期刊
APPLIED PHYSICS B-LASERS AND OPTICS
卷 117, 期 3, 页码 979-986出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00340-014-5917-8
关键词
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资金
- Italian Ministry of Research MIUR under the Progetti Premiali programme
- Italian Ministry of Research MIUR [PRIN09-2009ZJJBLX]
- Metrology Research Programme (EMRP) [SIB-02 NEAT-FT]
- EMRP within EURAMET
- European Union
To significantly improve the frequency references used in radio-astronomy and the precision measurements in atomic physics, we provide frequency dissemination through a 642-km coherent optical fiber link. On the frequency transfer, we obtained a frequency instability of 3 x 10(-19) at 1,000 s in terms of Allan deviation on a 5-mHz measurement bandwidth, and an accuracy of 5 x 10(-19). The ultimate link performance has been evaluated by doubling the link to 1,284 km, demonstrating a new characterization technique based on the double round trip on a single fiber. This method is an alternative to previously demonstrated techniques for link characterization. In particular, the use of a single fiber may be beneficial to long hauls realizations in view of a continental fiber network for frequency and time metrology, as it avoids the doubling of the amplifiers, with a subsequent reduction in costs and maintenance. A detailed analysis of the results is presented, regarding the phase noise, the cycle-slips detection and removal and the instability evaluation. The observed noise power spectrum is seldom found in the literature; hence, the expression of the Allan deviation is theoretically derived and the results confirm the expectations.
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