Time Transfer between UTC(SP) and UTC(MIKE) Using Frame Detection in Fiber-Optical Communication networks
Paper i proceeding, 2011

This paper presents recent results from a time transfer method using passive listening and detection of SDH frame headers in fiber-optical networks. The results are based on an experimental fiber-link that is implemented between the national time and frequency laboratories at SP in Borås, Sweden and at MIKES in Espoo, Finland with an intermediate connection at STUPI time and frequency facility in Stockholm, Sweden. The total fiber length exceeds 1129 km and is implemented in SUNET (Swedish University Network) and FUNET (Finnish University and Research Network). The two networks are connected via NORDUnet (Nordic Infrastructure for Research & Education) and the links are DWDM-based (Dense Wavelength Division Multiplexing). Both SP and MIKES maintains local representations of UTC and contributes with clock data to TAI, which gives the opportunity to compare the fiber-based method with those independent methods that are used regularly by the laboratories for the links to UTC. Preliminary results show that a time transfer stability of less than 10 picoseconds is obtained for averaging times of a few hundred seconds. The results also show that the method suffers from daily variations of a few nanoseconds, presumable due to temperature sensitive network equipment and asymmetric fiber paths. Nevertheless, a comparison to GPS carrier phase time transfer over three months shows an rms-agreement of less than 1 nanosecond.

Författare

Sven-Christian Ebenhag

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

R. T. Kenneth Jaldehag

Chalmers

SP Sveriges Tekniska Forskningsinstitut AB

Carsten Rieck

Chalmers, Rymd- och geovetenskap, Onsala rymdobservatorium

Per O. J. Jarlemark

SP Sveriges Tekniska Forskningsinstitut AB

Chalmers

Per Olof E Hedekvist

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

Peter Löthberg

STUPI LLC

SP Sveriges Tekniska Forskningsinstitut AB

Thomas Fordell

SP Sveriges Tekniska Forskningsinstitut AB

Centre for Metrology and Accreditation Finland

Mikko Merimaa

SP Sveriges Tekniska Forskningsinstitut AB

Centre for Metrology and Accreditation Finland

43rd Precise Time and Time Interval (PTTI) Systems and Applications Meeting

431-441

Ämneskategorier

Annan teknik

Elektroteknik och elektronik

Nanoteknik

ISBN

978-162276795-3

Mer information

Senast uppdaterat

2018-09-10