Coherent optical frequency transfer at 5e-19 over a doubled 642 km fiber link

Abstract

To significantly improve the frequency references used in radio-astronomy and precision measurements in atomic physics, we provide frequency dissemination through a 642 km coherent optical fiber link, that will be also part of a forthcoming European network of optical links. We obtained a resolution of 3e-19 at 1000 s on the frequency transfer, and an accuracy of 5e-19. The ultimate link performance has been evaluated by doubling the link to 1284 km, demonstrating a new characterization technique based on the double round-trip on a single fiber. The arming of a second fiber is avoided: this is beneficial to long hauls realizations in view of a continental fiber network for frequency and time metrology. The data analysis is based on the Allan deviation; its expression is theoretically derived for the observed noise power spectrum, which is seldom found in the literature.

References in corpus (11)

• An Optical Lattice Clock with Accuracy and Stability at the $10^{-18}$ Level
• Simultaneous remote transfer of accurate timing and optical frequency over a public fiber network
• Ultra-stable long distance optical frequency distribution using the Internet fiber network
• Measuring the frequency of a Sr optical lattice clock using a 120-km coherent optical transfer
• Frequency transfer via a two-way optical phase comparison on a multiplexed fiber network
• All-optical link for direct comparison of distant optical clocks
• Eavesdropping time and frequency: phase noise cancellation along a time-varying path, such as an optical fiber
• Phase- coherent comparison of two optical frequency standards over 146 km using a telecommunication fiber link
• In-line extraction of an ultra-stable frequency signal over an optical fiber link
• Planar-Waveguide External Cavity Laser Stabilization for an Optical Link with 1E-19 Frequency Stability
• Distributed Raman optical amplification in phase coherent transfer of optical frequencies

Cited by in corpus (44)

• Geodesy and metrology with a transportable optical clock
• Synthetic dimensions and spin-orbit coupling with an optical clock transition
• Atomic Clocks for Geodesy
• Real-time geopotentiometry with synchronously linked optical lattice clocks
• A transportable optical lattice clock with $7\times 10^{-17}$ uncertainty
• A high-performance optical lattice clock based on bosonic atoms
• Fully phase-stabilized quantum cascade laser frequency comb
• A transportable strontium optical lattice clock
• Brillouin amplification supports $1\times 10^{-20}$ accuracy in optical frequency transfer over 1400~km of underground fibre
• Cascaded optical fiber link using the Internet network for remote clocks comparison
• Frequency ratios of Sr, Yb and Hg based optical lattice clocks and their applications
• Two-Way Optical Frequency Comparisons Over 100km Telecommunication Network Fibers
• Tackling the Limits of Optical Fiber Links
• Fibre-optic delivery of time and frequency to VLBI station
• Optically synchronized fiber links with spectrally pure integrated lasers
• Hybrid fiber links for accurate optical frequency comparisons
• Time shifting deviation method enhanced laser interferometry: ultrahigh precision localizing of traffic vibration using urban fiber link
• Measuring absolute frequencies beyond the GPS limit via long-haul optical frequency dissemination
• SI-traceable frequency dissemination at 1572.06 nm in a stabilized fiber network with ring topology
• Combining fiber Brillouin amplification with a repeater laser station for fiber-based optical frequency dissemination over 1400 km
• Passive Optical Phase Noise Cancellation
• Characterization of a 450-km Baseline GPS Carrier-Phase Link using an Optical Fiber Link
• Beyond the fundamental noise limit in coherent optical fiber links
• Ultra-stable optical frequency dissemination on a multi-access fibre network
• Branching optical frequency transfer with enhanced post automatic phase noise cancellation
• Time-Frequency Transfer over Optical Fiber
• Multi-node optical frequency dissemination with post automatic phase correction
• A compact ultranarrow high-power laser system for experiments with 578nm Ytterbium clock transition
• Passive Optical Phase Stabilization on a Ring Fiber Network
• Digital Doppler-cancellation servo for ultra-stable optical frequency dissemination over fiber
• Fully digital platform for local ultra-stable optical frequency distribution
• Laser spectroscopy of cold molecules
• Characterization of Optical Frequency Transfer Over 154 km of Aerial Fiber
• Universal formalism for data sharing and processing in clock comparison networks
• Real-time free-running time scale with remote clocks on fiber-based frequency network
• Phase noise cancellation in polarisation-maintaining fibre links
• Fundamental Physics in 2025: Status, Decisive Targets, and Path Forward
• Robust optical frequency transfer in a noisy urban fiber network
• E-21 Level Instability Frequency Dissemination over 2067 km noisy Telecommunication Infrastructure
• Evaluating Optical Fiber Links with Data Filtering and Allan Deviation
• Efficient laser noise reduction by locking to an actively stabilized fiber interferometer with 10 km arm imbalance
• Evaluation at the Remote Site for Ultra-stable Radio Frequency Dissemination via Fiber Links
• The correlation of co-located hydrogen masers
• Avoiding Aliasing in Allan Variance: an Application to Fiber Link Data Analysis