| Title: |
Automated Simultaneous Precise Time Calibration of White Rabbit Switches for REFIMEVE |
| Authors: |
Yadav, Neelam; Tuckey, Philip; Abgrall, Michel; Amy-Klein, Anne; Chardonnet, Christian; Pottie, Paul-Éric |
| Contributors: |
Laboratoire Temps Espace (LTE); Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris; Centre National de la Recherche Scientifique (CNRS)-Université Paris Sciences et Lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Sciences et Lettres (PSL)-Université de Lille-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Laboratoire National de Métrologie et d’Essais (LNE); Laboratoire de Physique des Lasers (LPL); Université Paris 13 (UP13)-Centre National de la Recherche Scientifique (CNRS)-Université Sorbonne Paris Nord |
| Source: |
First-TF Annual Meeting 2025, Workshop "Application of Time-Frequency technologies to defence and space". ; https://hal.science/hal-05500940 ; First-TF Annual Meeting 2025, Workshop "Application of Time-Frequency technologies to defence and space"., Oct 2025, Campus Beaulieu - Rennes University, Rennes, France |
| Publisher Information: |
CCSD |
| Publication Year: |
2025 |
| Collection: |
Université Paris 13: HAL |
| Subject Terms: |
and Optical Fibre Network; Time and Frequency Transfer; Instrumental Delays Calibration; White Rabbit Switch (WRS); [PHYS]Physics [physics] |
| Subject Geographic: |
Campus Beaulieu - Rennes University; Rennes; France |
| Description: |
International audience ; Precise time and frequency signals are required for numerous applications including advanced scientific research such as High energy physics, Astronomy, Quantum telecommunications etc. In France, the national research infrastructure REFIMEVE distributes ultra-stable optical frequency reference signals over long distances for scientific applications. The reference signals are generated by the designated institute for time and frequency, LNE-OP, at Observatoire de Paris/LTE. They are distributed over the fiber-optic network of the national research and education network, RENATER, using bidirectional links over dark channels. REFIMEVE currently connects more than 30 research laboratories across France, and is also connected via cross-border links to National Physical Laboratory (NPL, UK), Physikalisch-Technische Bundesanstalt (PTB, Germany), Istituto Nazionale di Ricerca Metrologica (INRiM, Italy) and European Organization for Nuclear Research (CERN, Switzerland). In near future the network is planned to be extended to connect more than 40 French laboratories. T-REFIMEVE is a new and ongoing component of REFIMEVE, one major objective of which is to add time and microwave frequency references to the signals which are distributed, through the addition of a White Rabbit (WR) network to the infrastructure. We aim to achieve 10 ns-level time transfer accuracy over more than 80 interconnected WR nodes, over the 5000 km optical fiber network. The WR signals are transmitted as alien wavelengths on RENATER’s fibre network, using standard xWDM technology including unidirectional amplifiers, i.e. using unidirectional links. This introduces the challenge of compensating for the optical path asymmetries inherent to unidirectional links.A first key requirement of T-REFIMEVE is the accurate calibration of the instrumental delays of the White Rabbit Switches (WRS). This poster presents the calibration of dozens of WRS at LTE. We set up an independent calibration chain for T-REFIMEVE, based on ... |
| Document Type: |
conference object; still image |
| Language: |
English |
| Availability: |
https://hal.science/hal-05500940; https://hal.science/hal-05500940v1/document; https://hal.science/hal-05500940v1/file/Neelam_First_TF-2025%20Poster.pdf |
| Rights: |
https://hal.science/licences/copyright/ ; info:eu-repo/semantics/OpenAccess |
| Accession Number: |
edsbas.417424FE |
| Database: |
BASE |