Journal
APPLIED PHYSICS B-LASERS AND OPTICS
Volume 123, Issue 5, Pages -Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00340-017-6736-5
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Funding
- EC [605243]
- European Metrological Research Programme EMRP [SIB-02 NEAT-FT]
- EMRP within EURAMET
- European Union
- Korea Research Institute of Standards and Science [16011007]
- R&D Convergence Program of NST (National Research Council of Science and Technology) of Republic of Korea [CAP-15-08-KRISS]
- National Research Council of Science & Technology (NST), Republic of Korea [CAP-15-08-KRISS] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We present the experimental demonstration of a local two-way optical frequency comparison over a 43-km-long urban fiber network without any requirement for measurement synchronization. We combined the local two-way scheme with a regular active noise compensation scheme that was implemented on another parallel fiber leading to a highly reliable and robust frequency transfer. This hybrid scheme allowed us to investigate the major limiting factors of the local two-way comparison. We analyzed the contributions of the interferometers at both local and remote locations to the phase noise of the local two-way signal. Using the ability of this setup to be injected by either a single laser or two independent lasers, we measured the contributions of the demodulated laser instabilities to the long-term instability. We show that a fractional frequency instability level of 10(-20) at 10,000 s can be obtained using this simple setup after propagation over a distance of 43 km in an urban area.
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