News

Four EMPIR projects feature in an article in Nature Communications publication

Fiber optics

Comparison of geographically separated ultrastable lasers, over the longest ever reported metrological optical fibre link network, measuring 2,220 km

The research from four projects within EURAMET’s European Metrology Programme for Innovation and Research about ultrastable lasers is described in a recent article in the journal Nature Communications.

The four EMPIR projects are:

Abstract from the article

The article entitled Comparing ultrastable lasers at 7 × 10−17 fractional frequency instability through a 2220 km optical fibre network explains what has been achieved in the projects:

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 laser of similar performance, but a suitable system may not be available locally. The article reports a comparison of two geographically separated lasers, over the longest ever reported metrological optical fibre link network, measuring 2,220 km in length, at a state-of-the-art fractional-frequency instability of 7 × 10−17 for averaging times between 30 s and 200 s.

The measurements also allow the short-term instability of the complete optical fibre link network to be directly observed without using a loop-back fibre. Based on the characterisation of the noise in the lasers and optical fibre link network over different timescales, we investigate the potential for disseminating ultrastable light to improve the performance of remote optical clocks

These EMPIR projects are co-funded by the European Union's Horizon 2020 research and innovation programme and the EMPIR Participating States.


Want to hear more about EURAMET?

Sign up for EURAMET newsletters and other information
Follow us on LinkedIn and Twitter

 

Select your area of interest
Partnership Call 2022: Stage 2 OPEN
2022-06-23

The deadline for submission of joint research project proposals is 23:59 CEST on 03 October 2022. more

Don’t miss EMN TraceLabMed’s workshop on the future of nucleic acid metrology!
2022-06-10

23 June 2022, 09:30 – 16:30 CEST, METAS (the National Metrology Institute of Switzerland) more

EMPIR project improves patient safety for MRI scans with implants
2022-06-08

Procedures allowing medical implant manufacturers to demonstrate compliance with MRI safety regulations more

EURAMET projects enable Europe’s first calibration facility for LNG
2022-06-03

Liquid energy gases provide cleaner alternatives to traditional fuels - now Europe has a new calibration facility for these energy sources more

Page 1 of 191.