11th CEF Networks Workshop 2023

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The 11th Customer Empowered Fibre Networks Workshop was held in Prague from April 18th to 19th.

Workshop disseminated knowledge needed for further development of dark fibre footprint and advanced applications for the worldwide Research and Education Community (REC).

The scope of the 11th CEF Networks workshop topics was quite open, presentations were focused on the following topics:

  • Photonic (all-optical) services, spectrum services, spectrum sharing, dark spectrum channels, alien waves, optimal or dynamic usage of transmission spectrum, and virtual fibre networks
  • SDN approach, end to end services for high precision and high bandwidth, performance applications, real-time applications of wide-area all-optical networks
  • Multi-vendor/disaggregated lighting of CEF networks, interoperability and vendor-independent description of transmission systems
  • Dark fibre or channel test-beds and experimental facilities (in campuses, regional, national, or continental) used for experiments and additional production traffic
  • Rapidly developing applications of photonic or dark fibre connectivity (cryptography, metrology, seismology, security, space applications, sensing, sensor networks, etc.)
  • Deployments and testing of high-speed transmission systems, power, and footprint consumption reduction
  • Development of dark fibre footprint used for Research and Education, spectrum sharing, and new types of fibres including acquisition


All participants must be registered.

Registration was closed.

If you have any questions contact Jindřich Kára at jkara@cesnet.cz.

The workshop programme

All programme is in CEST time zone.

Tuesday, April 18th, 2023, 

9.00 Registration starts
10.00 Opening of the 11th CEF Networks workshop
Jakub Papírník, CESNET executieve chief
10.15 CESNET3 optical network and its advanced services 
Josef Vojtěch, CESNET
Artur Binczewski, PSNC
11.20 Quantum networking 
12.00 Buffet lunch
13.00 ESnet6 overview and the QUANT-NET project 
Inder Monga, ESNET
13.45 Network evolution GARR-T: Current and future development
Gloria Vuagnin/Paolo Bolletta, GARR
14.15 Tea and coffee break
14.45 Data Center Interconnection over Spectrum Sharing
Matteo Colantonio, GARR
15.15 Connecting the North: how Brazilians are building large scale shared subfluvial fibre optic infrastructure with service operator neutralitydownload
Michael Stanton/Eduardo Grizendi, RNP
15.45 Adding T&F signals to existing DWDM systems
Fabian Mauchle/Felix Kugler, SWITCH
16.15 End of presentations, discussion
17.00 CESNET’s Optical Lab Tour
19.00 Dinner

Wednesday, April 19th, 2023

9.00 Free consultations
09.30 Coherent migration of Legacy 1G and 10G services remote presentation
Tim Rayner, AARNET
10.00 SUBMERSE project: monitoring submarine cables
Chris Atherton/Guy Roberts, GEANT
10.30 Enabling the deployed fiber communication infrastructure for future sensing services
Kurosh Bozorgebrahimi, Sikt
11.00 Tea and coffee break
11.30 QKD Development Projects
Elisabeth Adriantsarazo, CESNET
12.00 CWDM / DWDM / C+DWDM boxes with fixed wavelength optics in user equipment, and the nms-controlled countrywise wdm (Ribbon / ECI) download
Jan Ferré, DeIC
12.30 Buffet lunch
13.30 ACOnet’s fibre backbone renewal and support for QCI projects
Kurt Bauer/Christian Panigl, ACOnet
14.00 Update on optical research in the GEANT network: QKD deployment, 400G ZR+ pluggables, and Time/frequency services – download
Guy Roberts/Karel van Klink, GEANT
14.30 Tea and coffee break
15.00 Optical footprint of KREONET/KREONet2 improvement and other research and development activities – download
Buseong Cho, KREONET
15.30 EISCAT_3D and spectrum sharing
Jani Myyry, FUNET
16.00 High speed Nyquist-subcarriers coherent signals and so called legacy optical networks
Jan Radil, CESNET
16.30 Discussion and Workshop Recommendations
17.30 Closing of 11th CEF Networks workshop



Vienna House Andel’s Prague

Stroupeznickeho 21. 150 00 Prague

How to get there

The venue: ANDEL´S, a hotel with conference halls, and modern premises. There are large shopping center premises nearby, services and restaurants, etc. Easily reachable by Prague´s public transportation system, Metro station “Andel” is very near the place.

How to get there:

First, you have to buy a general public transport ticket directly at the airport, there are more possibilities, see https://www.dpp.cz/en/fares/fare-pricelist . A simple paper version can be bought in yellow vending machines there; do not forget to stamp it inside the bus.

From the airport:

Bus no. 119 (the stop is right outside, in front of the middle of the arrival hall, just walk straight and look for the signs) the bus will take you to the Metro station “Nadrazi Veleslavin” (15 minutes). Bus 119 ends there, no need for stress. Then, change to Metro (subway) and go 6 stations (in the direction mentioned in the signs as “Depo Hostivar”) to the station “Můstek” (10 minutes) where you have to change to line B (follow the yellow colour signs for changing). Then, go 3 stops to the station  “Anděl”  (6 minutes). There are two exits out of the metro station there, so the shorter way to the venue is to go direction mentioned as “Anděl”. And there, the venue is, just round the corner, 300 meters from the exit. Good luck!

From anywhere else:

Use the subway (Metro). By any line go, and change to line B (yellow) and get to the station “Anděl” and then, see above.

You can also use trams or buses to get there. If a taxi is used from any place, it is recommended to ask them for the expected final price before you start the journey with them.

Enjoy the journey!

Accommodation tips

We can recommend the following accommodation options for the participants of the workshop. All hotels are located nearby the workshop venue.

We have no contracts with the hotels below. Feel free to use booking.com or any other generic accommodation website to find a hotel suitable to your preferences.

Venue or very close to the venue:

At Dejvice, close to the CESNET headquarters:

Previous CEF Networks Workshops

2019, 2017, 2014, 2012, 2010, 2009, 2007, 2006, 2005, 2004

Last change: 15.5.2023