Square Kilometre Array Telescope--Precision Reference Frequency Synchronisation via 1f-2f Dissemination

Scientific Reports
B WangL J Wang

Abstract

The Square Kilometre Array (SKA) project is an international effort to build the world's largest radio telescope, with a one-square-kilometre collecting area. In addition to its ambitious scientific objectives, such as probing cosmic dawn and the cradle of life, the SKA demands several revolutionary technological breakthroughs, such as ultra-high precision synchronisation of the frequency references for thousands of antennas. In this report, with the purpose of application to the SKA, we demonstrate a frequency reference dissemination and synchronisation scheme in which the phase-noise compensation function is applied at the client site. Hence, one central hub can be linked to a large number of client sites, thus forming a star-shaped topology. As a performance test, a 100-MHz reference frequency signal from a hydrogen maser (H-maser) clock is disseminated and recovered at two remote sites. The phase-noise characteristics of the recovered reference frequency signal coincide with those of the H-maser source and satisfy the SKA requirements.

References

May 20, 2005·Nature·Masao TakamotoHidetoshi Katori
Apr 7, 2010·Physical Review Letters·C W ChouT Rosenband
Sep 22, 2011·Optics Express·Miho FujiedaTetsuya Ido
Nov 21, 2012·Optics Letters·C GaoL J Wang
Aug 24, 2013·Science·N HinkleyA D Ludlow
Aug 31, 2013·Optics Letters·Y BaiL J Wang
Nov 5, 2013·The Review of Scientific Instruments·J MiaoL J Wang
Mar 25, 2014·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Przemyslaw KrehlikMarcin Lipiński

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Citations

Aug 1, 2020·Optics Letters·Liang HuJianping Chen
Mar 4, 2020·Optics Express·Hongwei SiLijun Wang
Jul 3, 2020·The Review of Scientific Instruments·Ying LiuJianping Chen
Nov 12, 2020·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Shukree WassinTim Gibbon
May 14, 2021·Applied Optics·Shouhua HuangAndrey Matsko
Jul 11, 2021·The Review of Scientific Instruments·Liang HuJianping Chen

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