A5090529653- Advanced Frequency and Time Standards
- Advanced Fiber Laser Technologies
- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Subatomic Physics Research
- Semiconductor Lasers and Optical Devices
- Advanced Photonic Communication Systems
- Optical Network Technologies
- Quantum optics and atomic interactions
- Network Time Synchronization Technologies
- Cardiovascular Syncope and Autonomic Disorders
- Geophysics and Sensor Technology
- Advanced Fiber Optic Sensors
- Non-Invasive Vital Sign Monitoring
- Advanced Optical Network Technologies
- Advanced Electrical Measurement Techniques
- Spectroscopy and Laser Applications
Renater
2016-2024
Université Sorbonne Paris Nord
2014-2020
Sorbonne Paris Cité
2016-2020
Université Paris Cité
2014-2020
Centre National de la Recherche Scientifique
2014-2020
Laboratoire de physique des lasers
2015-2020
Abstract Leveraging the unrivalled performance of optical clocks as key tools for geo-science, astronomy and fundamental physics beyond standard model requires comparing frequency distant faithfully. Here, we report on comparison agreement two strontium at an uncertainty 5 × 10 −17 via a newly established phase-coherent link connecting Paris Braunschweig using 1,415 km telecom fibre. The remote is limited only by instability lattice themselves, with negligible contributions from transfer. A...
Phase compensated optical fiber links enable high accuracy atomic clocks separated by thousands of kilometers to be compared with unprecedented statistical resolution. By searching for a daily variation the frequency difference between four strontium lattice in different locations throughout Europe connected such links, we improve upon previous tests time dilation predicted special relativity. We obtain constraint on Robertson--Mansouri--Sexl parameter $|\alpha|\lesssim 1.1 \times10^{-8}$...
We search for transient variations of the fine structure constant using data from a European network fiber-linked optical atomic clocks. By searching coherent in recorded clock frequency comparisons across network, we significantly improve constraints on constant. For example, constrain variation alpha to <5*10^-17 transients duration 10^3 s. This analysis also presents possibility dark matter, mysterious substance hypothesised explain galaxy dynamics and other astrophysical phenomena that...
Abstract Ultrastable lasers are essential tools in optical frequency metrology enabling unprecedented measurement precision that impacts on fields such as atomic timekeeping, tests of fundamental physics, and geodesy. To characterise an ultrastable laser it needs to be compared with a similar performance, but suitable system may not available locally. Here, we report comparison two geographically separated lasers, over the longest ever reported metrological fibre link network, measuring 2220...
We report a cascaded optical link of 1100 km for ultra-stable frequency distribution over an Internet fiber network.The is composed four spans which the propagation noise actively compensated.The robustness and performance are ensured by five fully automated optoelectronic stations, two them at ends, three deployed on field connecting spans.This device coherently regenerates signal with heterodyne phase locking low-noise laser diode.Optical detection beat-note signals lock compensation...
We report on the first comparison of distant caesium fountain primary frequency standards (PFSs) via an optical fiber link. The 1415 km long link connects two PFSs at LNE-SYRTE (Laboratoire National de métrologie et d'Essais—SYstème Références Temps-Espace) in Paris (France) with PTB (Physikalisch-Technische Bundesanstalt) Braunschweig (Germany). For a time, these have been major contributors to accuracy International Atomic Time (TAI), stated accuracies around . They also references for...
We report on a fully bi-directional 680~km fiber link connecting two cities for which the equipment, set up and characterization are managed first time by an industrial consortium. The uses active telecommunication network with parallel data traffic is equipped three repeater laser stations four remote double Erbium-doped amplifiers. short term stability at 1~s integration of $5.4\times 10^{-16}$ in 0.5~Hz bandwidth long $1.7\times10^{-20}$ 65\,000 s time. accuracy frequency transfer...
Abstract We investigate optical frequency dissemination over a 1400 km long fiber link in looped configuration pair of underground fibers between Braunschweig and Strasbourg. This is the first to combine Brillouin amplifiers with repeater laser station. Phase-coherent operation more than five days demonstrated. analyze repeatability performance four campaigns present results 65 d total. The weighted mean fractional offset transferred complete data set (−1.1 ± 0.4)×10 –20 . By analyzing...
Abstract We present the development and current status of REFIMEVE national research infrastructure, which disseminates time frequency reference signals generated at LNE-SYRTE to labs all over France. Using mainly optical fiber backbone RENATER, French National Research Education Network, currently provides an around 15 labs, connection points Germany, UK, Italy Switzerland. The robustness various types equipment specifically developed for transfer ultrastable frequencies efficient...
High-resolution time and frequency transfer between remote laboratories are of major interest for many fundamentals applications, such as tests general relativity or temporal variation fundamental constants performed by comparing clocks signals. We report on the progress a metrological fiber network French territory, with extensions to Europe, which aims provide an ultra-stable signal around 20 laboratories. This is based dissemination using optical links through academic internet network....
Methods for long-distance time and frequency transfer over optical fibres have demonstrated excellent performances are evolving rapidly. CLONETS is a new European Union-funded coordination support action intended to accelerate the of these technologies industry strengthen between research infrastructures education network providers, in order prepare deployment this technology sustainable, pan-European fibre network, providing high-performance clock services supporting wider society.
We present our work on realizing two-branch fiber links enabling multiple-partner clock comparisons in Europe. report detail the setup connecting two long haul links, and for relative frequency stability accuracy. a combined uptime of 90% dual-branch link during almost one month. finally discuss uncertainty contribution ensemble architecture to comparison. show that transfer is 2 x 10 --19 .
Methods for long-distance time and frequency transfer over optical fibres have demonstrated excellent performances are evolving rapidly. CLONETS is a new European Union-funded coordination support action intended to accelerate the of these technologies industry strengthen between research infrastructures education network providers, in order prepare deployment this technology sustainable, pan-European fibre network, providing high-performance clock services supporting wider society.
The transfer of ultra-stable frequencies between distant laboratories is required by many applications in time and frequency metrology, fundamental physics, particle accelerators astrophysics. Optical fiber links have been intensively studied for a decade brought the potential to with very high accuracy stability thanks an active compensation propagation noise. We are currently developing optical metrological network using fibers French National Research Education Network. Using so-called...
We report on the progresses of REFIMEVE, French fiber network for optical frequency dissemination and comparison. present originality strengths approach promoted by RENATER to allow propagation bi-directional signals in parallel data traffic an active operational network. show, first time best our knowledge, simultaneous standard into 3 branches a 2×1300 km telecom Performances are at state art, availability signal is typically >96% over 25 days continuous operation.
SummaryWe report the performance of REFIMEVE, a national metrological network optical fiber links, using academic network. It enables coherent dissemination time and/or frequency reference signals from LNE-SYRTE to around 15 labs and more than 30 in future. We will show latest extensions Paris urban area all over France, architecture required for such al network, progress terms robustness uptime. also present some applications precision measurements, particular ultra-high-resolution...
Time and frequency transfer based on optical fiber links techniques have demonstrated excellent performances. CLONETS is EU project intended to accelerate of related technologies, in order prepare deployment technology for sustainable network providing high-performance clock services.
Methods for long-distance time and frequency transfer over optical fibers have demonstrated excellent performances are evolving rapidly. CLONETS is a European Union-funded coordination support action intended to facilitate the vision of sustainable, pan-European fiber network precise reference dissemination. © 2019 The Author(s)
Dynamic development of long-distance methods time and frequency signals transmission over optical fibers is giving the opportunity to create network with dedicated clock services. In order prepare deployment this technology for a sustainable, pan-European fibre network, providing high-performance services European research infrastructures supporting wider industry society, CLONETS project, funded by Commission in H2020 program, coordination support action intended accelerate transfer these...
Long-distance time and frequency transfer methods based on optical fibre links have evolved rapidly in recent years, demonstrating excellent performance for considerable promise accurate transfer. CLONETS-DS is a European Union-funded research innovation action intended to facilitate the vision of sustainable, pan-European network precise reference dissemination.
Long-distance time and frequency transfer methods based on optical fibre links have evolved rapidly in recent years, demonstrating excellent performance for considerable promise accurate transfer. Optical links, besides provisioning extreme data rates, are attractive both very high-performance applications such as clock comparisons, basic research or relativistic geodesy, but also many industrial societal applications, they complement offer an alternative to radio- satellite-based methods....
We are currently developing a cascaded optical frequency link between Paris and Strasbourg using the French National Research Education Network RENATER. The ultrastable signal is copropagating with data traffic wavelength division multiplexing. have developed some repeater stations to amplify filter each sections of compensate propagation noise. remote operation these key element for deployment reliable large scale metrological network. report on first implementation such station 540-km...