband FEC Scheme for Low-Cost SDH STM-64 Metro Networks”, in proc. IEEE International Conf. on Transparent Optical Networks ICTON, paper Tu.A3.4, Nottingham, UK, June 2006.

AREAS OF TECHNICAL INTEREST

Optical Packet/Burst Switching
Networking architectures for OPS/OBS applications.
Node design, subsystems and techniques for OPS networks.
Dynamic Grid networking based on OPS/OBS physical layer infrastructure.

Optical Signal Processing
Fast (nanosecond) switching based on wavelength conversion.
Four-Wave-Mixing wavelength conversion for ultra-fast signal processing.
MZI-based all-optical processing schemes and regeneration.
All-optical label processing techniques (DPSK, FSK, OC-based)

High speed optical transmission
Ultra-short pulse sources and compression schemes.
Link optimization for ultra-fast optical signals beyond 100Gb/s.
Transmission properties and impairments.

Node controller design and implementation
Intelligent electronics/optoelectronics for low latency switch control.
Fast tuneable laser controller.
Interfacing with switching subsystems (switch matrices, buffers, regenerators, header processors).

Electronic mitigation of optical transmission impairments
Adaptive filtering and equalisation schemes
Pre- and post compensation schemes
Coding schemes (FEC) to strengthen signal quality against channel impairments

Optical Code based applications, techniques and subsystems.
OCDMA system design and applications in passive metro networks
Optical codes for OPS applications and all-optical label extraction and processing.

PROFESSIONAL MEMBERSHIPS

  • Member of the International Electrical and Electronics Engineering (IEEE) society
  • Member of the Technical Chamber of Greece

 

Last Updated: June 2006