In-line extraction of an ultra-stable frequency signal over an optical fiber link

Abstract

We demonstrate in-line extraction of an ultra-stable frequency signal over an optical link of 92-km of installed telecommunication fibers, following the proposition of G. Grosche in 2010. We show that the residual frequency noise at the extraction end is noticeably below that at the main link output when the extraction is near the input end, as expected from a simple model of the noise compensation. We obtain relative frequency instabilities, expressed as overlapping Allan deviation, of 8x10-16 at 1 s averaging time and a few 10-19 at 1 day. These results are at the state-of-the-art for a link using urban telecommunication fibers. We also propose an improved scheme which delivers an ultra-stable signal of higher power, in order to feed a secondary link. In-line extraction opens the way to a broad distribution of an ultra-stable frequency reference, enabling a wide range of applications beyond metrology.

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• Tackling the Limits of Optical Fiber Links
• Joint time and frequency dissemination network over delay-stabilized fiber optic links
• 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
• All-passive multiple-place optical phase noise cancellation
• Ultra-stable optical frequency dissemination on a multi-access fibre network
• Multi-node optical frequency dissemination with post automatic phase correction
• Passive Optical Phase Stabilization on a Ring Fiber Network
• Multiple-access relay stations for long-haul fiber-optic radio frequency transfer
• Square Kilometer Array Telescope - Precision Reference Frequency Synchronisation via 1f-2f Dissemination
• Fundamental Limitations of Rayleigh Backscattering Noise on Fiber-Based Multiple-Access Optical Frequency Transfer
• Chirped Frequency Transfer with an accuracy of $10^{-18}$ and its Application to the Remote Synchronisation of Timescales
• E-21 Level Instability Frequency Dissemination over 2067 km noisy Telecommunication Infrastructure